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SCHEDULE III REAL ESTATE AND RELATED DEPRECIATION (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
sqft
Dec. 31, 2013
Dec. 31, 2012
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 28,621,742us-gaap_AreaOfRealEstateProperty    
Initial cost      
Land $ 524,475us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand    
Building and Improvements 2,303,584us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements    
Costs Subsequent to Acquisition 221,302cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition    
Gross Carrying Amount at year end      
Land 545,393us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand    
Building and Improvements 2,304,653us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements    
Total 2,850,046cube_RealEstateAndAccumulatedDepreciationCarryingAmount    
Total 3,117,198us-gaap_RealEstateGrossAtCarryingValue 2,553,706us-gaap_RealEstateGrossAtCarryingValue 2,443,022us-gaap_RealEstateGrossAtCarryingValue
Accumulated Depreciation 398,496cube_RealEstateAndAccumulatedDepreciation    
Minimum      
Gross Carrying Amount at year end      
Estimated useful lives 5 years    
Maximum      
Gross Carrying Amount at year end      
Estimated useful lives 39 years    
YSI 20      
REAL ESTATE AND RELATED DEPRECIATION      
Encumbrances 54,091us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ cube_MortgageLoansOnRealEstateByPortfolioAxis
= cube_YSI20LoanMember
   
YSI 33      
REAL ESTATE AND RELATED DEPRECIATION      
Encumbrances 10,429us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ cube_MortgageLoansOnRealEstateByPortfolioAxis
= cube_YSI33LoanMember
   
Chandler I, AZ      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 47,520us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ChandlerIAZMember
   
Initial cost      
Land 327us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ChandlerIAZMember
   
Building and Improvements 1,257us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ChandlerIAZMember
   
Costs Subsequent to Acquisition 271cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ChandlerIAZMember
   
Gross Carrying Amount at year end      
Land 327us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ChandlerIAZMember
   
Building and Improvements 1,353us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ChandlerIAZMember
   
Total 1,680cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ChandlerIAZMember
   
Accumulated Depreciation 421cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ChandlerIAZMember
   
Chandler II, AZ      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 83,819us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ChandlerIIAZMember
   
Initial cost      
Land 1,518us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ChandlerIIAZMember
   
Building and Improvements 7,485us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ChandlerIIAZMember
   
Costs Subsequent to Acquisition 12cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ChandlerIIAZMember
   
Gross Carrying Amount at year end      
Land 1,518us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ChandlerIIAZMember
   
Building and Improvements 7,496us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ChandlerIIAZMember
   
Total 9,014cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ChandlerIIAZMember
   
Accumulated Depreciation 474cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ChandlerIIAZMember
   
Gilbert, AZ      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 57,380us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_GilbertAZMember
   
Initial cost      
Land 951us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_GilbertAZMember
   
Building and Improvements 4,688us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_GilbertAZMember
   
Costs Subsequent to Acquisition 11cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_GilbertAZMember
   
Gross Carrying Amount at year end      
Land 951us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_GilbertAZMember
   
Building and Improvements 4,699us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_GilbertAZMember
   
Total 5,650cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_GilbertAZMember
   
Accumulated Depreciation 1,305cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_GilbertAZMember
   
Glendale, AZ      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 56,807us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_GlendaleAZMember
   
Initial cost      
Land 201us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_GlendaleAZMember
   
Building and Improvements 2,265us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_GlendaleAZMember
   
Costs Subsequent to Acquisition 1,010cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_GlendaleAZMember
   
Gross Carrying Amount at year end      
Land 418us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_GlendaleAZMember
   
Building and Improvements 2,725us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_GlendaleAZMember
   
Total 3,143cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_GlendaleAZMember
   
Accumulated Depreciation 1,249cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_GlendaleAZMember
   
Green Valley, AZ      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 25,050us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_GreenValleyAZMember
   
Initial cost      
Land 298us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_GreenValleyAZMember
   
Building and Improvements 1,153us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_GreenValleyAZMember
   
Costs Subsequent to Acquisition 132cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_GreenValleyAZMember
   
Gross Carrying Amount at year end      
Land 298us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_GreenValleyAZMember
   
Building and Improvements 1,075us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_GreenValleyAZMember
   
Total 1,373cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_GreenValleyAZMember
   
Accumulated Depreciation 297cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_GreenValleyAZMember
   
Mesa I, AZ      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 52,575us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MesaIAZMember
   
Initial cost      
Land 920us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MesaIAZMember
   
Building and Improvements 2,739us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MesaIAZMember
   
Costs Subsequent to Acquisition 176cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MesaIAZMember
   
Gross Carrying Amount at year end      
Land 921us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MesaIAZMember
   
Building and Improvements 2,469us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MesaIAZMember
   
Total 3,390cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MesaIAZMember
   
Accumulated Depreciation 690cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MesaIAZMember
   
Mesa II, AZ      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 45,511us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MesaIIAZMember
   
Initial cost      
Land 731us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MesaIIAZMember
   
Building and Improvements 2,176us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MesaIIAZMember
   
Costs Subsequent to Acquisition 189cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MesaIIAZMember
   
Gross Carrying Amount at year end      
Land 731us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MesaIIAZMember
   
Building and Improvements 2,048us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MesaIIAZMember
   
Total 2,779cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MesaIIAZMember
   
Accumulated Depreciation 566cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MesaIIAZMember
   
Mesa III, AZ      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 58,264us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MesaIIIAZMember
   
Initial cost      
Land 706us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MesaIIIAZMember
   
Building and Improvements 2,101us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MesaIIIAZMember
   
Costs Subsequent to Acquisition 182cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MesaIIIAZMember
   
Gross Carrying Amount at year end      
Land 706us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MesaIIIAZMember
   
Building and Improvements 1,899us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MesaIIIAZMember
   
Total 2,605cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MesaIIIAZMember
   
Accumulated Depreciation 538cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MesaIIIAZMember
   
Phoenix I, AZ      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 100,775us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PhoenixIAZMember
   
Initial cost      
Land 1,134us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PhoenixIAZMember
   
Building and Improvements 3,376us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PhoenixIAZMember
   
Costs Subsequent to Acquisition 348cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PhoenixIAZMember
   
Gross Carrying Amount at year end      
Land 1,135us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PhoenixIAZMember
   
Building and Improvements 3,075us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PhoenixIAZMember
   
Total 4,210cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PhoenixIAZMember
   
Accumulated Depreciation 870cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PhoenixIAZMember
   
Phoenix II, AZ      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 83,160us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PhoenixIIAZMember
   
Initial cost      
Land 756us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PhoenixIIAZMember
   
Building and Improvements 2,251us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PhoenixIIAZMember
   
Costs Subsequent to Acquisition 1,554cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PhoenixIIAZMember
   
Gross Carrying Amount at year end      
Land 847us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PhoenixIIAZMember
   
Building and Improvements 3,109us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PhoenixIIAZMember
   
Total 3,956cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PhoenixIIAZMember
   
Accumulated Depreciation 712cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PhoenixIIAZMember
   
Phoenix III, AZ      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 121,761us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PhoenixIIIAzMember
   
Initial cost      
Land 2,115us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PhoenixIIIAzMember
   
Building and Improvements 10,429us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PhoenixIIIAzMember
   
Costs Subsequent to Acquisition 24cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PhoenixIIIAzMember
   
Gross Carrying Amount at year end      
Land 2,115us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PhoenixIIIAzMember
   
Building and Improvements 10,453us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PhoenixIIIAzMember
   
Total 12,568cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PhoenixIIIAzMember
   
Accumulated Depreciation 83cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PhoenixIIIAzMember
   
Scottsdale, AZ      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 79,525us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ScottsdaleAZMember
   
Initial cost      
Land 443us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ScottsdaleAZMember
   
Building and Improvements 4,879us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ScottsdaleAZMember
   
Costs Subsequent to Acquisition 1,698cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ScottsdaleAZMember
   
Gross Carrying Amount at year end      
Land 883us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ScottsdaleAZMember
   
Building and Improvements 5,475us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ScottsdaleAZMember
   
Total 6,358cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ScottsdaleAZMember
   
Accumulated Depreciation 2,499cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ScottsdaleAZMember
   
Tempe I, AZ      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 53,890us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TempeIAZMember
   
Initial cost      
Land 749us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TempeIAZMember
   
Building and Improvements 2,159us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TempeIAZMember
   
Costs Subsequent to Acquisition 236cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TempeIAZMember
   
Gross Carrying Amount at year end      
Land 749us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TempeIAZMember
   
Building and Improvements 2,086us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TempeIAZMember
   
Total 2,835cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TempeIAZMember
   
Accumulated Depreciation 552cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TempeIAZMember
   
Tempe II, AZ      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 35,125us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TempeIIAZMember
   
Initial cost      
Land 588us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TempeIIAZMember
   
Building and Improvements 2,898us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TempeIIAZMember
   
Costs Subsequent to Acquisition 31cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TempeIIAZMember
   
Gross Carrying Amount at year end      
Land 588us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TempeIIAZMember
   
Building and Improvements 2,929us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TempeIIAZMember
   
Total 3,517cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TempeIIAZMember
   
Accumulated Depreciation 518cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TempeIIAZMember
   
Tucson I, AZ      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 59,800us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TucsonIAZMember
   
Initial cost      
Land 188us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TucsonIAZMember
   
Building and Improvements 2,078us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TucsonIAZMember
   
Costs Subsequent to Acquisition 966cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TucsonIAZMember
   
Gross Carrying Amount at year end      
Land 384us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TucsonIAZMember
   
Building and Improvements 2,590us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TucsonIAZMember
   
Total 2,974cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TucsonIAZMember
   
Accumulated Depreciation 1,169cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TucsonIAZMember
   
Tucson II, AZ      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 43,950us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TucsonIIAZMember
   
Initial cost      
Land 188us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TucsonIIAZMember
   
Building and Improvements 2,078us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TucsonIIAZMember
   
Costs Subsequent to Acquisition 1,032cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TucsonIIAZMember
   
Gross Carrying Amount at year end      
Land 391us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TucsonIIAZMember
   
Building and Improvements 2,635us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TucsonIIAZMember
   
Total 3,026cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TucsonIIAZMember
   
Accumulated Depreciation 1,122cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TucsonIIAZMember
   
Tucson III, AZ      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 49,832us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TucsonIIIAZMember
   
Initial cost      
Land 532us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TucsonIIIAZMember
   
Building and Improvements 2,048us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TucsonIIIAZMember
   
Costs Subsequent to Acquisition 243cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TucsonIIIAZMember
   
Gross Carrying Amount at year end      
Land 533us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TucsonIIIAZMember
   
Building and Improvements 1,930us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TucsonIIIAZMember
   
Total 2,463cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TucsonIIIAZMember
   
Accumulated Depreciation 520cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TucsonIIIAZMember
   
Tucson IV, AZ      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 48,040us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TucsonIVAZMember
   
Initial cost      
Land 674us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TucsonIVAZMember
   
Building and Improvements 2,595us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TucsonIVAZMember
   
Costs Subsequent to Acquisition 262cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TucsonIVAZMember
   
Gross Carrying Amount at year end      
Land 675us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TucsonIVAZMember
   
Building and Improvements 2,436us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TucsonIVAZMember
   
Total 3,111cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TucsonIVAZMember
   
Accumulated Depreciation 662cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TucsonIVAZMember
   
Tucson V, AZ      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 45,134us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TucsonVAZMember
   
Initial cost      
Land 515us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TucsonVAZMember
   
Building and Improvements 1,980us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TucsonVAZMember
   
Costs Subsequent to Acquisition 333cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TucsonVAZMember
   
Gross Carrying Amount at year end      
Land 515us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TucsonVAZMember
   
Building and Improvements 1,957us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TucsonVAZMember
   
Total 2,472cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TucsonVAZMember
   
Accumulated Depreciation 520cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TucsonVAZMember
   
Tucson VI, AZ      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 40,814us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TucsonVIAZMember
   
Initial cost      
Land 440us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TucsonVIAZMember
   
Building and Improvements 1,692us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TucsonVIAZMember
   
Costs Subsequent to Acquisition 201cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TucsonVIAZMember
   
Gross Carrying Amount at year end      
Land 430us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TucsonVIAZMember
   
Building and Improvements 1,595us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TucsonVIAZMember
   
Total 2,025cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TucsonVIAZMember
   
Accumulated Depreciation 439cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TucsonVIAZMember
   
Tucson VII, AZ      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 52,688us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TucsonVIIAZMember
   
Initial cost      
Land 670us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TucsonVIIAZMember
   
Building and Improvements 2,576us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TucsonVIIAZMember
   
Costs Subsequent to Acquisition 275cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TucsonVIIAZMember
   
Gross Carrying Amount at year end      
Land 670us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TucsonVIIAZMember
   
Building and Improvements 2,440us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TucsonVIIAZMember
   
Total 3,110cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TucsonVIIAZMember
   
Accumulated Depreciation 673cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TucsonVIIAZMember
   
Tucson VIII, AZ      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 46,650us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TucsonVIIIAZMember
   
Initial cost      
Land 589us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TucsonVIIIAZMember
   
Building and Improvements 2,265us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TucsonVIIIAZMember
   
Costs Subsequent to Acquisition 268cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TucsonVIIIAZMember
   
Gross Carrying Amount at year end      
Land 589us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TucsonVIIIAZMember
   
Building and Improvements 2,182us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TucsonVIIIAZMember
   
Total 2,771cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TucsonVIIIAZMember
   
Accumulated Depreciation 578cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TucsonVIIIAZMember
   
Tucson IX, AZ      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 67,545us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TucsonIXAZMember
   
Initial cost      
Land 724us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TucsonIXAZMember
   
Building and Improvements 2,786us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TucsonIXAZMember
   
Costs Subsequent to Acquisition 349cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TucsonIXAZMember
   
Gross Carrying Amount at year end      
Land 725us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TucsonIXAZMember
   
Building and Improvements 2,619us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TucsonIXAZMember
   
Total 3,344cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TucsonIXAZMember
   
Accumulated Depreciation 730cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TucsonIXAZMember
   
Tucson X, AZ      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 46,350us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TucsonXAZMember
   
Initial cost      
Land 424us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TucsonXAZMember
   
Building and Improvements 1,633us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TucsonXAZMember
   
Costs Subsequent to Acquisition 203cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TucsonXAZMember
   
Gross Carrying Amount at year end      
Land 425us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TucsonXAZMember
   
Building and Improvements 1,526us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TucsonXAZMember
   
Total 1,951cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TucsonXAZMember
   
Accumulated Depreciation 424cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TucsonXAZMember
   
Tucson XI, AZ      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 42,940us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TucsonXIAZMember
   
Initial cost      
Land 439us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TucsonXIAZMember
   
Building and Improvements 1,689us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TucsonXIAZMember
   
Costs Subsequent to Acquisition 391cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TucsonXIAZMember
   
Gross Carrying Amount at year end      
Land 439us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TucsonXIAZMember
   
Building and Improvements 1,791us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TucsonXIAZMember
   
Total 2,230cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TucsonXIAZMember
   
Accumulated Depreciation 507cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TucsonXIAZMember
   
Tucson XII, AZ      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 42,225us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TucsonXIIAZMember
   
Initial cost      
Land 671us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TucsonXIIAZMember
   
Building and Improvements 2,582us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TucsonXIIAZMember
   
Costs Subsequent to Acquisition 285cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TucsonXIIAZMember
   
Gross Carrying Amount at year end      
Land 672us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TucsonXIIAZMember
   
Building and Improvements 2,454us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TucsonXIIAZMember
   
Total 3,126cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TucsonXIIAZMember
   
Accumulated Depreciation 653cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TucsonXIIAZMember
   
Tucson XIII, AZ      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 45,800us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TucsonXIIIAZMember
   
Initial cost      
Land 587us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TucsonXIIIAZMember
   
Building and Improvements 2,258us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TucsonXIIIAZMember
   
Costs Subsequent to Acquisition 271cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TucsonXIIIAZMember
   
Gross Carrying Amount at year end      
Land 587us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TucsonXIIIAZMember
   
Building and Improvements 2,167us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TucsonXIIIAZMember
   
Total 2,754cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TucsonXIIIAZMember
   
Accumulated Depreciation 584cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TucsonXIIIAZMember
   
Tucson XIV, AZ      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 49,095us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TucsonXIVAZMember
   
Initial cost      
Land 707us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TucsonXIVAZMember
   
Building and Improvements 2,721us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TucsonXIVAZMember
   
Costs Subsequent to Acquisition 455cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TucsonXIVAZMember
   
Gross Carrying Amount at year end      
Land 708us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TucsonXIVAZMember
   
Building and Improvements 2,642us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TucsonXIVAZMember
   
Total 3,350cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TucsonXIVAZMember
   
Accumulated Depreciation 707cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TucsonXIVAZMember
   
Benicia, CA      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 74,770us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BeniciaCAMember
   
Initial cost      
Land 2,392us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BeniciaCAMember
   
Building and Improvements 7,028us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BeniciaCAMember
   
Costs Subsequent to Acquisition 191cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BeniciaCAMember
   
Gross Carrying Amount at year end      
Land 2,392us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BeniciaCAMember
   
Building and Improvements 6,146us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BeniciaCAMember
   
Total 8,538cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BeniciaCAMember
   
Accumulated Depreciation 1,642cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BeniciaCAMember
   
Citrus Heights, CA      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 75,620us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CitrusHeightsCAMember
   
Initial cost      
Land 1,633us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CitrusHeightsCAMember
   
Building and Improvements 4,793us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CitrusHeightsCAMember
   
Costs Subsequent to Acquisition 213cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CitrusHeightsCAMember
   
Gross Carrying Amount at year end      
Land 1,634us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CitrusHeightsCAMember
   
Building and Improvements 4,254us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CitrusHeightsCAMember
   
Total 5,888cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CitrusHeightsCAMember
   
Accumulated Depreciation 1,198cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CitrusHeightsCAMember
   
Corona, CA      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 95,125us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CoronaCaMember
   
Initial cost      
Land 2,107us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CoronaCaMember
   
Building and Improvements 10,385us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CoronaCaMember
   
Costs Subsequent to Acquisition 1cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CoronaCaMember
   
Gross Carrying Amount at year end      
Land 2,107us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CoronaCaMember
   
Building and Improvements 10,385us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CoronaCaMember
   
Total 12,492cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CoronaCaMember
   
Accumulated Depreciation 55cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CoronaCaMember
   
Diamond Bar, CA      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 102,984us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DiamondBarCAMember
   
Initial cost      
Land 2,522us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DiamondBarCAMember
   
Building and Improvements 7,404us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DiamondBarCAMember
   
Costs Subsequent to Acquisition 179cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DiamondBarCAMember
   
Gross Carrying Amount at year end      
Land 2,524us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DiamondBarCAMember
   
Building and Improvements 6,491us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DiamondBarCAMember
   
Total 9,015cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DiamondBarCAMember
   
Accumulated Depreciation 1,820cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DiamondBarCAMember
   
Escondido, CA      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 142,895us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_EscondidoCAMember
   
Initial cost      
Land 3,040us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_EscondidoCAMember
   
Building and Improvements 11,804us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_EscondidoCAMember
   
Costs Subsequent to Acquisition 161cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_EscondidoCAMember
   
Gross Carrying Amount at year end      
Land 3,040us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_EscondidoCAMember
   
Building and Improvements 9,611us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_EscondidoCAMember
   
Total 12,651cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_EscondidoCAMember
   
Accumulated Depreciation 1,991cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_EscondidoCAMember
   
Fallbrook, CA      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 46,401us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FallbrookCAMember
   
Initial cost      
Land 133us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FallbrookCAMember
   
Building and Improvements 1,492us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FallbrookCAMember
   
Costs Subsequent to Acquisition 1,736cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FallbrookCAMember
   
Gross Carrying Amount at year end      
Land 432us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FallbrookCAMember
   
Building and Improvements 2,722us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FallbrookCAMember
   
Total 3,154cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FallbrookCAMember
   
Accumulated Depreciation 1,084cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FallbrookCAMember
   
Fremont, CA      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 51,243us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FremontCaMember
   
Initial cost      
Land 1,158us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FremontCaMember
   
Building and Improvements 5,711us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FremontCaMember
   
Costs Subsequent to Acquisition 38cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FremontCaMember
   
Gross Carrying Amount at year end      
Land 1,158us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FremontCaMember
   
Building and Improvements 5,750us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FremontCaMember
   
Total 6,908cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FremontCaMember
   
Accumulated Depreciation 45cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FremontCaMember
   
Lancaster, CA      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 60,675us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LancasterCAMember
   
Initial cost      
Land 390us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LancasterCAMember
   
Building and Improvements 2,247us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LancasterCAMember
   
Costs Subsequent to Acquisition 956cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LancasterCAMember
   
Gross Carrying Amount at year end      
Land 556us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LancasterCAMember
   
Building and Improvements 2,703us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LancasterCAMember
   
Total 3,259cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LancasterCAMember
   
Accumulated Depreciation 950cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LancasterCAMember
   
Long Beach, CA      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 124,571us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LongBeachCAMember
   
Initial cost      
Land 3,138us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LongBeachCAMember
   
Building and Improvements 14,368us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LongBeachCAMember
   
Costs Subsequent to Acquisition 493cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LongBeachCAMember
   
Gross Carrying Amount at year end      
Land 3,138us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LongBeachCAMember
   
Building and Improvements 12,950us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LongBeachCAMember
   
Total 16,088cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LongBeachCAMember
   
Accumulated Depreciation 3,352cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LongBeachCAMember
   
Murrieta, CA      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 49,795us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MurrietaCAMember
   
Initial cost      
Land 1,883us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MurrietaCAMember
   
Building and Improvements 5,532us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MurrietaCAMember
   
Costs Subsequent to Acquisition 167cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MurrietaCAMember
   
Gross Carrying Amount at year end      
Land 1,903us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MurrietaCAMember
   
Building and Improvements 4,835us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MurrietaCAMember
   
Total 6,738cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MurrietaCAMember
   
Accumulated Depreciation 1,295cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MurrietaCAMember
   
North Highlands, CA      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 57,169us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NorthHighlandsCAMember
   
Initial cost      
Land 868us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NorthHighlandsCAMember
   
Building and Improvements 2,546us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NorthHighlandsCAMember
   
Costs Subsequent to Acquisition 390cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NorthHighlandsCAMember
   
Gross Carrying Amount at year end      
Land 868us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NorthHighlandsCAMember
   
Building and Improvements 2,480us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NorthHighlandsCAMember
   
Total 3,348cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NorthHighlandsCAMember
   
Accumulated Depreciation 690cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NorthHighlandsCAMember
   
Ontario, CA      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 93,590us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_OntarioCaMember
   
Initial cost      
Land 1,705us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_OntarioCaMember
   
Building and Improvements 8,401us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_OntarioCaMember
   
Costs Subsequent to Acquisition 17cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_OntarioCaMember
   
Gross Carrying Amount at year end      
Land 1,705us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_OntarioCaMember
   
Building and Improvements 8,418us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_OntarioCaMember
   
Total 10,123cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_OntarioCaMember
   
Accumulated Depreciation 44cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_OntarioCaMember
   
Orangevale, CA      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 50,542us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_OrangevaleCAMember
   
Initial cost      
Land 1,423us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_OrangevaleCAMember
   
Building and Improvements 4,175us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_OrangevaleCAMember
   
Costs Subsequent to Acquisition 267cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_OrangevaleCAMember
   
Gross Carrying Amount at year end      
Land 1,423us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_OrangevaleCAMember
   
Building and Improvements 3,770us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_OrangevaleCAMember
   
Total 5,193cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_OrangevaleCAMember
   
Accumulated Depreciation 1,066cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_OrangevaleCAMember
   
Pleasanton, CA      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 85,045us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PleasantonCAMember
   
Initial cost      
Land 2,799us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PleasantonCAMember
   
Building and Improvements 8,222us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PleasantonCAMember
   
Costs Subsequent to Acquisition 54cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PleasantonCAMember
   
Gross Carrying Amount at year end      
Land 2,799us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PleasantonCAMember
   
Building and Improvements 7,034us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PleasantonCAMember
   
Total 9,833cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PleasantonCAMember
   
Accumulated Depreciation 1,896cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PleasantonCAMember
   
Rancho Cordova, CA      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 53,978us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_RanchoCordovaCAMember
   
Initial cost      
Land 1,094us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_RanchoCordovaCAMember
   
Building and Improvements 3,212us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_RanchoCordovaCAMember
   
Costs Subsequent to Acquisition 250cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_RanchoCordovaCAMember
   
Gross Carrying Amount at year end      
Land 1,095us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_RanchoCordovaCAMember
   
Building and Improvements 2,930us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_RanchoCordovaCAMember
   
Total 4,025cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_RanchoCordovaCAMember
   
Accumulated Depreciation 845cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_RanchoCordovaCAMember
   
Rialto I, CA      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 57,391us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_RialtoICAMember
   
Initial cost      
Land 899us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_RialtoICAMember
   
Building and Improvements 4,118us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_RialtoICAMember
   
Costs Subsequent to Acquisition 177cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_RialtoICAMember
   
Gross Carrying Amount at year end      
Land 899us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_RialtoICAMember
   
Building and Improvements 3,725us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_RialtoICAMember
   
Total 4,624cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_RialtoICAMember
   
Accumulated Depreciation 972cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_RialtoICAMember
   
Rialto II, CA      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 99,783us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_RialtoIICAMember
   
Initial cost      
Land 277us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_RialtoIICAMember
   
Building and Improvements 3,098us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_RialtoIICAMember
   
Costs Subsequent to Acquisition 1,715cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_RialtoIICAMember
   
Gross Carrying Amount at year end      
Land 672us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_RialtoIICAMember
   
Building and Improvements 4,034us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_RialtoIICAMember
   
Total 4,706cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_RialtoIICAMember
   
Accumulated Depreciation 1,815cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_RialtoIICAMember
   
Riverside I, CA      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 67,120us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_RiversideICAMember
   
Initial cost      
Land 1,351us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_RiversideICAMember
   
Building and Improvements 6,183us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_RiversideICAMember
   
Costs Subsequent to Acquisition 417cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_RiversideICAMember
   
Gross Carrying Amount at year end      
Land 1,351us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_RiversideICAMember
   
Building and Improvements 5,768us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_RiversideICAMember
   
Total 7,119cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_RiversideICAMember
   
Accumulated Depreciation 1,473cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_RiversideICAMember
   
Riverside II, CA      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 85,076us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_RiversideIICAMember
   
Initial cost      
Land 1,170us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_RiversideIICAMember
   
Building and Improvements 5,359us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_RiversideIICAMember
   
Costs Subsequent to Acquisition 355cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_RiversideIICAMember
   
Gross Carrying Amount at year end      
Land 1,170us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_RiversideIICAMember
   
Building and Improvements 4,980us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_RiversideIICAMember
   
Total 6,150cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_RiversideIICAMember
   
Accumulated Depreciation 1,289cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_RiversideIICAMember
   
Roseville, CA      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 59,944us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_RosevilleCAMember
   
Initial cost      
Land 1,284us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_RosevilleCAMember
   
Building and Improvements 3,767us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_RosevilleCAMember
   
Costs Subsequent to Acquisition 319cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_RosevilleCAMember
   
Gross Carrying Amount at year end      
Land 1,284us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_RosevilleCAMember
   
Building and Improvements 3,491us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_RosevilleCAMember
   
Total 4,775cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_RosevilleCAMember
   
Accumulated Depreciation 1,002cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_RosevilleCAMember
   
Sacramento I, CA      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 50,714us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SacramentoICAMember
   
Initial cost      
Land 1,152us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SacramentoICAMember
   
Building and Improvements 3,380us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SacramentoICAMember
   
Costs Subsequent to Acquisition 237cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SacramentoICAMember
   
Gross Carrying Amount at year end      
Land 1,152us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SacramentoICAMember
   
Building and Improvements 3,058us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SacramentoICAMember
   
Total 4,210cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SacramentoICAMember
   
Accumulated Depreciation 875cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SacramentoICAMember
   
Sacramento II, CA      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 62,088us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SacramentoIICAMember
   
Initial cost      
Land 1,406us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SacramentoIICAMember
   
Building and Improvements 4,128us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SacramentoIICAMember
   
Costs Subsequent to Acquisition 233cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SacramentoIICAMember
   
Gross Carrying Amount at year end      
Land 1,407us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SacramentoIICAMember
   
Building and Improvements 3,696us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SacramentoIICAMember
   
Total 5,103cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SacramentoIICAMember
   
Accumulated Depreciation 1,039cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SacramentoIICAMember
   
San Bernardino I, CA      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 31,070us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SanBernardinoICAMember
   
Initial cost      
Land 51us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SanBernardinoICAMember
   
Building and Improvements 572us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SanBernardinoICAMember
   
Costs Subsequent to Acquisition 1,166cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SanBernardinoICAMember
   
Gross Carrying Amount at year end      
Land 182us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SanBernardinoICAMember
   
Building and Improvements 1,422us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SanBernardinoICAMember
   
Total 1,604cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SanBernardinoICAMember
   
Accumulated Depreciation 537cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SanBernardinoICAMember
   
San Bernardino II, CA      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 41,546us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SanBernardinoIICAMember
   
Initial cost      
Land 112us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SanBernardinoIICAMember
   
Building and Improvements 1,251us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SanBernardinoIICAMember
   
Costs Subsequent to Acquisition 1,228cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SanBernardinoIICAMember
   
Gross Carrying Amount at year end      
Land 306us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SanBernardinoIICAMember
   
Building and Improvements 1,949us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SanBernardinoIICAMember
   
Total 2,255cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SanBernardinoIICAMember
   
Accumulated Depreciation 817cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SanBernardinoIICAMember
   
San Bernardino III, CA      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 35,416us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SanBernardinoIIICAMember
   
Initial cost      
Land 98us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SanBernardinoIIICAMember
   
Building and Improvements 1,093us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SanBernardinoIIICAMember
   
Costs Subsequent to Acquisition 1,194cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SanBernardinoIIICAMember
   
Gross Carrying Amount at year end      
Land 242us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SanBernardinoIIICAMember
   
Building and Improvements 1,806us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SanBernardinoIIICAMember
   
Total 2,048cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SanBernardinoIIICAMember
   
Accumulated Depreciation 706cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SanBernardinoIIICAMember
   
San Bernardino IV, CA      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 83,307us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SanBernardinoIVCAMember
   
Initial cost      
Land 1,872us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SanBernardinoIVCAMember
   
Building and Improvements 5,391us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SanBernardinoIVCAMember
   
Costs Subsequent to Acquisition 154cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SanBernardinoIVCAMember
   
Gross Carrying Amount at year end      
Land 1,872us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SanBernardinoIVCAMember
   
Building and Improvements 4,828us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SanBernardinoIVCAMember
   
Total 6,700cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SanBernardinoIVCAMember
   
Accumulated Depreciation 1,316cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SanBernardinoIVCAMember
   
San Bernardino V, CA      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 57,595us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SanBernardinoVCAMember
   
Initial cost      
Land 783us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SanBernardinoVCAMember
   
Building and Improvements 3,583us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SanBernardinoVCAMember
   
Costs Subsequent to Acquisition 478cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SanBernardinoVCAMember
   
Gross Carrying Amount at year end      
Land 783us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SanBernardinoVCAMember
   
Building and Improvements 3,534us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SanBernardinoVCAMember
   
Total 4,317cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SanBernardinoVCAMember
   
Accumulated Depreciation 923cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SanBernardinoVCAMember
   
San Bernardino VII, CA      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 78,753us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SanBernardinoVIICAMember
   
Initial cost      
Land 1,475us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SanBernardinoVIICAMember
   
Building and Improvements 6,753us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SanBernardinoVIICAMember
   
Costs Subsequent to Acquisition 274cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SanBernardinoVIICAMember
   
Gross Carrying Amount at year end      
Land 1,290us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SanBernardinoVIICAMember
   
Building and Improvements 6,281us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SanBernardinoVIICAMember
   
Total 7,571cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SanBernardinoVIICAMember
   
Accumulated Depreciation 1,643cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SanBernardinoVIICAMember
   
San Bernardino VIII, CA      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 99,004us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SanBernardinoVIIICAMember
   
Initial cost      
Land 1,691us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SanBernardinoVIIICAMember
   
Building and Improvements 7,741us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SanBernardinoVIIICAMember
   
Costs Subsequent to Acquisition 439cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SanBernardinoVIIICAMember
   
Gross Carrying Amount at year end      
Land 1,692us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SanBernardinoVIIICAMember
   
Building and Improvements 6,237us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SanBernardinoVIIICAMember
   
Total 7,929cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SanBernardinoVIIICAMember
   
Accumulated Depreciation 2,519cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SanBernardinoVIIICAMember
   
San Marcos, CA      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 37,430us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SanMarcosCAMember
   
Initial cost      
Land 775us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SanMarcosCAMember
   
Building and Improvements 2,288us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SanMarcosCAMember
   
Costs Subsequent to Acquisition 119cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SanMarcosCAMember
   
Gross Carrying Amount at year end      
Land 776us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SanMarcosCAMember
   
Building and Improvements 2,043us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SanMarcosCAMember
   
Total 2,819cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SanMarcosCAMember
   
Accumulated Depreciation 571cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SanMarcosCAMember
   
Santa Ana, CA      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 64,071us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SantaAnaCAMember
   
Initial cost      
Land 1,223us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SantaAnaCAMember
   
Building and Improvements 5,600us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SantaAnaCAMember
   
Costs Subsequent to Acquisition 280cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SantaAnaCAMember
   
Gross Carrying Amount at year end      
Land 1,223us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SantaAnaCAMember
   
Building and Improvements 5,107us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SantaAnaCAMember
   
Total 6,330cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SantaAnaCAMember
   
Accumulated Depreciation 1,331cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SantaAnaCAMember
   
South Sacramento, CA      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 52,490us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SouthSacramentoCAMember
   
Initial cost      
Land 790us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SouthSacramentoCAMember
   
Building and Improvements 2,319us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SouthSacramentoCAMember
   
Costs Subsequent to Acquisition 236cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SouthSacramentoCAMember
   
Gross Carrying Amount at year end      
Land 791us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SouthSacramentoCAMember
   
Building and Improvements 2,143us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SouthSacramentoCAMember
   
Total 2,934cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SouthSacramentoCAMember
   
Accumulated Depreciation 622cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SouthSacramentoCAMember
   
Spring Valley, CA      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 55,045us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SpringValleyCAMember
   
Initial cost      
Land 1,178us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SpringValleyCAMember
   
Building and Improvements 5,394us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SpringValleyCAMember
   
Costs Subsequent to Acquisition 561cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SpringValleyCAMember
   
Gross Carrying Amount at year end      
Land 1,178us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SpringValleyCAMember
   
Building and Improvements 5,210us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SpringValleyCAMember
   
Total 6,388cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SpringValleyCAMember
   
Accumulated Depreciation 1,368cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SpringValleyCAMember
   
Temecula I, CA      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 81,320us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TemeculaICAMember
   
Initial cost      
Land 660us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TemeculaICAMember
   
Building and Improvements 4,735us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TemeculaICAMember
   
Costs Subsequent to Acquisition 1,231cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TemeculaICAMember
   
Gross Carrying Amount at year end      
Land 899us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TemeculaICAMember
   
Building and Improvements 5,409us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TemeculaICAMember
   
Total 6,308cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TemeculaICAMember
   
Accumulated Depreciation 1,257cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TemeculaICAMember
   
Temecula II, CA      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 84,318us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TemeculaIICAMember
   
Initial cost      
Land 3,080us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TemeculaIICAMember
   
Building and Improvements 5,839us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TemeculaIICAMember
   
Costs Subsequent to Acquisition 198cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TemeculaIICAMember
   
Gross Carrying Amount at year end      
Land 3,080us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TemeculaIICAMember
   
Building and Improvements 5,108us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TemeculaIICAMember
   
Total 8,188cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TemeculaIICAMember
   
Accumulated Depreciation 1,060cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TemeculaIICAMember
   
Vista I, CA      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 74,481us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_VistaICAMember
   
Initial cost      
Land 711us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_VistaICAMember
   
Building and Improvements 4,076us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_VistaICAMember
   
Costs Subsequent to Acquisition 2,293cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_VistaICAMember
   
Gross Carrying Amount at year end      
Land 1,118us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_VistaICAMember
   
Building and Improvements 5,442us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_VistaICAMember
   
Total 6,560cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_VistaICAMember
   
Accumulated Depreciation 1,800cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_VistaICAMember
   
Vista II, CA      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 147,871us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_VistaIICAMember
   
Initial cost      
Land 4,629us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_VistaIICAMember
   
Building and Improvements 13,599us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_VistaIICAMember
   
Costs Subsequent to Acquisition 142cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_VistaIICAMember
   
Gross Carrying Amount at year end      
Land 4,629us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_VistaIICAMember
   
Building and Improvements 11,698us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_VistaIICAMember
   
Total 16,327cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_VistaIICAMember
   
Accumulated Depreciation 3,165cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_VistaIICAMember
   
Walnut, CA      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 50,708us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WalnutCAMember
   
Initial cost      
Land 1,578us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WalnutCAMember
   
Building and Improvements 4,635us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WalnutCAMember
   
Costs Subsequent to Acquisition 236cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WalnutCAMember
   
Gross Carrying Amount at year end      
Land 1,595us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WalnutCAMember
   
Building and Improvements 4,133us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WalnutCAMember
   
Total 5,728cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WalnutCAMember
   
Accumulated Depreciation 1,105cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WalnutCAMember
   
West Sacramento, CA      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 40,015us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WestSacramentoCAMember
   
Initial cost      
Land 1,222us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WestSacramentoCAMember
   
Building and Improvements 3,590us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WestSacramentoCAMember
   
Costs Subsequent to Acquisition 200cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WestSacramentoCAMember
   
Gross Carrying Amount at year end      
Land 1,222us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WestSacramentoCAMember
   
Building and Improvements 3,236us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WestSacramentoCAMember
   
Total 4,458cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WestSacramentoCAMember
   
Accumulated Depreciation 868cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WestSacramentoCAMember
   
Westminster, CA      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 68,428us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WestminsterCAMember
   
Initial cost      
Land 1,740us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WestminsterCAMember
   
Building and Improvements 5,142us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WestminsterCAMember
   
Costs Subsequent to Acquisition 303cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WestminsterCAMember
   
Gross Carrying Amount at year end      
Land 1,743us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WestminsterCAMember
   
Building and Improvements 4,560us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WestminsterCAMember
   
Total 6,303cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WestminsterCAMember
   
Accumulated Depreciation 1,292cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WestminsterCAMember
   
Aurora, CO      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 75,867us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AuroraCOMember
   
Initial cost      
Land 1,343us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AuroraCOMember
   
Building and Improvements 2,986us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AuroraCOMember
   
Costs Subsequent to Acquisition 313cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AuroraCOMember
   
Gross Carrying Amount at year end      
Land 1,343us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AuroraCOMember
   
Building and Improvements 2,764us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AuroraCOMember
   
Total 4,107cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AuroraCOMember
   
Accumulated Depreciation 739cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AuroraCOMember
   
Colorado Springs I, CO      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 47,975us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ColoradoSpringsICOMember
   
Initial cost      
Land 771us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ColoradoSpringsICOMember
   
Building and Improvements 1,717us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ColoradoSpringsICOMember
   
Costs Subsequent to Acquisition 337cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ColoradoSpringsICOMember
   
Gross Carrying Amount at year end      
Land 771us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ColoradoSpringsICOMember
   
Building and Improvements 1,711us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ColoradoSpringsICOMember
   
Total 2,482cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ColoradoSpringsICOMember
   
Accumulated Depreciation 449cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ColoradoSpringsICOMember
   
Colorado Springs II, CO      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 62,400us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ColoradoSpringsIICOMember
   
Initial cost      
Land 657us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ColoradoSpringsIICOMember
   
Building and Improvements 2,674us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ColoradoSpringsIICOMember
   
Costs Subsequent to Acquisition 210cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ColoradoSpringsIICOMember
   
Gross Carrying Amount at year end      
Land 656us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ColoradoSpringsIICOMember
   
Building and Improvements 2,377us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ColoradoSpringsIICOMember
   
Total 3,033cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ColoradoSpringsIICOMember
   
Accumulated Depreciation 641cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ColoradoSpringsIICOMember
   
Denver I, CO      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 59,200us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DenverICOMember
   
Initial cost      
Land 673us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DenverICOMember
   
Building and Improvements 2,741us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DenverICOMember
   
Costs Subsequent to Acquisition 197cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DenverICOMember
   
Gross Carrying Amount at year end      
Land 671us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DenverICOMember
   
Building and Improvements 2,436us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DenverICOMember
   
Total 3,107cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DenverICOMember
   
Accumulated Depreciation 694cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DenverICOMember
   
Denver II, CO      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 74,295us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DenverIICOMember
   
Initial cost      
Land 1,430us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DenverIICOMember
   
Building and Improvements 7,053us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DenverIICOMember
   
Costs Subsequent to Acquisition 71cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DenverIICOMember
   
Gross Carrying Amount at year end      
Land 1,430us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DenverIICOMember
   
Building and Improvements 7,123us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DenverIICOMember
   
Total 8,553cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DenverIICOMember
   
Accumulated Depreciation 341cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DenverIICOMember
   
Federal Heights, CO      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 54,770us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FederalHeightsCOMember
   
Initial cost      
Land 878us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FederalHeightsCOMember
   
Building and Improvements 1,953us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FederalHeightsCOMember
   
Costs Subsequent to Acquisition 251cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FederalHeightsCOMember
   
Gross Carrying Amount at year end      
Land 879us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FederalHeightsCOMember
   
Building and Improvements 1,810us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FederalHeightsCOMember
   
Total 2,689cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FederalHeightsCOMember
   
Accumulated Depreciation 471cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FederalHeightsCOMember
   
Golden, CO      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 87,800us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_GoldenCOMember
   
Initial cost      
Land 1,683us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_GoldenCOMember
   
Building and Improvements 3,744us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_GoldenCOMember
   
Costs Subsequent to Acquisition 404cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_GoldenCOMember
   
Gross Carrying Amount at year end      
Land 1,684us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_GoldenCOMember
   
Building and Improvements 3,477us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_GoldenCOMember
   
Total 5,161cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_GoldenCOMember
   
Accumulated Depreciation 915cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_GoldenCOMember
   
Littleton, CO      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 53,490us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LittletonCOMember
   
Initial cost      
Land 1,268us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LittletonCOMember
   
Building and Improvements 2,820us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LittletonCOMember
   
Costs Subsequent to Acquisition 277cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LittletonCOMember
   
Gross Carrying Amount at year end      
Land 1,268us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LittletonCOMember
   
Building and Improvements 2,589us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LittletonCOMember
   
Total 3,857cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LittletonCOMember
   
Accumulated Depreciation 655cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LittletonCOMember
   
Northglenn, CO      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 52,102us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NorthglennCOMember
   
Initial cost      
Land 862us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NorthglennCOMember
   
Building and Improvements 1,917us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NorthglennCOMember
   
Costs Subsequent to Acquisition 365cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NorthglennCOMember
   
Gross Carrying Amount at year end      
Land 862us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NorthglennCOMember
   
Building and Improvements 1,869us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NorthglennCOMember
   
Total 2,731cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NorthglennCOMember
   
Accumulated Depreciation 477cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NorthglennCOMember
   
Bloomfield, CT      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 48,700us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BloomfieldCTMember
   
Initial cost      
Land 78us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BloomfieldCTMember
   
Building and Improvements 880us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BloomfieldCTMember
   
Costs Subsequent to Acquisition 2,338cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BloomfieldCTMember
   
Gross Carrying Amount at year end      
Land 360us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BloomfieldCTMember
   
Building and Improvements 2,644us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BloomfieldCTMember
   
Total 3,004cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BloomfieldCTMember
   
Accumulated Depreciation 1,029cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BloomfieldCTMember
   
Branford, CT      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 50,679us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BranfordCTMember
   
Initial cost      
Land 217us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BranfordCTMember
   
Building and Improvements 2,433us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BranfordCTMember
   
Costs Subsequent to Acquisition 1,317cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BranfordCTMember
   
Gross Carrying Amount at year end      
Land 504us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BranfordCTMember
   
Building and Improvements 3,055us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BranfordCTMember
   
Total 3,559cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BranfordCTMember
   
Accumulated Depreciation 1,626cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BranfordCTMember
   
Bristol, CT      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 47,725us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BristolCTMember
   
Initial cost      
Land 1,819us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BristolCTMember
   
Building and Improvements 3,161us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BristolCTMember
   
Costs Subsequent to Acquisition 63cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BristolCTMember
   
Gross Carrying Amount at year end      
Land 1,819us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BristolCTMember
   
Building and Improvements 2,759us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BristolCTMember
   
Total 4,578cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BristolCTMember
   
Accumulated Depreciation 849cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BristolCTMember
   
East Windsor, CT      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 46,016us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_EastWindsorCTMember
   
Initial cost      
Land 744us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_EastWindsorCTMember
   
Building and Improvements 1,294us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_EastWindsorCTMember
   
Costs Subsequent to Acquisition 458cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_EastWindsorCTMember
   
Gross Carrying Amount at year end      
Land 744us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_EastWindsorCTMember
   
Building and Improvements 1,482us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_EastWindsorCTMember
   
Total 2,226cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_EastWindsorCTMember
   
Accumulated Depreciation 448cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_EastWindsorCTMember
   
Enfield, CT      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 52,875us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_EnfieldCTMember
   
Initial cost      
Land 424us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_EnfieldCTMember
   
Building and Improvements 2,424us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_EnfieldCTMember
   
Costs Subsequent to Acquisition 396cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_EnfieldCTMember
   
Gross Carrying Amount at year end      
Land 473us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_EnfieldCTMember
   
Building and Improvements 2,229us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_EnfieldCTMember
   
Total 2,702cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_EnfieldCTMember
   
Accumulated Depreciation 873cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_EnfieldCTMember
   
Gales Ferry, CT      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 54,805us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_GalesFerryCTMember
   
Initial cost      
Land 240us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_GalesFerryCTMember
   
Building and Improvements 2,697us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_GalesFerryCTMember
   
Costs Subsequent to Acquisition 1,458cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_GalesFerryCTMember
   
Gross Carrying Amount at year end      
Land 489us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_GalesFerryCTMember
   
Building and Improvements 3,473us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_GalesFerryCTMember
   
Total 3,962cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_GalesFerryCTMember
   
Accumulated Depreciation 1,503cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_GalesFerryCTMember
   
Manchester I, CT      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 46,925us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ManchesterICTMember
   
Initial cost      
Land 540us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ManchesterICTMember
   
Building and Improvements 3,096us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ManchesterICTMember
   
Costs Subsequent to Acquisition 360cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ManchesterICTMember
   
Gross Carrying Amount at year end      
Land 563us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ManchesterICTMember
   
Building and Improvements 2,684us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ManchesterICTMember
   
Total 3,247cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ManchesterICTMember
   
Accumulated Depreciation 1,100cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ManchesterICTMember
   
Manchester II, CT      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 52,725us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ManchesterIICTMember
   
Initial cost      
Land 996us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ManchesterIICTMember
   
Building and Improvements 1,730us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ManchesterIICTMember
   
Costs Subsequent to Acquisition 255cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ManchesterIICTMember
   
Gross Carrying Amount at year end      
Land 996us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ManchesterIICTMember
   
Building and Improvements 1,677us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ManchesterIICTMember
   
Total 2,673cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ManchesterIICTMember
   
Accumulated Depreciation 495cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ManchesterIICTMember
   
Manchester III, CT      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 60,113us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ManchesterIIICTMember
   
Initial cost      
Land 671us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ManchesterIIICTMember
   
Building and Improvements 3,308us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ManchesterIIICTMember
   
Costs Subsequent to Acquisition 6cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ManchesterIIICTMember
   
Gross Carrying Amount at year end      
Land 671us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ManchesterIIICTMember
   
Building and Improvements 3,314us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ManchesterIIICTMember
   
Total 3,985cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ManchesterIIICTMember
   
Accumulated Depreciation 26cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ManchesterIIICTMember
   
Milford, CT      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 44,885us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MilfordCTMember
   
Initial cost      
Land 87us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MilfordCTMember
   
Building and Improvements 1,050us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MilfordCTMember
   
Costs Subsequent to Acquisition 1,129cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MilfordCTMember
   
Gross Carrying Amount at year end      
Land 274us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MilfordCTMember
   
Building and Improvements 1,707us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MilfordCTMember
   
Total 1,981cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MilfordCTMember
   
Accumulated Depreciation 819cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MilfordCTMember
   
Monroe, CT      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 58,500us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MonroeCTMember
   
Initial cost      
Land 2,004us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MonroeCTMember
   
Building and Improvements 3,483us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MonroeCTMember
   
Costs Subsequent to Acquisition 600cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MonroeCTMember
   
Gross Carrying Amount at year end      
Land 2,004us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MonroeCTMember
   
Building and Improvements 3,399us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MonroeCTMember
   
Total 5,403cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MonroeCTMember
   
Accumulated Depreciation 1,072cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MonroeCTMember
   
Mystic, CT      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 50,825us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MysticCTMember
   
Initial cost      
Land 136us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MysticCTMember
   
Building and Improvements 1,645us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MysticCTMember
   
Costs Subsequent to Acquisition 1,927cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MysticCTMember
   
Gross Carrying Amount at year end      
Land 410us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MysticCTMember
   
Building and Improvements 2,840us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MysticCTMember
   
Total 3,250cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MysticCTMember
   
Accumulated Depreciation 1,377cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MysticCTMember
   
Newington I, CT      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 42,620us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NewingtonICTMember
   
Initial cost      
Land 1,059us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NewingtonICTMember
   
Building and Improvements 1,840us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NewingtonICTMember
   
Costs Subsequent to Acquisition 206cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NewingtonICTMember
   
Gross Carrying Amount at year end      
Land 1,059us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NewingtonICTMember
   
Building and Improvements 1,752us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NewingtonICTMember
   
Total 2,811cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NewingtonICTMember
   
Accumulated Depreciation 518cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NewingtonICTMember
   
Newington II, CT      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 36,140us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NewingtonIICTMember
   
Initial cost      
Land 911us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NewingtonIICTMember
   
Building and Improvements 1,584us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NewingtonIICTMember
   
Costs Subsequent to Acquisition 231cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NewingtonIICTMember
   
Gross Carrying Amount at year end      
Land 911us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NewingtonIICTMember
   
Building and Improvements 1,541us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NewingtonIICTMember
   
Total 2,452cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NewingtonIICTMember
   
Accumulated Depreciation 463cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NewingtonIICTMember
   
Norwalk, CT      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 30,414us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NorwalkCTMember
   
Initial cost      
Land 646us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NorwalkCTMember
   
Building and Improvements 3,187us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NorwalkCTMember
   
Costs Subsequent to Acquisition 48cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NorwalkCTMember
   
Gross Carrying Amount at year end      
Land 646us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NorwalkCTMember
   
Building and Improvements 3,235us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NorwalkCTMember
   
Total 3,881cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NorwalkCTMember
   
Accumulated Depreciation 171cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NorwalkCTMember
   
Old Saybrook I, CT      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 86,950us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_OldSaybrookICTMember
   
Initial cost      
Land 3,092us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_OldSaybrookICTMember
   
Building and Improvements 5,374us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_OldSaybrookICTMember
   
Costs Subsequent to Acquisition 519cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_OldSaybrookICTMember
   
Gross Carrying Amount at year end      
Land 3,092us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_OldSaybrookICTMember
   
Building and Improvements 5,039us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_OldSaybrookICTMember
   
Total 8,131cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_OldSaybrookICTMember
   
Accumulated Depreciation 1,537cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_OldSaybrookICTMember
   
Old Saybrook II, CT      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 26,425us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_OldSaybrookIICTMember
   
Initial cost      
Land 1,135us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_OldSaybrookIICTMember
   
Building and Improvements 1,973us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_OldSaybrookIICTMember
   
Costs Subsequent to Acquisition 231cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_OldSaybrookIICTMember
   
Gross Carrying Amount at year end      
Land 1,135us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_OldSaybrookIICTMember
   
Building and Improvements 1,877us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_OldSaybrookIICTMember
   
Total 3,012cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_OldSaybrookIICTMember
   
Accumulated Depreciation 586cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_OldSaybrookIICTMember
   
Shelton, CT      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 78,430us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SheltonCTMember
   
Initial cost      
Land 1,449us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SheltonCTMember
   
Building and Improvements 8,221us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SheltonCTMember
   
Costs Subsequent to Acquisition 179cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SheltonCTMember
   
Gross Carrying Amount at year end      
Land 1,449us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SheltonCTMember
   
Building and Improvements 7,317us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SheltonCTMember
   
Total 8,766cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SheltonCTMember
   
Accumulated Depreciation 678cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SheltonCTMember
   
South Windsor, CT      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 72,075us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SouthWindsorCTMember
   
Initial cost      
Land 90us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SouthWindsorCTMember
   
Building and Improvements 1,127us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SouthWindsorCTMember
   
Costs Subsequent to Acquisition 1,322cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SouthWindsorCTMember
   
Gross Carrying Amount at year end      
Land 272us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SouthWindsorCTMember
   
Building and Improvements 2,062us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SouthWindsorCTMember
   
Total 2,334cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SouthWindsorCTMember
   
Accumulated Depreciation 859cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SouthWindsorCTMember
   
Stamford, CT      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 28,907us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_StamfordCTMember
   
Initial cost      
Land 1,941us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_StamfordCTMember
   
Building and Improvements 3,374us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_StamfordCTMember
   
Costs Subsequent to Acquisition 102cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_StamfordCTMember
   
Gross Carrying Amount at year end      
Land 1,941us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_StamfordCTMember
   
Building and Improvements 2,940us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_StamfordCTMember
   
Total 4,881cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_StamfordCTMember
   
Accumulated Depreciation 891cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_StamfordCTMember
   
Wilton, CT      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 84,515us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WiltonCTMember
   
Encumbrances 12,635us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WiltonCTMember
   
Initial cost      
Land 2,409us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WiltonCTMember
   
Building and Improvements 12,261us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WiltonCTMember
   
Costs Subsequent to Acquisition 172cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WiltonCTMember
   
Gross Carrying Amount at year end      
Land 2,421us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WiltonCTMember
   
Building and Improvements 12,494us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WiltonCTMember
   
Total 14,915cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WiltonCTMember
   
Accumulated Depreciation 824cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WiltonCTMember
   
Washington I, DC      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 63,085us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WashingtonIDCMember
   
Initial cost      
Land 871us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WashingtonIDCMember
   
Building and Improvements 12,759us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WashingtonIDCMember
   
Costs Subsequent to Acquisition 403cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WashingtonIDCMember
   
Gross Carrying Amount at year end      
Land 894us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WashingtonIDCMember
   
Building and Improvements 10,480us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WashingtonIDCMember
   
Total 11,374cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WashingtonIDCMember
   
Accumulated Depreciation 2,048cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WashingtonIDCMember
   
Washington II, DC      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 82,982us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WashingtonIIDCMember
   
Initial cost      
Land 3,152us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WashingtonIIDCMember
   
Building and Improvements 13,612us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WashingtonIIDCMember
   
Costs Subsequent to Acquisition 146cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WashingtonIIDCMember
   
Gross Carrying Amount at year end      
Land 3,154us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WashingtonIIDCMember
   
Building and Improvements 11,983us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WashingtonIIDCMember
   
Total 15,137cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WashingtonIIDCMember
   
Accumulated Depreciation 856cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WashingtonIIDCMember
   
Boca Raton, FL      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 37,958us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BocaRatonFLMember
   
Initial cost      
Land 529us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BocaRatonFLMember
   
Building and Improvements 3,054us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BocaRatonFLMember
   
Costs Subsequent to Acquisition 1,564cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BocaRatonFLMember
   
Gross Carrying Amount at year end      
Land 813us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BocaRatonFLMember
   
Building and Improvements 3,711us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BocaRatonFLMember
   
Total 4,524cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BocaRatonFLMember
   
Accumulated Depreciation 1,259cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BocaRatonFLMember
   
Boynton Beach I, FL      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 61,749us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BoyntonBeachIFLMember
   
Initial cost      
Land 667us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BoyntonBeachIFLMember
   
Building and Improvements 3,796us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BoyntonBeachIFLMember
   
Costs Subsequent to Acquisition 1,801cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BoyntonBeachIFLMember
   
Gross Carrying Amount at year end      
Land 958us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BoyntonBeachIFLMember
   
Building and Improvements 4,507us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BoyntonBeachIFLMember
   
Total 5,465cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BoyntonBeachIFLMember
   
Accumulated Depreciation 1,530cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BoyntonBeachIFLMember
   
Boynton Beach II, FL      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 61,579us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BoyntonBeachIIFLMember
   
Initial cost      
Land 1,030us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BoyntonBeachIIFLMember
   
Building and Improvements 2,968us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BoyntonBeachIIFLMember
   
Costs Subsequent to Acquisition 329cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BoyntonBeachIIFLMember
   
Gross Carrying Amount at year end      
Land 1,030us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BoyntonBeachIIFLMember
   
Building and Improvements 2,861us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BoyntonBeachIIFLMember
   
Total 3,891cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BoyntonBeachIIFLMember
   
Accumulated Depreciation 778cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BoyntonBeachIIFLMember
   
Boynton Beach III, FL      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 67,393us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BoyntonBeachIIIFLMember
   
Initial cost      
Land 1,225us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BoyntonBeachIIIFLMember
   
Building and Improvements 6,037us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BoyntonBeachIIIFLMember
   
Costs Subsequent to Acquisition 12cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BoyntonBeachIIIFLMember
   
Gross Carrying Amount at year end      
Land 1,225us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BoyntonBeachIIIFLMember
   
Building and Improvements 6,050us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BoyntonBeachIIIFLMember
   
Total 7,275cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BoyntonBeachIIIFLMember
   
Accumulated Depreciation 48cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BoyntonBeachIIIFLMember
   
Bradenton I, FL      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 68,441us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BradentonIFLMember
   
Initial cost      
Land 1,180us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BradentonIFLMember
   
Building and Improvements 3,324us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BradentonIFLMember
   
Costs Subsequent to Acquisition 225cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BradentonIFLMember
   
Gross Carrying Amount at year end      
Land 1,180us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BradentonIFLMember
   
Building and Improvements 3,028us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BradentonIFLMember
   
Total 4,208cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BradentonIFLMember
   
Accumulated Depreciation 854cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BradentonIFLMember
   
Bradenton II, FL      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 87,958us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BradentonIIFLMember
   
Initial cost      
Land 1,931us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BradentonIIFLMember
   
Building and Improvements 5,561us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BradentonIIFLMember
   
Costs Subsequent to Acquisition 975cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BradentonIIFLMember
   
Gross Carrying Amount at year end      
Land 1,931us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BradentonIIFLMember
   
Building and Improvements 5,441us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BradentonIIFLMember
   
Total 7,372cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BradentonIIFLMember
   
Accumulated Depreciation 1,507cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BradentonIIFLMember
   
Cape Coral I, FL      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 76,842us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CapeCoralIFLMember
   
Initial cost      
Land 472us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CapeCoralIFLMember
   
Building and Improvements 2,769us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CapeCoralIFLMember
   
Costs Subsequent to Acquisition 2,538cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CapeCoralIFLMember
   
Gross Carrying Amount at year end      
Land 830us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CapeCoralIFLMember
   
Building and Improvements 4,371us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CapeCoralIFLMember
   
Total 5,201cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CapeCoralIFLMember
   
Accumulated Depreciation 1,786cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CapeCoralIFLMember
   
Cape Coral II, FL      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 67,955us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CapeCoralIIFLMember
   
Initial cost      
Land 1,093us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CapeCoralIIFLMember
   
Building and Improvements 5,387us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CapeCoralIIFLMember
   
Costs Subsequent to Acquisition 1cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CapeCoralIIFLMember
   
Gross Carrying Amount at year end      
Land 1,093us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CapeCoralIIFLMember
   
Building and Improvements 5,388us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CapeCoralIIFLMember
   
Total 6,481cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CapeCoralIIFLMember
   
Accumulated Depreciation 14cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CapeCoralIIFLMember
   
Coconut Creek II, FL      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 90,400us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CoconutCreekIIFLMember
   
Initial cost      
Land 1,937us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CoconutCreekIIFLMember
   
Building and Improvements 9,549us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CoconutCreekIIFLMember
   
Costs Subsequent to Acquisition 109cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CoconutCreekIIFLMember
   
Gross Carrying Amount at year end      
Land 1,937us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CoconutCreekIIFLMember
   
Building and Improvements 9,658us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CoconutCreekIIFLMember
   
Total 11,595cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CoconutCreekIIFLMember
   
Accumulated Depreciation 77cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CoconutCreekIIFLMember
   
Coconut Creek I, FL      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 78,883us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CoconutCreekIFLMember
   
Initial cost      
Land 1,189us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CoconutCreekIFLMember
   
Building and Improvements 5,863us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CoconutCreekIFLMember
   
Costs Subsequent to Acquisition 106cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CoconutCreekIFLMember
   
Gross Carrying Amount at year end      
Land 1,189us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CoconutCreekIFLMember
   
Building and Improvements 5,968us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CoconutCreekIFLMember
   
Total 7,157cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CoconutCreekIFLMember
   
Accumulated Depreciation 286cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CoconutCreekIFLMember
   
Dania Beach, FL      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 168,724us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DaniaBeachFLMember
   
Initial cost      
Land 3,584us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DaniaBeachFLMember
   
Building and Improvements 10,324us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DaniaBeachFLMember
   
Costs Subsequent to Acquisition 1,171cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DaniaBeachFLMember
   
Gross Carrying Amount at year end      
Land 3,584us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DaniaBeachFLMember
   
Building and Improvements 9,999us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DaniaBeachFLMember
   
Total 13,583cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DaniaBeachFLMember
   
Accumulated Depreciation 2,827cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DaniaBeachFLMember
   
Dania, FL      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 58,145us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DaniaFLMember
   
Initial cost      
Land 205us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DaniaFLMember
   
Building and Improvements 2,068us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DaniaFLMember
   
Costs Subsequent to Acquisition 1,442cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DaniaFLMember
   
Gross Carrying Amount at year end      
Land 481us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DaniaFLMember
   
Building and Improvements 2,813us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DaniaFLMember
   
Total 3,294cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DaniaFLMember
   
Accumulated Depreciation 1,375cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DaniaFLMember
   
Davie, FL      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 81,235us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DavieFLMember
   
Initial cost      
Land 1,268us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DavieFLMember
   
Building and Improvements 7,183us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DavieFLMember
   
Costs Subsequent to Acquisition 815cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DavieFLMember
   
Gross Carrying Amount at year end      
Land 1,373us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DavieFLMember
   
Building and Improvements 5,735us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DavieFLMember
   
Total 7,108cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DavieFLMember
   
Accumulated Depreciation 2,500cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DavieFLMember
   
Deerfield Beach, FL      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 57,230us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DeerfieldBeachFLMember
   
Initial cost      
Land 946us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DeerfieldBeachFLMember
   
Building and Improvements 2,999us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DeerfieldBeachFLMember
   
Costs Subsequent to Acquisition 2,019cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DeerfieldBeachFLMember
   
Gross Carrying Amount at year end      
Land 1,311us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DeerfieldBeachFLMember
   
Building and Improvements 4,524us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DeerfieldBeachFLMember
   
Total 5,835cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DeerfieldBeachFLMember
   
Accumulated Depreciation 1,631cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DeerfieldBeachFLMember
   
Delray Beach I, FL      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 67,833us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DelrayBeachIFLMember
   
Initial cost      
Land 798us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DelrayBeachIFLMember
   
Building and Improvements 4,539us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DelrayBeachIFLMember
   
Costs Subsequent to Acquisition 690cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DelrayBeachIFLMember
   
Gross Carrying Amount at year end      
Land 883us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DelrayBeachIFLMember
   
Building and Improvements 4,229us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DelrayBeachIFLMember
   
Total 5,112cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DelrayBeachIFLMember
   
Accumulated Depreciation 1,535cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DelrayBeachIFLMember
   
Delray Beach II, FL      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 75,712us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DelrayBeachIIFLMember
   
Initial cost      
Land 957us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DelrayBeachIIFLMember
   
Building and Improvements 4,718us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DelrayBeachIIFLMember
   
Costs Subsequent to Acquisition 194cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DelrayBeachIIFLMember
   
Gross Carrying Amount at year end      
Land 957us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DelrayBeachIIFLMember
   
Building and Improvements 4,912us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DelrayBeachIIFLMember
   
Total 5,869cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DelrayBeachIIFLMember
   
Accumulated Depreciation 1,507cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DelrayBeachIIFLMember
   
Delray Beach III, FL      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 94,495us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DelrayBeachIIIFLMember
   
Initial cost      
Land 2,086us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DelrayBeachIIIFLMember
   
Building and Improvements 10,286us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DelrayBeachIIIFLMember
   
Costs Subsequent to Acquisition 2cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DelrayBeachIIIFLMember
   
Gross Carrying Amount at year end      
Land 2,086us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DelrayBeachIIIFLMember
   
Building and Improvements 10,289us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DelrayBeachIIIFLMember
   
Total 12,375cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DelrayBeachIIIFLMember
   
Accumulated Depreciation 82cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DelrayBeachIIIFLMember
   
Fernandina Beach, FL      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 121,083us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FernandinaBeachFLMember
   
Initial cost      
Land 378us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FernandinaBeachFLMember
   
Building and Improvements 4,222us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FernandinaBeachFLMember
   
Costs Subsequent to Acquisition 3,668cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FernandinaBeachFLMember
   
Gross Carrying Amount at year end      
Land 643us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FernandinaBeachFLMember
   
Building and Improvements 6,991us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FernandinaBeachFLMember
   
Total 7,634cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FernandinaBeachFLMember
   
Accumulated Depreciation 2,432cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FernandinaBeachFLMember
   
Ft. Lauderdale I, FL      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 70,063us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_Ft.LauderdaleIFLMember
   
Initial cost      
Land 937us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_Ft.LauderdaleIFLMember
   
Building and Improvements 3,646us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_Ft.LauderdaleIFLMember
   
Costs Subsequent to Acquisition 2,438cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_Ft.LauderdaleIFLMember
   
Gross Carrying Amount at year end      
Land 1,384us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_Ft.LauderdaleIFLMember
   
Building and Improvements 5,416us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_Ft.LauderdaleIFLMember
   
Total 6,800cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_Ft.LauderdaleIFLMember
   
Accumulated Depreciation 1,994cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_Ft.LauderdaleIFLMember
   
Ft. Lauderdale II, FL      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 49,507us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_Ft.LauderdaleIIFLMember
   
Initial cost      
Land 862us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_Ft.LauderdaleIIFLMember
   
Building and Improvements 4,250us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_Ft.LauderdaleIIFLMember
   
Costs Subsequent to Acquisition 54cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_Ft.LauderdaleIIFLMember
   
Gross Carrying Amount at year end      
Land 862us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_Ft.LauderdaleIIFLMember
   
Building and Improvements 4,305us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_Ft.LauderdaleIIFLMember
   
Total 5,167cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_Ft.LauderdaleIIFLMember
   
Accumulated Depreciation 1,834cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_Ft.LauderdaleIIFLMember
   
Ft. Myers I, FL      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 67,546us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_Ft.MyersIFLMember
   
Initial cost      
Land 303us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_Ft.MyersIFLMember
   
Building and Improvements 3,329us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_Ft.MyersIFLMember
   
Costs Subsequent to Acquisition 824cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_Ft.MyersIFLMember
   
Gross Carrying Amount at year end      
Land 328us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_Ft.MyersIFLMember
   
Building and Improvements 3,167us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_Ft.MyersIFLMember
   
Total 3,495cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_Ft.MyersIFLMember
   
Accumulated Depreciation 1,637cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_Ft.MyersIFLMember
   
Ft. Myers II, FL      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 83,125us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_Ft.MyersIIFLMember
   
Initial cost      
Land 1,030us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_Ft.MyersIIFLMember
   
Building and Improvements 5,080us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_Ft.MyersIIFLMember
   
Costs Subsequent to Acquisition 4cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_Ft.MyersIIFLMember
   
Gross Carrying Amount at year end      
Land 1,030us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_Ft.MyersIIFLMember
   
Building and Improvements 5,084us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_Ft.MyersIIFLMember
   
Total 6,114cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_Ft.MyersIIFLMember
   
Accumulated Depreciation 40cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_Ft.MyersIIFLMember
   
Ft. Myers III, FL      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 81,554us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_Ft.MyersIIIFLMember
   
Initial cost      
Land 1,148us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_Ft.MyersIIIFLMember
   
Building and Improvements 5,658us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_Ft.MyersIIIFLMember
   
Costs Subsequent to Acquisition 29cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_Ft.MyersIIIFLMember
   
Gross Carrying Amount at year end      
Land 1,148us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_Ft.MyersIIIFLMember
   
Building and Improvements 5,688us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_Ft.MyersIIIFLMember
   
Total 6,836cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_Ft.MyersIIIFLMember
   
Accumulated Depreciation 46cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_Ft.MyersIIIFLMember
   
Jacksonville I, FL      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 80,215us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_JacksonvilleIFLMember
   
Initial cost      
Land 1,862us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_JacksonvilleIFLMember
   
Building and Improvements 5,362us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_JacksonvilleIFLMember
   
Costs Subsequent to Acquisition 72cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_JacksonvilleIFLMember
   
Gross Carrying Amount at year end      
Land 1,862us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_JacksonvilleIFLMember
   
Building and Improvements 4,752us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_JacksonvilleIFLMember
   
Total 6,614cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_JacksonvilleIFLMember
   
Accumulated Depreciation 1,190cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_JacksonvilleIFLMember
   
Jacksonville II, FL      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 65,070us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_JacksonvilleIIFLMember
   
Initial cost      
Land 950us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_JacksonvilleIIFLMember
   
Building and Improvements 7,004us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_JacksonvilleIIFLMember
   
Costs Subsequent to Acquisition 120cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_JacksonvilleIIFLMember
   
Gross Carrying Amount at year end      
Land 950us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_JacksonvilleIIFLMember
   
Building and Improvements 5,571us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_JacksonvilleIIFLMember
   
Total 6,521cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_JacksonvilleIIFLMember
   
Accumulated Depreciation 1,143cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_JacksonvilleIIFLMember
   
Jacksonville III, FL      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 65,590us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_JacksonvilleIIIFLMember
   
Initial cost      
Land 860us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_JacksonvilleIIIFLMember
   
Building and Improvements 7,409us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_JacksonvilleIIIFLMember
   
Costs Subsequent to Acquisition 989cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_JacksonvilleIIIFLMember
   
Gross Carrying Amount at year end      
Land 1,670us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_JacksonvilleIIIFLMember
   
Building and Improvements 5,997us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_JacksonvilleIIIFLMember
   
Total 7,667cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_JacksonvilleIIIFLMember
   
Accumulated Depreciation 1,239cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_JacksonvilleIIIFLMember
   
Jacksonville IV, FL      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 77,535us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_JacksonvilleIVFLMember
   
Initial cost      
Land 870us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_JacksonvilleIVFLMember
   
Building and Improvements 8,049us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_JacksonvilleIVFLMember
   
Costs Subsequent to Acquisition 1,030cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_JacksonvilleIVFLMember
   
Gross Carrying Amount at year end      
Land 1,651us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_JacksonvilleIVFLMember
   
Building and Improvements 7,004us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_JacksonvilleIVFLMember
   
Total 8,655cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_JacksonvilleIVFLMember
   
Accumulated Depreciation 1,449cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_JacksonvilleIVFLMember
   
Jacksonville V, FL      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 82,235us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_JacksonvilleVFLMember
   
Initial cost      
Land 1,220us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_JacksonvilleVFLMember
   
Building and Improvements 8,210us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_JacksonvilleVFLMember
   
Costs Subsequent to Acquisition 312cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_JacksonvilleVFLMember
   
Gross Carrying Amount at year end      
Land 1,220us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_JacksonvilleVFLMember
   
Building and Improvements 6,813us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_JacksonvilleVFLMember
   
Total 8,033cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_JacksonvilleVFLMember
   
Accumulated Depreciation 1,406cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_JacksonvilleVFLMember
   
Jacksonville VI, FL      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 74,425us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_JacksonvilleVIFLMember
   
Initial cost      
Land 755us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_JacksonvilleVIFLMember
   
Building and Improvements 3,725us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_JacksonvilleVIFLMember
   
Costs Subsequent to Acquisition 1cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_JacksonvilleVIFLMember
   
Gross Carrying Amount at year end      
Land 755us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_JacksonvilleVIFLMember
   
Building and Improvements 3,725us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_JacksonvilleVIFLMember
   
Total 4,480cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_JacksonvilleVIFLMember
   
Accumulated Depreciation 10cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_JacksonvilleVIFLMember
   
Kendall, FL      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 75,495us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_KendallFLMember
   
Initial cost      
Land 2,350us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_KendallFLMember
   
Building and Improvements 8,106us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_KendallFLMember
   
Costs Subsequent to Acquisition 201cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_KendallFLMember
   
Gross Carrying Amount at year end      
Land 2,350us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_KendallFLMember
   
Building and Improvements 6,534us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_KendallFLMember
   
Total 8,884cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_KendallFLMember
   
Accumulated Depreciation 1,346cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_KendallFLMember
   
Lake Worth I, FL      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 160,949us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LakeWorthIFLMember
   
Initial cost      
Land 183us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LakeWorthIFLMember
   
Building and Improvements 6,597us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LakeWorthIFLMember
   
Costs Subsequent to Acquisition 7,161cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LakeWorthIFLMember
   
Gross Carrying Amount at year end      
Land 354us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LakeWorthIFLMember
   
Building and Improvements 11,076us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LakeWorthIFLMember
   
Total 11,430cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LakeWorthIFLMember
   
Accumulated Depreciation 4,680cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LakeWorthIFLMember
   
Lake Worth II, FL      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 87,050us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LakeWorthIIFLMember
   
Initial cost      
Land 1,552us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LakeWorthIIFLMember
   
Building and Improvements 7,654us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LakeWorthIIFLMember
   
Costs Subsequent to Acquisition 100cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LakeWorthIIFLMember
   
Gross Carrying Amount at year end      
Land 1,552us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LakeWorthIIFLMember
   
Building and Improvements 7,753us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LakeWorthIIFLMember
   
Total 9,305cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LakeWorthIIFLMember
   
Accumulated Depreciation 61cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LakeWorthIIFLMember
   
Lakeland, FL      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 49,095us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LakelandFLMember
   
Initial cost      
Land 81us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LakelandFLMember
   
Building and Improvements 896us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LakelandFLMember
   
Costs Subsequent to Acquisition 1,127cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LakelandFLMember
   
Gross Carrying Amount at year end      
Land 256us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LakelandFLMember
   
Building and Improvements 1,440us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LakelandFLMember
   
Total 1,696cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LakelandFLMember
   
Accumulated Depreciation 803cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LakelandFLMember
   
Leisure City, FL      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 56,042us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LeisureCityFLMember
   
Initial cost      
Land 409us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LeisureCityFLMember
   
Building and Improvements 2,018us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LeisureCityFLMember
   
Costs Subsequent to Acquisition 127cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LeisureCityFLMember
   
Gross Carrying Amount at year end      
Land 409us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LeisureCityFLMember
   
Building and Improvements 2,144us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LeisureCityFLMember
   
Total 2,553cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LeisureCityFLMember
   
Accumulated Depreciation 105cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LeisureCityFLMember
   
Lutz I, FL      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 66,795us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LutzIFLMember
   
Initial cost      
Land 901us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LutzIFLMember
   
Building and Improvements 2,478us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LutzIFLMember
   
Costs Subsequent to Acquisition 232cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LutzIFLMember
   
Gross Carrying Amount at year end      
Land 901us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LutzIFLMember
   
Building and Improvements 2,325us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LutzIFLMember
   
Total 3,226cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LutzIFLMember
   
Accumulated Depreciation 640cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LutzIFLMember
   
Lutz II, FL      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 69,232us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LutzIIFLMember
   
Initial cost      
Land 992us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LutzIIFLMember
   
Building and Improvements 2,868us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LutzIIFLMember
   
Costs Subsequent to Acquisition 339cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LutzIIFLMember
   
Gross Carrying Amount at year end      
Land 992us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LutzIIFLMember
   
Building and Improvements 2,717us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LutzIIFLMember
   
Total 3,709cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LutzIIFLMember
   
Accumulated Depreciation 769cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LutzIIFLMember
   
Margate I, FL      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 53,660us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MargateIFLMember
   
Initial cost      
Land 161us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MargateIFLMember
   
Building and Improvements 1,763us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MargateIFLMember
   
Gross Carrying Amount at year end      
Land 399us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MargateIFLMember
   
Building and Improvements 3,196us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MargateIFLMember
   
Total 3,595cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MargateIFLMember
   
Accumulated Depreciation 1,402cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MargateIFLMember
   
Margate II, FL      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 65,180us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MargateIIFLMember
   
Initial cost      
Land 132us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MargateIIFLMember
   
Building and Improvements 1,473us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MargateIIFLMember
   
Gross Carrying Amount at year end      
Land 383us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MargateIIFLMember
   
Building and Improvements 2,663us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MargateIIFLMember
   
Total 3,046cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MargateIIFLMember
   
Accumulated Depreciation 1,204cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MargateIIFLMember
   
Merritt Island, FL      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 50,281us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MerrittIslandFLMember
   
Initial cost      
Land 716us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MerrittIslandFLMember
   
Building and Improvements 2,983us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MerrittIslandFLMember
   
Costs Subsequent to Acquisition 606cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MerrittIslandFLMember
   
Gross Carrying Amount at year end      
Land 796us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MerrittIslandFLMember
   
Building and Improvements 2,851us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MerrittIslandFLMember
   
Total 3,647cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MerrittIslandFLMember
   
Accumulated Depreciation 888cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MerrittIslandFLMember
   
Miami I, FL      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 46,500us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MiamiIFLMember
   
Initial cost      
Land 179us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MiamiIFLMember
   
Building and Improvements 1,999us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MiamiIFLMember
   
Costs Subsequent to Acquisition 1,811cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MiamiIFLMember
   
Gross Carrying Amount at year end      
Land 484us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MiamiIFLMember
   
Building and Improvements 3,123us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MiamiIFLMember
   
Total 3,607cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MiamiIFLMember
   
Accumulated Depreciation 1,720cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MiamiIFLMember
   
Miami II, FL      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 66,960us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MiamiIIFLMember
   
Initial cost      
Land 253us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MiamiIIFLMember
   
Building and Improvements 2,544us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MiamiIIFLMember
   
Costs Subsequent to Acquisition 1,456cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MiamiIIFLMember
   
Gross Carrying Amount at year end      
Land 561us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MiamiIIFLMember
   
Building and Improvements 3,183us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MiamiIIFLMember
   
Total 3,744cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MiamiIIFLMember
   
Accumulated Depreciation 1,634cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MiamiIIFLMember
   
Miami III, FL      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 150,425us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MiamiIIIFLMember
   
Initial cost      
Land 4,577us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MiamiIIIFLMember
   
Building and Improvements 13,185us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MiamiIIIFLMember
   
Costs Subsequent to Acquisition 816cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MiamiIIIFLMember
   
Gross Carrying Amount at year end      
Land 4,577us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MiamiIIIFLMember
   
Building and Improvements 12,177us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MiamiIIIFLMember
   
Total 16,754cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MiamiIIIFLMember
   
Accumulated Depreciation 3,073cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MiamiIIIFLMember
   
Miami IV, FL      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 76,337us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MiamiIVFLMember
   
Initial cost      
Land 1,852us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MiamiIVFLMember
   
Building and Improvements 10,494us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MiamiIVFLMember
   
Costs Subsequent to Acquisition 878cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MiamiIVFLMember
   
Gross Carrying Amount at year end      
Land 1,963us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MiamiIVFLMember
   
Building and Improvements 9,812us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MiamiIVFLMember
   
Total 11,775cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MiamiIVFLMember
   
Accumulated Depreciation 933cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MiamiIVFLMember
   
Miramar, FL      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 75,530us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MiramarFLMember
   
Initial cost      
Land 1,206us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MiramarFLMember
   
Building and Improvements 5,944us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MiramarFLMember
   
Costs Subsequent to Acquisition 50cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MiramarFLMember
   
Gross Carrying Amount at year end      
Land 1,206us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MiramarFLMember
   
Building and Improvements 5,995us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MiramarFLMember
   
Total 7,201cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MiramarFLMember
   
Accumulated Depreciation 697cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MiramarFLMember
   
Naples I, FL      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 48,150us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NaplesIFLMember
   
Initial cost      
Land 90us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NaplesIFLMember
   
Building and Improvements 1,010us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NaplesIFLMember
   
Costs Subsequent to Acquisition 2,509cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NaplesIFLMember
   
Gross Carrying Amount at year end      
Land 270us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NaplesIFLMember
   
Building and Improvements 3,139us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NaplesIFLMember
   
Total 3,409cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NaplesIFLMember
   
Accumulated Depreciation 1,362cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NaplesIFLMember
   
Naples II, FL      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 65,850us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NaplesIIFLMember
   
Initial cost      
Land 148us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NaplesIIFLMember
   
Building and Improvements 1,652us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NaplesIIFLMember
   
Costs Subsequent to Acquisition 4,320cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NaplesIIFLMember
   
Gross Carrying Amount at year end      
Land 558us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NaplesIIFLMember
   
Building and Improvements 5,278us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NaplesIIFLMember
   
Total 5,836cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NaplesIIFLMember
   
Accumulated Depreciation 2,162cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NaplesIIFLMember
   
Naples III, FL      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 80,021us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NaplesIIIFLMember
   
Initial cost      
Land 139us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NaplesIIIFLMember
   
Building and Improvements 1,561us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NaplesIIIFLMember
   
Costs Subsequent to Acquisition 4,090cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NaplesIIIFLMember
   
Gross Carrying Amount at year end      
Land 598us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NaplesIIIFLMember
   
Building and Improvements 4,340us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NaplesIIIFLMember
   
Total 4,938cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NaplesIIIFLMember
   
Accumulated Depreciation 2,100cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NaplesIIIFLMember
   
Naples IV, FL      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 40,550us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NaplesIVFLMember
   
Initial cost      
Land 262us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NaplesIVFLMember
   
Building and Improvements 2,980us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NaplesIVFLMember
   
Costs Subsequent to Acquisition 580cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NaplesIVFLMember
   
Gross Carrying Amount at year end      
Land 407us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NaplesIVFLMember
   
Building and Improvements 2,977us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NaplesIVFLMember
   
Total 3,384cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NaplesIVFLMember
   
Accumulated Depreciation 1,445cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NaplesIVFLMember
   
New Smyrna Beach, FL      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 81,454us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NewSmyrnaBeachFLMember
   
Initial cost      
Land 1,261us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NewSmyrnaBeachFLMember
   
Building and Improvements 6,215us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NewSmyrnaBeachFLMember
   
Costs Subsequent to Acquisition 1cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NewSmyrnaBeachFLMember
   
Gross Carrying Amount at year end      
Land 1,261us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NewSmyrnaBeachFLMember
   
Building and Improvements 6,215us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NewSmyrnaBeachFLMember
   
Total 7,476cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NewSmyrnaBeachFLMember
   
Accumulated Depreciation 33cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NewSmyrnaBeachFLMember
   
Ocoee, FL      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 76,250us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_OcoeeFLMember
   
Initial cost      
Land 1,286us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_OcoeeFLMember
   
Building and Improvements 3,705us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_OcoeeFLMember
   
Costs Subsequent to Acquisition 176cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_OcoeeFLMember
   
Gross Carrying Amount at year end      
Land 1,286us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_OcoeeFLMember
   
Building and Improvements 3,364us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_OcoeeFLMember
   
Total 4,650cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_OcoeeFLMember
   
Accumulated Depreciation 880cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_OcoeeFLMember
   
Orange City, FL      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 59,580us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_OrangeCityFLMember
   
Initial cost      
Land 1,191us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_OrangeCityFLMember
   
Building and Improvements 3,209us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_OrangeCityFLMember
   
Costs Subsequent to Acquisition 205cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_OrangeCityFLMember
   
Gross Carrying Amount at year end      
Land 1,191us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_OrangeCityFLMember
   
Building and Improvements 2,926us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_OrangeCityFLMember
   
Total 4,117cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_OrangeCityFLMember
   
Accumulated Depreciation 823cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_OrangeCityFLMember
   
Orlando II, FL      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 63,084us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_OrlandoIIFLMember
   
Initial cost      
Land 1,589us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_OrlandoIIFLMember
   
Building and Improvements 4,576us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_OrlandoIIFLMember
   
Costs Subsequent to Acquisition 148cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_OrlandoIIFLMember
   
Gross Carrying Amount at year end      
Land 1,589us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_OrlandoIIFLMember
   
Building and Improvements 4,085us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_OrlandoIIFLMember
   
Total 5,674cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_OrlandoIIFLMember
   
Accumulated Depreciation 1,089cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_OrlandoIIFLMember
   
Orlando III, FL      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 101,330us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_OrlandoIIIFLMember
   
Initial cost      
Land 1,209us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_OrlandoIIIFLMember
   
Building and Improvements 7,768us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_OrlandoIIIFLMember
   
Costs Subsequent to Acquisition 646cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_OrlandoIIIFLMember
   
Gross Carrying Amount at year end      
Land 1,209us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_OrlandoIIIFLMember
   
Building and Improvements 7,028us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_OrlandoIIIFLMember
   
Total 8,237cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_OrlandoIIIFLMember
   
Accumulated Depreciation 1,546cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_OrlandoIIIFLMember
   
Orlando IV, FL      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 76,565us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_OrlandoIVFLMember
   
Initial cost      
Land 633us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_OrlandoIVFLMember
   
Building and Improvements 3,587us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_OrlandoIVFLMember
   
Costs Subsequent to Acquisition 102cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_OrlandoIVFLMember
   
Gross Carrying Amount at year end      
Land 633us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_OrlandoIVFLMember
   
Building and Improvements 3,185us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_OrlandoIVFLMember
   
Total 3,818cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_OrlandoIVFLMember
   
Accumulated Depreciation 337cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_OrlandoIVFLMember
   
Orlando V, FL      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 75,358us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_OrlandoVFLMember
   
Initial cost      
Land 950us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_OrlandoVFLMember
   
Building and Improvements 4,685us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_OrlandoVFLMember
   
Costs Subsequent to Acquisition 101cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_OrlandoVFLMember
   
Gross Carrying Amount at year end      
Land 950us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_OrlandoVFLMember
   
Building and Improvements 4,785us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_OrlandoVFLMember
   
Total 5,735cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_OrlandoVFLMember
   
Accumulated Depreciation 205cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_OrlandoVFLMember
   
Orlando VI, FL      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 71,475us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_OrlandoVIFLMember
   
Initial cost      
Land 640us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_OrlandoVIFLMember
   
Building and Improvements 3,154us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_OrlandoVIFLMember
   
Costs Subsequent to Acquisition 1cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_OrlandoVIFLMember
   
Gross Carrying Amount at year end      
Land 640us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_OrlandoVIFLMember
   
Building and Improvements 3,155us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_OrlandoVIFLMember
   
Total 3,795cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_OrlandoVIFLMember
   
Accumulated Depreciation 8cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_OrlandoVIFLMember
   
Oviedo, FL      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 49,276us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_OviedoFLMember
   
Initial cost      
Land 440us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_OviedoFLMember
   
Building and Improvements 2,824us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_OviedoFLMember
   
Costs Subsequent to Acquisition 551cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_OviedoFLMember
   
Gross Carrying Amount at year end      
Land 440us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_OviedoFLMember
   
Building and Improvements 2,704us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_OviedoFLMember
   
Total 3,144cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_OviedoFLMember
   
Accumulated Depreciation 620cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_OviedoFLMember
   
Palm Coast I, FL      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 47,400us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PalmCoastIFLMember
   
Initial cost      
Land 555us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PalmCoastIFLMember
   
Building and Improvements 2,735us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PalmCoastIFLMember
   
Costs Subsequent to Acquisition 60cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PalmCoastIFLMember
   
Gross Carrying Amount at year end      
Land 555us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PalmCoastIFLMember
   
Building and Improvements 2,795us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PalmCoastIFLMember
   
Total 3,350cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PalmCoastIFLMember
   
Accumulated Depreciation 22cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PalmCoastIFLMember
   
Palm Coast II, FL      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 122,490us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PalmCoastIIFLMember
   
Encumbrances 7,962us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PalmCoastIIFLMember
   
Initial cost      
Land 1,511us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PalmCoastIIFLMember
   
Building and Improvements 7,450us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PalmCoastIIFLMember
   
Costs Subsequent to Acquisition 250cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PalmCoastIIFLMember
   
Gross Carrying Amount at year end      
Land 1,511us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PalmCoastIIFLMember
   
Building and Improvements 7,700us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PalmCoastIIFLMember
   
Total 9,211cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PalmCoastIIFLMember
   
Accumulated Depreciation 63cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PalmCoastIIFLMember
   
Pembroke Pines, FL      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 67,321us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PembrokePinesFLMember
   
Initial cost      
Land 337us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PembrokePinesFLMember
   
Building and Improvements 3,772us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PembrokePinesFLMember
   
Costs Subsequent to Acquisition 2,745cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PembrokePinesFLMember
   
Gross Carrying Amount at year end      
Land 953us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PembrokePinesFLMember
   
Building and Improvements 5,375us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PembrokePinesFLMember
   
Total 6,328cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PembrokePinesFLMember
   
Accumulated Depreciation 3,171cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PembrokePinesFLMember
   
Royal Palm Beach II, FL      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 81,394us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_RoyalPalmBeachIIFLMember
   
Initial cost      
Land 1,640us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_RoyalPalmBeachIIFLMember
   
Building and Improvements 8,607us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_RoyalPalmBeachIIFLMember
   
Costs Subsequent to Acquisition 225cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_RoyalPalmBeachIIFLMember
   
Gross Carrying Amount at year end      
Land 1,640us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_RoyalPalmBeachIIFLMember
   
Building and Improvements 7,171us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_RoyalPalmBeachIIFLMember
   
Total 8,811cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_RoyalPalmBeachIIFLMember
   
Accumulated Depreciation 1,478cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_RoyalPalmBeachIIFLMember
   
Sanford I, FL      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 61,810us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SanfordIFLMember
   
Initial cost      
Land 453us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SanfordIFLMember
   
Building and Improvements 2,911us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SanfordIFLMember
   
Costs Subsequent to Acquisition 164cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SanfordIFLMember
   
Gross Carrying Amount at year end      
Land 453us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SanfordIFLMember
   
Building and Improvements 2,509us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SanfordIFLMember
   
Total 2,962cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SanfordIFLMember
   
Accumulated Depreciation 589cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SanfordIFLMember
   
Sanford II, FL      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 70,054us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SanfordIIFLMember
   
Initial cost      
Land 1,003us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SanfordIIFLMember
   
Building and Improvements 4,944us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SanfordIIFLMember
   
Costs Subsequent to Acquisition 1cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SanfordIIFLMember
   
Gross Carrying Amount at year end      
Land 1,003us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SanfordIIFLMember
   
Building and Improvements 4,945us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SanfordIIFLMember
   
Total 5,948cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SanfordIIFLMember
   
Accumulated Depreciation 26cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SanfordIIFLMember
   
Sarasota, FL      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 71,152us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SarasotaFLMember
   
Initial cost      
Land 333us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SarasotaFLMember
   
Building and Improvements 3,656us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SarasotaFLMember
   
Costs Subsequent to Acquisition 1,313cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SarasotaFLMember
   
Gross Carrying Amount at year end      
Land 529us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SarasotaFLMember
   
Building and Improvements 3,774us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SarasotaFLMember
   
Total 4,303cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SarasotaFLMember
   
Accumulated Depreciation 1,912cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SarasotaFLMember
   
St. Augustine, FL      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 59,725us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_StAugustineFLMember
   
Initial cost      
Land 135us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_StAugustineFLMember
   
Building and Improvements 1,515us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_StAugustineFLMember
   
Costs Subsequent to Acquisition 3,330cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_StAugustineFLMember
   
Gross Carrying Amount at year end      
Land 383us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_StAugustineFLMember
   
Building and Improvements 4,274us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_StAugustineFLMember
   
Total 4,657cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_StAugustineFLMember
   
Accumulated Depreciation 1,858cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_StAugustineFLMember
   
Stuart, FL      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 87,176us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_StuartFLMember
   
Initial cost      
Land 324us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_StuartFLMember
   
Building and Improvements 3,625us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_StuartFLMember
   
Costs Subsequent to Acquisition 3,070cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_StuartFLMember
   
Gross Carrying Amount at year end      
Land 685us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_StuartFLMember
   
Building and Improvements 5,762us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_StuartFLMember
   
Total 6,447cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_StuartFLMember
   
Accumulated Depreciation 2,504cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_StuartFLMember
   
SW Ranches, FL      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 64,955us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SWRanchesFLMember
   
Initial cost      
Land 1,390us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SWRanchesFLMember
   
Building and Improvements 7,598us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SWRanchesFLMember
   
Costs Subsequent to Acquisition 139cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SWRanchesFLMember
   
Gross Carrying Amount at year end      
Land 1,390us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SWRanchesFLMember
   
Building and Improvements 5,875us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SWRanchesFLMember
   
Total 7,265cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SWRanchesFLMember
   
Accumulated Depreciation 1,215cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SWRanchesFLMember
   
Tampa, FL      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 83,913us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TampaFLMember
   
Initial cost      
Land 2,670us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TampaFLMember
   
Building and Improvements 6,249us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TampaFLMember
   
Costs Subsequent to Acquisition 121cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TampaFLMember
   
Gross Carrying Amount at year end      
Land 2,670us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TampaFLMember
   
Building and Improvements 5,017us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TampaFLMember
   
Total 7,687cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TampaFLMember
   
Accumulated Depreciation 1,036cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TampaFLMember
   
West Palm Beach I, FL      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 68,061us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WestPalmBeachIFLMember
   
Initial cost      
Land 719us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WestPalmBeachIFLMember
   
Building and Improvements 3,420us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WestPalmBeachIFLMember
   
Costs Subsequent to Acquisition 1,547cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WestPalmBeachIFLMember
   
Gross Carrying Amount at year end      
Land 835us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WestPalmBeachIFLMember
   
Building and Improvements 3,992us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WestPalmBeachIFLMember
   
Total 4,827cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WestPalmBeachIFLMember
   
Accumulated Depreciation 1,439cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WestPalmBeachIFLMember
   
West Palm Beach II, FL      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 94,428us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WestPalmBeachIIFLMember
   
Initial cost      
Land 2,129us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WestPalmBeachIIFLMember
   
Building and Improvements 8,671us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WestPalmBeachIIFLMember
   
Costs Subsequent to Acquisition 356cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WestPalmBeachIIFLMember
   
Gross Carrying Amount at year end      
Land 2,129us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WestPalmBeachIIFLMember
   
Building and Improvements 7,724us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WestPalmBeachIIFLMember
   
Total 9,853cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WestPalmBeachIIFLMember
   
Accumulated Depreciation 2,173cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WestPalmBeachIIFLMember
   
West Palm Beach III, FL      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 77,664us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WestPalmBeachIIIFLMember
   
Initial cost      
Land 804us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WestPalmBeachIIIFLMember
   
Building and Improvements 3,962us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WestPalmBeachIIIFLMember
   
Costs Subsequent to Acquisition 41cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WestPalmBeachIIIFLMember
   
Gross Carrying Amount at year end      
Land 804us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WestPalmBeachIIIFLMember
   
Building and Improvements 4,002us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WestPalmBeachIIIFLMember
   
Total 4,806cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WestPalmBeachIIIFLMember
   
Accumulated Depreciation 168cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WestPalmBeachIIIFLMember
   
West Palm Beach IV, FL      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 102,912us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WestPalmBeachIVFLMember
   
Initial cost      
Land 1,499us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WestPalmBeachIVFLMember
   
Building and Improvements 7,392us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WestPalmBeachIVFLMember
   
Costs Subsequent to Acquisition 133cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WestPalmBeachIVFLMember
   
Gross Carrying Amount at year end      
Land 1,499us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WestPalmBeachIVFLMember
   
Building and Improvements 7,524us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WestPalmBeachIVFLMember
   
Total 9,023cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WestPalmBeachIVFLMember
   
Accumulated Depreciation 59cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WestPalmBeachIVFLMember
   
Winter Park, FL      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 54,356us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WinterParkFLMember
   
Initial cost      
Land 866us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WinterParkFLMember
   
Building and Improvements 4,268us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WinterParkFLMember
   
Costs Subsequent to Acquisition 1cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WinterParkFLMember
   
Gross Carrying Amount at year end      
Land 866us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WinterParkFLMember
   
Building and Improvements 4,269us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WinterParkFLMember
   
Total 5,135cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WinterParkFLMember
   
Accumulated Depreciation 23cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WinterParkFLMember
   
Alpharetta, GA      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 90,501us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AlpharettaGAMember
   
Initial cost      
Land 806us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AlpharettaGAMember
   
Building and Improvements 4,720us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AlpharettaGAMember
   
Costs Subsequent to Acquisition 1,006cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AlpharettaGAMember
   
Gross Carrying Amount at year end      
Land 967us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AlpharettaGAMember
   
Building and Improvements 4,128us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AlpharettaGAMember
   
Total 5,095cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AlpharettaGAMember
   
Accumulated Depreciation 1,328cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AlpharettaGAMember
   
Atlanta, GA      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 66,675us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AtlantaGAMember
   
Initial cost      
Land 822us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AtlantaGAMember
   
Building and Improvements 4,053us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AtlantaGAMember
   
Costs Subsequent to Acquisition 37cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AtlantaGAMember
   
Gross Carrying Amount at year end      
Land 822us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AtlantaGAMember
   
Building and Improvements 4,091us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AtlantaGAMember
   
Total 4,913cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AtlantaGAMember
   
Accumulated Depreciation 206cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AtlantaGAMember
   
Austell, GA      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 83,675us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AustellGAMember
   
Initial cost      
Land 1,635us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AustellGAMember
   
Building and Improvements 4,711us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AustellGAMember
   
Costs Subsequent to Acquisition 201cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AustellGAMember
   
Gross Carrying Amount at year end      
Land 1,643us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AustellGAMember
   
Building and Improvements 4,257us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AustellGAMember
   
Total 5,900cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AustellGAMember
   
Accumulated Depreciation 973cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AustellGAMember
   
Decatur, GA      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 145,280us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DecaturGAMember
   
Initial cost      
Land 616us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DecaturGAMember
   
Building and Improvements 6,776us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DecaturGAMember
   
Costs Subsequent to Acquisition 220cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DecaturGAMember
   
Gross Carrying Amount at year end      
Land 616us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DecaturGAMember
   
Building and Improvements 6,089us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DecaturGAMember
   
Total 6,705cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DecaturGAMember
   
Accumulated Depreciation 3,106cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DecaturGAMember
   
Duluth, GA      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 70,885us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DuluthGAMember
   
Initial cost      
Land 373us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DuluthGAMember
   
Building and Improvements 2,044us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DuluthGAMember
   
Costs Subsequent to Acquisition 164cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DuluthGAMember
   
Gross Carrying Amount at year end      
Land 373us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DuluthGAMember
   
Building and Improvements 1,884us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DuluthGAMember
   
Total 2,257cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DuluthGAMember
   
Accumulated Depreciation 164cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DuluthGAMember
   
Lawrenceville, GA      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 73,615us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LawrencevilleGAMember
   
Initial cost      
Land 546us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LawrencevilleGAMember
   
Building and Improvements 2,903us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LawrencevilleGAMember
   
Costs Subsequent to Acquisition 327cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LawrencevilleGAMember
   
Gross Carrying Amount at year end      
Land 546us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LawrencevilleGAMember
   
Building and Improvements 2,813us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LawrencevilleGAMember
   
Total 3,359cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LawrencevilleGAMember
   
Accumulated Depreciation 246cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LawrencevilleGAMember
   
Norcross I, GA      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 85,420us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NorcrossIGAMember
   
Initial cost      
Land 514us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NorcrossIGAMember
   
Building and Improvements 2,930us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NorcrossIGAMember
   
Costs Subsequent to Acquisition 817cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NorcrossIGAMember
   
Gross Carrying Amount at year end      
Land 632us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NorcrossIGAMember
   
Building and Improvements 3,017us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NorcrossIGAMember
   
Total 3,649cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NorcrossIGAMember
   
Accumulated Depreciation 1,201cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NorcrossIGAMember
   
Norcross II, GA      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 52,545us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NorcrossIIGAMember
   
Initial cost      
Land 366us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NorcrossIIGAMember
   
Building and Improvements 2,025us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NorcrossIIGAMember
   
Costs Subsequent to Acquisition 154cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NorcrossIIGAMember
   
Gross Carrying Amount at year end      
Land 366us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NorcrossIIGAMember
   
Building and Improvements 1,895us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NorcrossIIGAMember
   
Total 2,261cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NorcrossIIGAMember
   
Accumulated Depreciation 165cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NorcrossIIGAMember
   
Norcross III, GA      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 47,220us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NorcrossIIIGAMember
   
Initial cost      
Land 938us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NorcrossIIIGAMember
   
Building and Improvements 4,625us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NorcrossIIIGAMember
   
Costs Subsequent to Acquisition 51cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NorcrossIIIGAMember
   
Gross Carrying Amount at year end      
Land 938us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NorcrossIIIGAMember
   
Building and Improvements 4,677us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NorcrossIIIGAMember
   
Total 5,615cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NorcrossIIIGAMember
   
Accumulated Depreciation 310cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NorcrossIIIGAMember
   
Norcross IV, GA      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 57,505us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NorcrossIVGAMember
   
Initial cost      
Land 576us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NorcrossIVGAMember
   
Building and Improvements 2,839us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NorcrossIVGAMember
   
Costs Subsequent to Acquisition 48cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NorcrossIVGAMember
   
Gross Carrying Amount at year end      
Land 576us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NorcrossIVGAMember
   
Building and Improvements 2,887us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NorcrossIVGAMember
   
Total 3,463cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NorcrossIVGAMember
   
Accumulated Depreciation 144cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NorcrossIVGAMember
   
Peachtree City I, GA      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 49,875us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PeachtreeCityIGAMember
   
Initial cost      
Land 435us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PeachtreeCityIGAMember
   
Building and Improvements 2,532us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PeachtreeCityIGAMember
   
Costs Subsequent to Acquisition 668cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PeachtreeCityIGAMember
   
Gross Carrying Amount at year end      
Land 529us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PeachtreeCityIGAMember
   
Building and Improvements 2,571us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PeachtreeCityIGAMember
   
Total 3,100cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PeachtreeCityIGAMember
   
Accumulated Depreciation 846cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PeachtreeCityIGAMember
   
Peachtree City II, GA      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 59,950us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PeachtreeCityIIGAMember
   
Initial cost      
Land 398us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PeachtreeCityIIGAMember
   
Building and Improvements 1,963us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PeachtreeCityIIGAMember
   
Costs Subsequent to Acquisition 16cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PeachtreeCityIIGAMember
   
Gross Carrying Amount at year end      
Land 398us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PeachtreeCityIIGAMember
   
Building and Improvements 1,979us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PeachtreeCityIIGAMember
   
Total 2,377cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PeachtreeCityIIGAMember
   
Accumulated Depreciation 100cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PeachtreeCityIIGAMember
   
Smyrna, GA      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 57,015us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SmyrnaGAMember
   
Initial cost      
Land 750us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SmyrnaGAMember
   
Building and Improvements 4,271us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SmyrnaGAMember
   
Costs Subsequent to Acquisition 242cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SmyrnaGAMember
   
Gross Carrying Amount at year end      
Land 750us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SmyrnaGAMember
   
Building and Improvements 3,483us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SmyrnaGAMember
   
Total 4,233cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SmyrnaGAMember
   
Accumulated Depreciation 1,130cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SmyrnaGAMember
   
Snellville, GA      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 79,950us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SnellvilleGAMember
   
Initial cost      
Land 1,660us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SnellvilleGAMember
   
Building and Improvements 4,781us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SnellvilleGAMember
   
Costs Subsequent to Acquisition 319cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SnellvilleGAMember
   
Gross Carrying Amount at year end      
Land 1,660us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SnellvilleGAMember
   
Building and Improvements 4,438us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SnellvilleGAMember
   
Total 6,098cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SnellvilleGAMember
   
Accumulated Depreciation 942cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SnellvilleGAMember
   
Suwanee I, GA      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 85,125us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SuwaneeIGAMember
   
Initial cost      
Land 1,737us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SuwaneeIGAMember
   
Building and Improvements 5,010us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SuwaneeIGAMember
   
Costs Subsequent to Acquisition 282cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SuwaneeIGAMember
   
Gross Carrying Amount at year end      
Land 1,737us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SuwaneeIGAMember
   
Building and Improvements 4,593us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SuwaneeIGAMember
   
Total 6,330cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SuwaneeIGAMember
   
Accumulated Depreciation 990cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SuwaneeIGAMember
   
Suwanee II, GA      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 79,590us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SuwaneeIIGAMember
   
Initial cost      
Land 800us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SuwaneeIIGAMember
   
Building and Improvements 6,942us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SuwaneeIIGAMember
   
Costs Subsequent to Acquisition 37cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SuwaneeIIGAMember
   
Gross Carrying Amount at year end      
Land 622us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SuwaneeIIGAMember
   
Building and Improvements 5,775us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SuwaneeIIGAMember
   
Total 6,397cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SuwaneeIIGAMember
   
Accumulated Depreciation 1,196cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SuwaneeIIGAMember
   
Addison, IL      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 31,325us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AddisonILMember
   
Initial cost      
Land 428us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AddisonILMember
   
Building and Improvements 3,531us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AddisonILMember
   
Costs Subsequent to Acquisition 341cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AddisonILMember
   
Gross Carrying Amount at year end      
Land 428us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AddisonILMember
   
Building and Improvements 3,372us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AddisonILMember
   
Total 3,800cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AddisonILMember
   
Accumulated Depreciation 934cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AddisonILMember
   
Aurora, IL      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 73,985us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AuroraILMember
   
Initial cost      
Land 644us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AuroraILMember
   
Building and Improvements 3,652us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AuroraILMember
   
Costs Subsequent to Acquisition 153cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AuroraILMember
   
Gross Carrying Amount at year end      
Land 644us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AuroraILMember
   
Building and Improvements 3,285us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AuroraILMember
   
Total 3,929cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AuroraILMember
   
Accumulated Depreciation 919cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AuroraILMember
   
Bartlett, IL      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 51,425us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BartlettILMember
   
Initial cost      
Land 931us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BartlettILMember
   
Building and Improvements 2,493us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BartlettILMember
   
Costs Subsequent to Acquisition 278cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BartlettILMember
   
Gross Carrying Amount at year end      
Land 931us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BartlettILMember
   
Building and Improvements 2,389us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BartlettILMember
   
Total 3,320cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BartlettILMember
   
Accumulated Depreciation 654cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BartlettILMember
   
Bellwood, IL      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 86,550us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BellwoodILMember
   
Initial cost      
Land 1,012us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BellwoodILMember
   
Building and Improvements 5,768us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BellwoodILMember
   
Costs Subsequent to Acquisition 805cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BellwoodILMember
   
Gross Carrying Amount at year end      
Land 1,012us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BellwoodILMember
   
Building and Improvements 5,275us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BellwoodILMember
   
Total 6,287cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BellwoodILMember
   
Accumulated Depreciation 1,820cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BellwoodILMember
   
Bolingbrook, IL      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 80,070us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BolingbrookILMember
   
Initial cost      
Land 1,675us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BolingbrookILMember
   
Building and Improvements 8,254us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BolingbrookILMember
   
Costs Subsequent to Acquisition 4cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BolingbrookILMember
   
Gross Carrying Amount at year end      
Land 1,675us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BolingbrookILMember
   
Building and Improvements 8,259us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BolingbrookILMember
   
Total 9,934cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BolingbrookILMember
   
Accumulated Depreciation 44cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BolingbrookILMember
   
Chicago I, IL      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 95,715us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ChicagoIILMember
   
Initial cost      
Land 2,667us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ChicagoIILMember
   
Building and Improvements 13,118us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ChicagoIILMember
   
Costs Subsequent to Acquisition 1cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ChicagoIILMember
   
Gross Carrying Amount at year end      
Land 2,667us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ChicagoIILMember
   
Building and Improvements 13,118us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ChicagoIILMember
   
Total 15,785cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ChicagoIILMember
   
Accumulated Depreciation 69cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ChicagoIILMember
   
Chicago II, IL      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 78,980us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ChicagoIIILMember
   
Initial cost      
Land 833us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ChicagoIIILMember
   
Building and Improvements 4,035us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ChicagoIIILMember
   
Costs Subsequent to Acquisition 1cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ChicagoIIILMember
   
Gross Carrying Amount at year end      
Land 833us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ChicagoIIILMember
   
Building and Improvements 4,036us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ChicagoIIILMember
   
Total 4,869cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ChicagoIIILMember
   
Accumulated Depreciation 21cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ChicagoIIILMember
   
Chicago III, IL      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 84,964us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ChicagoIIIILMember
   
Initial cost      
Land 2,427us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ChicagoIIIILMember
   
Building and Improvements 11,962us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ChicagoIIIILMember
   
Costs Subsequent to Acquisition 1cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ChicagoIIIILMember
   
Gross Carrying Amount at year end      
Land 2,427us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ChicagoIIIILMember
   
Building and Improvements 11,963us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ChicagoIIIILMember
   
Total 14,390cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ChicagoIIIILMember
   
Accumulated Depreciation 63cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ChicagoIIIILMember
   
Countryside, IL      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 99,931us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CountrysideILMember
   
Initial cost      
Land 2,607us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CountrysideILMember
   
Building and Improvements 12,684us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CountrysideILMember
   
Costs Subsequent to Acquisition 2cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CountrysideILMember
   
Gross Carrying Amount at year end      
Land 2,607us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CountrysideILMember
   
Building and Improvements 12,687us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CountrysideILMember
   
Total 15,294cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CountrysideILMember
   
Accumulated Depreciation 67cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CountrysideILMember
   
Des Plaines, IL      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 69,600us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DesPlainesILMember
   
Initial cost      
Land 1,564us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DesPlainesILMember
   
Building and Improvements 4,327us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DesPlainesILMember
   
Costs Subsequent to Acquisition 519cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DesPlainesILMember
   
Gross Carrying Amount at year end      
Land 1,564us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DesPlainesILMember
   
Building and Improvements 4,207us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DesPlainesILMember
   
Total 5,771cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DesPlainesILMember
   
Accumulated Depreciation 1,150cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DesPlainesILMember
   
Elk Grove Village, IL      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 64,104us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ElkGroveVillageILMember
   
Initial cost      
Land 1,446us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ElkGroveVillageILMember
   
Building and Improvements 3,535us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ElkGroveVillageILMember
   
Costs Subsequent to Acquisition 285cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ElkGroveVillageILMember
   
Gross Carrying Amount at year end      
Land 1,446us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ElkGroveVillageILMember
   
Building and Improvements 3,292us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ElkGroveVillageILMember
   
Total 4,738cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ElkGroveVillageILMember
   
Accumulated Depreciation 946cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ElkGroveVillageILMember
   
Evanston, IL      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 58,050us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_EvanstonILMember
   
Initial cost      
Land 1,103us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_EvanstonILMember
   
Building and Improvements 5,440us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_EvanstonILMember
   
Costs Subsequent to Acquisition 184cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_EvanstonILMember
   
Gross Carrying Amount at year end      
Land 1,103us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_EvanstonILMember
   
Building and Improvements 5,623us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_EvanstonILMember
   
Total 6,726cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_EvanstonILMember
   
Accumulated Depreciation 964cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_EvanstonILMember
   
Glenview, IL      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 100,085us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_GlenviewILMember
   
Initial cost      
Land 3,740us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_GlenviewILMember
   
Building and Improvements 10,367us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_GlenviewILMember
   
Costs Subsequent to Acquisition 559cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_GlenviewILMember
   
Gross Carrying Amount at year end      
Land 3,740us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_GlenviewILMember
   
Building and Improvements 9,461us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_GlenviewILMember
   
Total 13,201cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_GlenviewILMember
   
Accumulated Depreciation 2,599cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_GlenviewILMember
   
Gurnee, IL      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 80,300us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_GurneeILMember
   
Initial cost      
Land 1,521us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_GurneeILMember
   
Building and Improvements 5,440us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_GurneeILMember
   
Costs Subsequent to Acquisition 263cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_GurneeILMember
   
Gross Carrying Amount at year end      
Land 1,521us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_GurneeILMember
   
Building and Improvements 4,940us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_GurneeILMember
   
Total 6,461cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_GurneeILMember
   
Accumulated Depreciation 1,414cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_GurneeILMember
   
Hanover, IL      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 41,190us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_HanoverILMember
   
Initial cost      
Land 1,126us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_HanoverILMember
   
Building and Improvements 2,197us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_HanoverILMember
   
Costs Subsequent to Acquisition 261cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_HanoverILMember
   
Gross Carrying Amount at year end      
Land 1,126us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_HanoverILMember
   
Building and Improvements 2,119us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_HanoverILMember
   
Total 3,245cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_HanoverILMember
   
Accumulated Depreciation 583cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_HanoverILMember
   
Harvey, IL      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 60,090us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_HarveyILMember
   
Initial cost      
Land 869us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_HarveyILMember
   
Building and Improvements 3,635us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_HarveyILMember
   
Costs Subsequent to Acquisition 208cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_HarveyILMember
   
Gross Carrying Amount at year end      
Land 869us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_HarveyILMember
   
Building and Improvements 3,304us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_HarveyILMember
   
Total 4,173cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_HarveyILMember
   
Accumulated Depreciation 923cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_HarveyILMember
   
Joliet, IL      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 72,865us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_JolietILMember
   
Initial cost      
Land 547us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_JolietILMember
   
Building and Improvements 4,704us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_JolietILMember
   
Costs Subsequent to Acquisition 229cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_JolietILMember
   
Gross Carrying Amount at year end      
Land 547us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_JolietILMember
   
Building and Improvements 4,274us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_JolietILMember
   
Total 4,821cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_JolietILMember
   
Accumulated Depreciation 1,195cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_JolietILMember
   
Kildeer, IL      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 46,485us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_KildeerILMember
   
Initial cost      
Land 2,102us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_KildeerILMember
   
Building and Improvements 2,187us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_KildeerILMember
   
Costs Subsequent to Acquisition 217cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_KildeerILMember
   
Gross Carrying Amount at year end      
Land 1,997us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_KildeerILMember
   
Building and Improvements 2,203us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_KildeerILMember
   
Total 4,200cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_KildeerILMember
   
Accumulated Depreciation 584cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_KildeerILMember
   
Lombard, IL      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 57,691us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LombardILMember
   
Initial cost      
Land 1,305us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LombardILMember
   
Building and Improvements 3,938us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LombardILMember
   
Costs Subsequent to Acquisition 659cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LombardILMember
   
Gross Carrying Amount at year end      
Land 1,305us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LombardILMember
   
Building and Improvements 3,996us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LombardILMember
   
Total 5,301cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LombardILMember
   
Accumulated Depreciation 1,158cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LombardILMember
   
Mount Prospect, IL      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 65,000us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MountProspectILMember
   
Initial cost      
Land 1,701us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MountProspectILMember
   
Building and Improvements 3,114us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MountProspectILMember
   
Costs Subsequent to Acquisition 412cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MountProspectILMember
   
Gross Carrying Amount at year end      
Land 1,701us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MountProspectILMember
   
Building and Improvements 3,074us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MountProspectILMember
   
Total 4,775cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MountProspectILMember
   
Accumulated Depreciation 827cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MountProspectILMember
   
Mundelein, IL      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 44,700us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MundeleinILMember
   
Initial cost      
Land 1,498us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MundeleinILMember
   
Building and Improvements 2,782us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MundeleinILMember
   
Costs Subsequent to Acquisition 236cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MundeleinILMember
   
Gross Carrying Amount at year end      
Land 1,498us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MundeleinILMember
   
Building and Improvements 2,606us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MundeleinILMember
   
Total 4,104cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MundeleinILMember
   
Accumulated Depreciation 715cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MundeleinILMember
   
North Chicago, IL      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 53,400us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NorthChicagoILMember
   
Initial cost      
Land 1,073us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NorthChicagoILMember
   
Building and Improvements 3,006us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NorthChicagoILMember
   
Costs Subsequent to Acquisition 370cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NorthChicagoILMember
   
Gross Carrying Amount at year end      
Land 1,073us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NorthChicagoILMember
   
Building and Improvements 2,891us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NorthChicagoILMember
   
Total 3,964cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NorthChicagoILMember
   
Accumulated Depreciation 810cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NorthChicagoILMember
   
Plainfield I, IL      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 53,900us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PlainfieldIILMember
   
Initial cost      
Land 1,770us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PlainfieldIILMember
   
Building and Improvements 1,715us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PlainfieldIILMember
   
Costs Subsequent to Acquisition 237cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PlainfieldIILMember
   
Gross Carrying Amount at year end      
Land 1,740us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PlainfieldIILMember
   
Building and Improvements 1,660us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PlainfieldIILMember
   
Total 3,400cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PlainfieldIILMember
   
Accumulated Depreciation 452cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PlainfieldIILMember
   
Plainfield II, IL      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 51,900us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PlainfieldIIILMember
   
Initial cost      
Land 694us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PlainfieldIIILMember
   
Building and Improvements 2,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PlainfieldIIILMember
   
Costs Subsequent to Acquisition 153cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PlainfieldIIILMember
   
Gross Carrying Amount at year end      
Land 694us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PlainfieldIIILMember
   
Building and Improvements 1,820us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PlainfieldIIILMember
   
Total 2,514cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PlainfieldIIILMember
   
Accumulated Depreciation 476cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PlainfieldIIILMember
   
Schaumburg, IL      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 31,160us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SchaumburgILMember
   
Initial cost      
Land 538us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SchaumburgILMember
   
Building and Improvements 645us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SchaumburgILMember
   
Costs Subsequent to Acquisition 183cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SchaumburgILMember
   
Gross Carrying Amount at year end      
Land 538us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SchaumburgILMember
   
Building and Improvements 692us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SchaumburgILMember
   
Total 1,230cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SchaumburgILMember
   
Accumulated Depreciation 184cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SchaumburgILMember
   
Streamwood, IL      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 64,305us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_StreamwoodILMember
   
Initial cost      
Land 1,447us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_StreamwoodILMember
   
Building and Improvements 1,662us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_StreamwoodILMember
   
Costs Subsequent to Acquisition 352cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_StreamwoodILMember
   
Gross Carrying Amount at year end      
Land 1,447us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_StreamwoodILMember
   
Building and Improvements 1,703us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_StreamwoodILMember
   
Total 3,150cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_StreamwoodILMember
   
Accumulated Depreciation 470cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_StreamwoodILMember
   
Warrenville, IL      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 48,796us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WarrenvilleILMember
   
Initial cost      
Land 1,066us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WarrenvilleILMember
   
Building and Improvements 3,072us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WarrenvilleILMember
   
Costs Subsequent to Acquisition 222cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WarrenvilleILMember
   
Gross Carrying Amount at year end      
Land 1,066us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WarrenvilleILMember
   
Building and Improvements 2,862us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WarrenvilleILMember
   
Total 3,928cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WarrenvilleILMember
   
Accumulated Depreciation 745cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WarrenvilleILMember
   
Waukegan, IL      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 79,500us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WaukeganILMember
   
Initial cost      
Land 1,198us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WaukeganILMember
   
Building and Improvements 4,363us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WaukeganILMember
   
Costs Subsequent to Acquisition 337cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WaukeganILMember
   
Gross Carrying Amount at year end      
Land 1,198us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WaukeganILMember
   
Building and Improvements 4,047us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WaukeganILMember
   
Total 5,245cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WaukeganILMember
   
Accumulated Depreciation 1,138cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WaukeganILMember
   
West Chicago, IL      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 48,175us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WestChicagoILMember
   
Initial cost      
Land 1,071us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WestChicagoILMember
   
Building and Improvements 2,249us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WestChicagoILMember
   
Costs Subsequent to Acquisition 341cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WestChicagoILMember
   
Gross Carrying Amount at year end      
Land 1,071us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WestChicagoILMember
   
Building and Improvements 2,232us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WestChicagoILMember
   
Total 3,303cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WestChicagoILMember
   
Accumulated Depreciation 605cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WestChicagoILMember
   
Westmont, IL      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 53,150us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WestmontILMember
   
Initial cost      
Land 1,155us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WestmontILMember
   
Building and Improvements 3,873us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WestmontILMember
   
Costs Subsequent to Acquisition 226cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WestmontILMember
   
Gross Carrying Amount at year end      
Land 1,155us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WestmontILMember
   
Building and Improvements 3,559us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WestmontILMember
   
Total 4,714cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WestmontILMember
   
Accumulated Depreciation 974cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WestmontILMember
   
Wheeling I, IL      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 54,210us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WheelingIILMember
   
Initial cost      
Land 857us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WheelingIILMember
   
Building and Improvements 3,213us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WheelingIILMember
   
Costs Subsequent to Acquisition 325cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WheelingIILMember
   
Gross Carrying Amount at year end      
Land 857us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WheelingIILMember
   
Building and Improvements 3,065us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WheelingIILMember
   
Total 3,922cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WheelingIILMember
   
Accumulated Depreciation 858cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WheelingIILMember
   
Wheeling II, IL      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 67,825us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WheelingIIILMember
   
Initial cost      
Land 793us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WheelingIIILMember
   
Building and Improvements 3,816us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WheelingIIILMember
   
Costs Subsequent to Acquisition 451cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WheelingIIILMember
   
Gross Carrying Amount at year end      
Land 793us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WheelingIIILMember
   
Building and Improvements 3,716us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WheelingIIILMember
   
Total 4,509cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WheelingIIILMember
   
Accumulated Depreciation 1,036cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WheelingIIILMember
   
Woodridge, IL      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 50,232us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WoodridgeILMember
   
Initial cost      
Land 943us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WoodridgeILMember
   
Building and Improvements 3,397us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WoodridgeILMember
   
Costs Subsequent to Acquisition 182cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WoodridgeILMember
   
Gross Carrying Amount at year end      
Land 943us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WoodridgeILMember
   
Building and Improvements 3,103us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WoodridgeILMember
   
Total 4,046cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WoodridgeILMember
   
Accumulated Depreciation 870cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WoodridgeILMember
   
Schererville, IN      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 67,280us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ScherervilleINMember
   
Initial cost      
Land 1,134us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ScherervilleINMember
   
Building and Improvements 5,589us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ScherervilleINMember
   
Costs Subsequent to Acquisition 21cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ScherervilleINMember
   
Gross Carrying Amount at year end      
Land 1,134us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ScherervilleINMember
   
Building and Improvements 5,611us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ScherervilleINMember
   
Total 6,745cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ScherervilleINMember
   
Accumulated Depreciation 45cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ScherervilleINMember
   
Boston I, MA      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 33,286us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BostonIMAMember
   
Initial cost      
Land 538us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BostonIMAMember
   
Building and Improvements 3,048us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BostonIMAMember
   
Costs Subsequent to Acquisition 107cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BostonIMAMember
   
Gross Carrying Amount at year end      
Land 538us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BostonIMAMember
   
Building and Improvements 2,731us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BostonIMAMember
   
Total 3,269cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BostonIMAMember
   
Accumulated Depreciation 294cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BostonIMAMember
   
Boston II, MA      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 60,420us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BostonIIMAMember
   
Initial cost      
Land 1,516us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BostonIIMAMember
   
Building and Improvements 8,628us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BostonIIMAMember
   
Costs Subsequent to Acquisition 333cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BostonIIMAMember
   
Gross Carrying Amount at year end      
Land 1,516us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BostonIIMAMember
   
Building and Improvements 7,125us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BostonIIMAMember
   
Total 8,641cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BostonIIMAMember
   
Accumulated Depreciation 2,410cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BostonIIMAMember
   
Boston III, MA      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 108,205us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BostonIIIMaMember
   
Initial cost      
Land 3,211us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BostonIIIMaMember
   
Building and Improvements 15,829us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BostonIIIMaMember
   
Costs Subsequent to Acquisition 2cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BostonIIIMaMember
   
Gross Carrying Amount at year end      
Land 3,211us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BostonIIIMaMember
   
Building and Improvements 15,831us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BostonIIIMaMember
   
Total 19,042cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BostonIIIMaMember
   
Accumulated Depreciation 126cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BostonIIIMaMember
   
Leominster, MA      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 54,023us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LeominsterMAMember
   
Initial cost      
Land 90us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LeominsterMAMember
   
Building and Improvements 1,519us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LeominsterMAMember
   
Costs Subsequent to Acquisition 2,445cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LeominsterMAMember
   
Gross Carrying Amount at year end      
Land 338us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LeominsterMAMember
   
Building and Improvements 3,346us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LeominsterMAMember
   
Total 3,684cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LeominsterMAMember
   
Accumulated Depreciation 1,621cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LeominsterMAMember
   
Medford, MA      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 58,725us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MedfordMAMember
   
Initial cost      
Land 1,330us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MedfordMAMember
   
Building and Improvements 7,165us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MedfordMAMember
   
Costs Subsequent to Acquisition 241cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MedfordMAMember
   
Gross Carrying Amount at year end      
Land 1,330us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MedfordMAMember
   
Building and Improvements 5,928us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MedfordMAMember
   
Total 7,258cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MedfordMAMember
   
Accumulated Depreciation 1,188cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MedfordMAMember
   
Stoneham, MA      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 60,900us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_StonehamMAMember
   
Initial cost      
Land 1,558us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_StonehamMAMember
   
Building and Improvements 7,679us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_StonehamMAMember
   
Costs Subsequent to Acquisition 62cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_StonehamMAMember
   
Gross Carrying Amount at year end      
Land 1,558us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_StonehamMAMember
   
Building and Improvements 7,741us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_StonehamMAMember
   
Total 9,299cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_StonehamMAMember
   
Accumulated Depreciation 1,176cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_StonehamMAMember
   
Tewksbury, MA      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 61,832us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TewksburyMaMember
   
Initial cost      
Land 1,537us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TewksburyMaMember
   
Building and Improvements 7,579us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TewksburyMaMember
   
Costs Subsequent to Acquisition 14cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TewksburyMaMember
   
Gross Carrying Amount at year end      
Land 1,537us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TewksburyMaMember
   
Building and Improvements 7,593us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TewksburyMaMember
   
Total 9,130cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TewksburyMaMember
   
Accumulated Depreciation 60cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TewksburyMaMember
   
Baltimore, MD      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 93,550us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BaltimoreMDMember
   
Initial cost      
Land 1,050us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BaltimoreMDMember
   
Building and Improvements 5,997us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BaltimoreMDMember
   
Costs Subsequent to Acquisition 1,285cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BaltimoreMDMember
   
Gross Carrying Amount at year end      
Land 1,173us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BaltimoreMDMember
   
Building and Improvements 5,857us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BaltimoreMDMember
   
Total 7,030cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BaltimoreMDMember
   
Accumulated Depreciation 2,132cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BaltimoreMDMember
   
Beltsville, MD      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 63,707us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BeltsvilleMDMember
   
Initial cost      
Land 1,277us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BeltsvilleMDMember
   
Building and Improvements 6,295us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BeltsvilleMDMember
   
Costs Subsequent to Acquisition 41cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BeltsvilleMDMember
   
Gross Carrying Amount at year end      
Land 1,277us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BeltsvilleMDMember
   
Building and Improvements 6,335us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BeltsvilleMDMember
   
Total 7,612cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BeltsvilleMDMember
   
Accumulated Depreciation 2,053cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BeltsvilleMDMember
   
California, MD      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 77,840us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CaliforniaMDMember
   
Initial cost      
Land 1,486us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CaliforniaMDMember
   
Building and Improvements 4,280us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CaliforniaMDMember
   
Costs Subsequent to Acquisition 169cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CaliforniaMDMember
   
Gross Carrying Amount at year end      
Land 1,486us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CaliforniaMDMember
   
Building and Improvements 3,857us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CaliforniaMDMember
   
Total 5,343cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CaliforniaMDMember
   
Accumulated Depreciation 1,079cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CaliforniaMDMember
   
Clinton, MD      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 84,225us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ClintonMDMember
   
Encumbrances 8,427us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ClintonMDMember
   
Initial cost      
Land 2,182us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ClintonMDMember
   
Building and Improvements 10,757us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ClintonMDMember
   
Costs Subsequent to Acquisition 26cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ClintonMDMember
   
Gross Carrying Amount at year end      
Land 2,182us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ClintonMDMember
   
Building and Improvements 10,782us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ClintonMDMember
   
Total 12,964cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ClintonMDMember
   
Accumulated Depreciation 1,043cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ClintonMDMember
   
District Heights, MD      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 78,490us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DistrictHeightsMDMember
   
Initial cost      
Land 1,527us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DistrictHeightsMDMember
   
Building and Improvements 8,313us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DistrictHeightsMDMember
   
Costs Subsequent to Acquisition 460cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DistrictHeightsMDMember
   
Gross Carrying Amount at year end      
Land 1,527us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DistrictHeightsMDMember
   
Building and Improvements 7,648us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DistrictHeightsMDMember
   
Total 9,175cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DistrictHeightsMDMember
   
Accumulated Depreciation 626cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DistrictHeightsMDMember
   
Elkridge, MD      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 63,525us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ElkridgeMDMember
   
Initial cost      
Land 1,155us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ElkridgeMDMember
   
Building and Improvements 5,695us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ElkridgeMDMember
   
Costs Subsequent to Acquisition 120cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ElkridgeMDMember
   
Gross Carrying Amount at year end      
Land 1,155us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ElkridgeMDMember
   
Building and Improvements 5,815us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ElkridgeMDMember
   
Total 6,970cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ElkridgeMDMember
   
Accumulated Depreciation 382cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ElkridgeMDMember
   
Gaithersburg, MD      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 87,045us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_GaithersburgMDMember
   
Initial cost      
Land 3,124us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_GaithersburgMDMember
   
Building and Improvements 9,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_GaithersburgMDMember
   
Costs Subsequent to Acquisition 392cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_GaithersburgMDMember
   
Gross Carrying Amount at year end      
Land 3,124us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_GaithersburgMDMember
   
Building and Improvements 8,132us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_GaithersburgMDMember
   
Total 11,256cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_GaithersburgMDMember
   
Accumulated Depreciation 2,256cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_GaithersburgMDMember
   
Hyattsville, MD      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 52,765us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_HyattsvilleMDMember
   
Initial cost      
Land 1,113us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_HyattsvilleMDMember
   
Building and Improvements 5,485us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_HyattsvilleMDMember
   
Costs Subsequent to Acquisition 33cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_HyattsvilleMDMember
   
Gross Carrying Amount at year end      
Land 1,113us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_HyattsvilleMDMember
   
Building and Improvements 5,519us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_HyattsvilleMDMember
   
Total 6,632cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_HyattsvilleMDMember
   
Accumulated Depreciation 2,085cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_HyattsvilleMDMember
   
Laurel, MD      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 162,696us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LaurelMDMember
   
Initial cost      
Land 1,409us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LaurelMDMember
   
Building and Improvements 8,035us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LaurelMDMember
   
Costs Subsequent to Acquisition 3,592cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LaurelMDMember
   
Gross Carrying Amount at year end      
Land 1,928us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LaurelMDMember
   
Building and Improvements 9,521us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LaurelMDMember
   
Total 11,449cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LaurelMDMember
   
Accumulated Depreciation 3,297cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LaurelMDMember
   
Temple Hills I, MD      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 97,150us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TempleHillsIMDMember
   
Initial cost      
Land 1,541us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TempleHillsIMDMember
   
Building and Improvements 8,788us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TempleHillsIMDMember
   
Costs Subsequent to Acquisition 2,391cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TempleHillsIMDMember
   
Gross Carrying Amount at year end      
Land 1,800us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TempleHillsIMDMember
   
Building and Improvements 9,333us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TempleHillsIMDMember
   
Total 11,133cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TempleHillsIMDMember
   
Accumulated Depreciation 3,743cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TempleHillsIMDMember
   
Temple Hills II, MD      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 84,100us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TempleHillsIIMDMember
   
Encumbrances 7,466us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TempleHillsIIMDMember
   
Initial cost      
Land 2,229us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TempleHillsIIMDMember
   
Building and Improvements 10,988us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TempleHillsIIMDMember
   
Costs Subsequent to Acquisition 15cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TempleHillsIIMDMember
   
Gross Carrying Amount at year end      
Land 2,229us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TempleHillsIIMDMember
   
Building and Improvements 11,003us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TempleHillsIIMDMember
   
Total 13,232cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TempleHillsIIMDMember
   
Accumulated Depreciation 88cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TempleHillsIIMDMember
   
Timonium, MD      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 66,717us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TimoniumMDMember
   
Encumbrances 7,919us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TimoniumMDMember
   
Initial cost      
Land 2,269us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TimoniumMDMember
   
Building and Improvements 11,184us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TimoniumMDMember
   
Costs Subsequent to Acquisition 36cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TimoniumMDMember
   
Gross Carrying Amount at year end      
Land 2,269us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TimoniumMDMember
   
Building and Improvements 11,220us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TimoniumMDMember
   
Total 13,489cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TimoniumMDMember
   
Accumulated Depreciation 89cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TimoniumMDMember
   
Upper Marlboro, MD      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 62,290us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_UpperMarlboroMDMember
   
Initial cost      
Land 1,309us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_UpperMarlboroMDMember
   
Building and Improvements 6,455us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_UpperMarlboroMDMember
   
Costs Subsequent to Acquisition 59cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_UpperMarlboroMDMember
   
Gross Carrying Amount at year end      
Land 1,309us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_UpperMarlboroMDMember
   
Building and Improvements 6,513us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_UpperMarlboroMDMember
   
Total 7,822cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_UpperMarlboroMDMember
   
Accumulated Depreciation 3,569cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_UpperMarlboroMDMember
   
Belmont, NC      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 81,850us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BelmontNCMember
   
Initial cost      
Land 385us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BelmontNCMember
   
Building and Improvements 2,196us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BelmontNCMember
   
Costs Subsequent to Acquisition 834cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BelmontNCMember
   
Gross Carrying Amount at year end      
Land 451us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BelmontNCMember
   
Building and Improvements 2,349us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BelmontNCMember
   
Total 2,800cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BelmontNCMember
   
Accumulated Depreciation 783cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BelmontNCMember
   
Burlington I, NC      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 109,396us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BurlingtonINCMember
   
Initial cost      
Land 498us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BurlingtonINCMember
   
Building and Improvements 2,837us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BurlingtonINCMember
   
Costs Subsequent to Acquisition 706cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BurlingtonINCMember
   
Gross Carrying Amount at year end      
Land 498us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BurlingtonINCMember
   
Building and Improvements 2,910us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BurlingtonINCMember
   
Total 3,408cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BurlingtonINCMember
   
Accumulated Depreciation 1,008cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BurlingtonINCMember
   
Burlington II, NC      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 42,165us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BurlingtonIINCMember
   
Initial cost      
Land 320us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BurlingtonIINCMember
   
Building and Improvements 1,829us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BurlingtonIINCMember
   
Costs Subsequent to Acquisition 363cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BurlingtonIINCMember
   
Gross Carrying Amount at year end      
Land 340us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BurlingtonIINCMember
   
Building and Improvements 1,760us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BurlingtonIINCMember
   
Total 2,100cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BurlingtonIINCMember
   
Accumulated Depreciation 605cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BurlingtonIINCMember
   
Cary, NC      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 112,402us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CaryNCMember
   
Initial cost      
Land 543us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CaryNCMember
   
Building and Improvements 3,097us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CaryNCMember
   
Costs Subsequent to Acquisition 670cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CaryNCMember
   
Gross Carrying Amount at year end      
Land 543us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CaryNCMember
   
Building and Improvements 3,495us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CaryNCMember
   
Total 4,038cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CaryNCMember
   
Accumulated Depreciation 1,326cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CaryNCMember
   
Charlotte, NC      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 69,000us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CharlotteNCMember
   
Initial cost      
Land 782us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CharlotteNCMember
   
Building and Improvements 4,429us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CharlotteNCMember
   
Costs Subsequent to Acquisition 1,458cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CharlotteNCMember
   
Gross Carrying Amount at year end      
Land 1,068us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CharlotteNCMember
   
Building and Improvements 4,693us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CharlotteNCMember
   
Total 5,761cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CharlotteNCMember
   
Accumulated Depreciation 1,469cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CharlotteNCMember
   
Raleigh, NC      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 48,675us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_RaleighNCMember
   
Initial cost      
Land 209us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_RaleighNCMember
   
Building and Improvements 2,398us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_RaleighNCMember
   
Costs Subsequent to Acquisition 327cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_RaleighNCMember
   
Gross Carrying Amount at year end      
Land 296us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_RaleighNCMember
   
Building and Improvements 2,255us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_RaleighNCMember
   
Total 2,551cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_RaleighNCMember
   
Accumulated Depreciation 1,083cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_RaleighNCMember
   
Bordentown, NJ      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 50,600us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BordentownNJMember
   
Initial cost      
Land 457us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BordentownNJMember
   
Building and Improvements 2,255us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BordentownNJMember
   
Costs Subsequent to Acquisition 22cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BordentownNJMember
   
Gross Carrying Amount at year end      
Land 457us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BordentownNJMember
   
Building and Improvements 2,277us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BordentownNJMember
   
Total 2,734cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BordentownNJMember
   
Accumulated Depreciation 115cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BordentownNJMember
   
Brick, NJ      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 51,725us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BrickNJMember
   
Initial cost      
Land 234us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BrickNJMember
   
Building and Improvements 2,762us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BrickNJMember
   
Costs Subsequent to Acquisition 1,431cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BrickNJMember
   
Gross Carrying Amount at year end      
Land 485us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BrickNJMember
   
Building and Improvements 3,393us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BrickNJMember
   
Total 3,878cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BrickNJMember
   
Accumulated Depreciation 1,750cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BrickNJMember
   
Cherry Hill I, NJ      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 51,500us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CherryHillINJMember
   
Initial cost      
Land 222us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CherryHillINJMember
   
Building and Improvements 1,260us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CherryHillINJMember
   
Costs Subsequent to Acquisition 81cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CherryHillINJMember
   
Gross Carrying Amount at year end      
Land 222us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CherryHillINJMember
   
Building and Improvements 1,159us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CherryHillINJMember
   
Total 1,381cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CherryHillINJMember
   
Accumulated Depreciation 129cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CherryHillINJMember
   
Cherry Hill II, NJ      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 64,825us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CherryHillIINJMember
   
Initial cost      
Land 471us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CherryHillIINJMember
   
Building and Improvements 2,323us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CherryHillIINJMember
   
Costs Subsequent to Acquisition 88cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CherryHillIINJMember
   
Gross Carrying Amount at year end      
Land 471us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CherryHillIINJMember
   
Building and Improvements 2,410us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CherryHillIINJMember
   
Total 2,881cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CherryHillIINJMember
   
Accumulated Depreciation 105cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CherryHillIINJMember
   
Clifton, NJ      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 105,550us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CliftonNJMember
   
Initial cost      
Land 4,346us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CliftonNJMember
   
Building and Improvements 12,520us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CliftonNJMember
   
Costs Subsequent to Acquisition 240cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CliftonNJMember
   
Gross Carrying Amount at year end      
Land 4,340us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CliftonNJMember
   
Building and Improvements 11,081us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CliftonNJMember
   
Total 15,421cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CliftonNJMember
   
Accumulated Depreciation 2,899cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CliftonNJMember
   
Cranford, NJ      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 91,280us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CranfordNJMember
   
Initial cost      
Land 290us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CranfordNJMember
   
Building and Improvements 3,493us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CranfordNJMember
   
Costs Subsequent to Acquisition 2,423cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CranfordNJMember
   
Gross Carrying Amount at year end      
Land 779us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CranfordNJMember
   
Building and Improvements 4,748us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CranfordNJMember
   
Total 5,527cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CranfordNJMember
   
Accumulated Depreciation 2,289cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CranfordNJMember
   
East Hanover, NJ      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 107,679us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_EastHanoverNJMember
   
Initial cost      
Land 504us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_EastHanoverNJMember
   
Building and Improvements 5,763us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_EastHanoverNJMember
   
Costs Subsequent to Acquisition 3,961cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_EastHanoverNJMember
   
Gross Carrying Amount at year end      
Land 1,315us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_EastHanoverNJMember
   
Building and Improvements 7,861us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_EastHanoverNJMember
   
Total 9,176cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_EastHanoverNJMember
   
Accumulated Depreciation 3,963cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_EastHanoverNJMember
   
Egg Harbor I, NJ      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 35,825us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_EggHarborNJMember
   
Initial cost      
Land 104us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_EggHarborNJMember
   
Building and Improvements 510us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_EggHarborNJMember
   
Costs Subsequent to Acquisition 30cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_EggHarborNJMember
   
Gross Carrying Amount at year end      
Land 104us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_EggHarborNJMember
   
Building and Improvements 529us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_EggHarborNJMember
   
Total 633cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_EggHarborNJMember
   
Accumulated Depreciation 57cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_EggHarborNJMember
   
Egg Harbor II, NJ      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 70,400us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_EggHarborNJOneMember
   
Initial cost      
Land 284us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_EggHarborNJOneMember
   
Building and Improvements 1,608us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_EggHarborNJOneMember
   
Costs Subsequent to Acquisition 183cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_EggHarborNJOneMember
   
Gross Carrying Amount at year end      
Land 284us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_EggHarborNJOneMember
   
Building and Improvements 1,571us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_EggHarborNJOneMember
   
Total 1,855cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_EggHarborNJOneMember
   
Accumulated Depreciation 178cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_EggHarborNJOneMember
   
Elizabeth, NJ      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 38,830us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ElizabethNJMember
   
Initial cost      
Land 751us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ElizabethNJMember
   
Building and Improvements 2,164us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ElizabethNJMember
   
Costs Subsequent to Acquisition 454cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ElizabethNJMember
   
Gross Carrying Amount at year end      
Land 751us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ElizabethNJMember
   
Building and Improvements 2,294us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ElizabethNJMember
   
Total 3,045cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ElizabethNJMember
   
Accumulated Depreciation 601cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ElizabethNJMember
   
Fairview, NJ      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 27,876us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FairviewNJMember
   
Initial cost      
Land 246us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FairviewNJMember
   
Building and Improvements 2,759us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FairviewNJMember
   
Costs Subsequent to Acquisition 442cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FairviewNJMember
   
Gross Carrying Amount at year end      
Land 246us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FairviewNJMember
   
Building and Improvements 2,608us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FairviewNJMember
   
Total 2,854cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FairviewNJMember
   
Accumulated Depreciation 1,454cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FairviewNJMember
   
Freehold, NJ      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 81,420us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FreeholdNJMember
   
Initial cost      
Land 1,086us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FreeholdNJMember
   
Building and Improvements 5,355us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FreeholdNJMember
   
Costs Subsequent to Acquisition 96cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FreeholdNJMember
   
Gross Carrying Amount at year end      
Land 1,086us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FreeholdNJMember
   
Building and Improvements 5,451us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FreeholdNJMember
   
Total 6,537cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FreeholdNJMember
   
Accumulated Depreciation 264cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FreeholdNJMember
   
Hamilton, NJ      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 70,450us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_HamiltonNJMember
   
Initial cost      
Land 1,885us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_HamiltonNJMember
   
Building and Improvements 5,430us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_HamiltonNJMember
   
Costs Subsequent to Acquisition 246cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_HamiltonNJMember
   
Gross Carrying Amount at year end      
Land 1,893us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_HamiltonNJMember
   
Building and Improvements 4,911us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_HamiltonNJMember
   
Total 6,804cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_HamiltonNJMember
   
Accumulated Depreciation 1,166cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_HamiltonNJMember
   
Hoboken, NJ      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 34,180us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_HobokenNJMember
   
Initial cost      
Land 1,370us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_HobokenNJMember
   
Building and Improvements 3,947us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_HobokenNJMember
   
Costs Subsequent to Acquisition 641cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_HobokenNJMember
   
Gross Carrying Amount at year end      
Land 1,370us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_HobokenNJMember
   
Building and Improvements 3,961us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_HobokenNJMember
   
Total 5,331cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_HobokenNJMember
   
Accumulated Depreciation 1,138cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_HobokenNJMember
   
Linden, NJ      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 100,425us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LindenNJMember
   
Initial cost      
Land 517us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LindenNJMember
   
Building and Improvements 6,008us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LindenNJMember
   
Costs Subsequent to Acquisition 2,291cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LindenNJMember
   
Gross Carrying Amount at year end      
Land 1,043us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LindenNJMember
   
Building and Improvements 6,817us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LindenNJMember
   
Total 7,860cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LindenNJMember
   
Accumulated Depreciation 3,669cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LindenNJMember
   
Lumberton, NJ      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 96,025us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LumbertonNJMember
   
Initial cost      
Land 987us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LumbertonNJMember
   
Building and Improvements 4,864us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LumbertonNJMember
   
Costs Subsequent to Acquisition 88cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LumbertonNJMember
   
Gross Carrying Amount at year end      
Land 987us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LumbertonNJMember
   
Building and Improvements 4,952us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LumbertonNJMember
   
Total 5,939cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LumbertonNJMember
   
Accumulated Depreciation 251cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LumbertonNJMember
   
Morris Township, NJ      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 71,976us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MorrisTownshipNJMember
   
Initial cost      
Land 500us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MorrisTownshipNJMember
   
Building and Improvements 5,602us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MorrisTownshipNJMember
   
Costs Subsequent to Acquisition 2,687cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MorrisTownshipNJMember
   
Gross Carrying Amount at year end      
Land 1,072us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MorrisTownshipNJMember
   
Building and Improvements 6,679us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MorrisTownshipNJMember
   
Total 7,751cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MorrisTownshipNJMember
   
Accumulated Depreciation 4,646cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MorrisTownshipNJMember
   
Parsippany, NJ      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 58,550us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ParsippanyNJMember
   
Initial cost      
Land 475us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ParsippanyNJMember
   
Building and Improvements 5,322us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ParsippanyNJMember
   
Costs Subsequent to Acquisition 2,008cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ParsippanyNJMember
   
Gross Carrying Amount at year end      
Land 844us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ParsippanyNJMember
   
Building and Improvements 6,016us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ParsippanyNJMember
   
Total 6,860cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ParsippanyNJMember
   
Accumulated Depreciation 3,096cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ParsippanyNJMember
   
Rahway, NJ      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 83,121us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_RahwayNJMember
   
Initial cost      
Land 1,486us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_RahwayNJMember
   
Building and Improvements 7,326us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_RahwayNJMember
   
Costs Subsequent to Acquisition 98cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_RahwayNJMember
   
Gross Carrying Amount at year end      
Land 1,486us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_RahwayNJMember
   
Building and Improvements 7,424us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_RahwayNJMember
   
Total 8,910cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_RahwayNJMember
   
Accumulated Depreciation 1,725cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_RahwayNJMember
   
Randolph, NJ      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 52,565us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_RandolphNJMember
   
Initial cost      
Land 855us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_RandolphNJMember
   
Building and Improvements 4,872us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_RandolphNJMember
   
Costs Subsequent to Acquisition 1,323cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_RandolphNJMember
   
Gross Carrying Amount at year end      
Land 1,108us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_RandolphNJMember
   
Building and Improvements 4,861us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_RandolphNJMember
   
Total 5,969cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_RandolphNJMember
   
Accumulated Depreciation 1,707cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_RandolphNJMember
   
Sewell, NJ      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 57,826us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SewellNJMember
   
Initial cost      
Land 484us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SewellNJMember
   
Building and Improvements 2,766us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SewellNJMember
   
Costs Subsequent to Acquisition 1,317cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SewellNJMember
   
Gross Carrying Amount at year end      
Land 706us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SewellNJMember
   
Building and Improvements 3,232us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SewellNJMember
   
Total 3,938cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SewellNJMember
   
Accumulated Depreciation 1,123cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SewellNJMember
   
Somerset, NJ      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 57,485us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SomersetNJMember
   
Initial cost      
Land 1,243us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SomersetNJMember
   
Building and Improvements 6,129us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SomersetNJMember
   
Costs Subsequent to Acquisition 71cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SomersetNJMember
   
Gross Carrying Amount at year end      
Land 1,243us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SomersetNJMember
   
Building and Improvements 6,199us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SomersetNJMember
   
Total 7,442cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SomersetNJMember
   
Accumulated Depreciation 295cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SomersetNJMember
   
Whippany, NJ      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 92,070us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WhippanyNJMember
   
Initial cost      
Land 2,153us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WhippanyNJMember
   
Building and Improvements 10,615us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WhippanyNJMember
   
Costs Subsequent to Acquisition 86cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WhippanyNJMember
   
Gross Carrying Amount at year end      
Land 2,153us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WhippanyNJMember
   
Building and Improvements 10,701us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WhippanyNJMember
   
Total 12,854cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WhippanyNJMember
   
Accumulated Depreciation 332cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WhippanyNJMember
   
Albuquerque I, NM      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 65,927us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AlbuquerqueINMMember
   
Initial cost      
Land 1,039us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AlbuquerqueINMMember
   
Building and Improvements 3,395us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AlbuquerqueINMMember
   
Costs Subsequent to Acquisition 273cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AlbuquerqueINMMember
   
Gross Carrying Amount at year end      
Land 1,039us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AlbuquerqueINMMember
   
Building and Improvements 3,084us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AlbuquerqueINMMember
   
Total 4,123cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AlbuquerqueINMMember
   
Accumulated Depreciation 879cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AlbuquerqueINMMember
   
Albuquerque II, NM      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 58,798us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AlbuquerqueIINMMember
   
Initial cost      
Land 1,163us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AlbuquerqueIINMMember
   
Building and Improvements 3,801us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AlbuquerqueIINMMember
   
Costs Subsequent to Acquisition 257cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AlbuquerqueIINMMember
   
Gross Carrying Amount at year end      
Land 1,163us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AlbuquerqueIINMMember
   
Building and Improvements 3,435us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AlbuquerqueIINMMember
   
Total 4,598cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AlbuquerqueIINMMember
   
Accumulated Depreciation 981cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AlbuquerqueIINMMember
   
Albuquerque III, NM      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 57,536us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AlbuquerqueIIINMMember
   
Initial cost      
Land 664us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AlbuquerqueIIINMMember
   
Building and Improvements 2,171us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AlbuquerqueIIINMMember
   
Costs Subsequent to Acquisition 334cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AlbuquerqueIIINMMember
   
Gross Carrying Amount at year end      
Land 664us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AlbuquerqueIIINMMember
   
Building and Improvements 2,117us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AlbuquerqueIIINMMember
   
Total 2,781cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AlbuquerqueIIINMMember
   
Accumulated Depreciation 592cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AlbuquerqueIIINMMember
   
Henderson, NV      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 75,150us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_HendersonNVMember
   
Initial cost      
Land 1,246us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_HendersonNVMember
   
Building and Improvements 6,143us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_HendersonNVMember
   
Costs Subsequent to Acquisition 1cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_HendersonNVMember
   
Gross Carrying Amount at year end      
Land 1,246us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_HendersonNVMember
   
Building and Improvements 6,143us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_HendersonNVMember
   
Total 7,389cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_HendersonNVMember
   
Accumulated Depreciation 33cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_HendersonNVMember
   
Las Vegas I, NV      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 48,332us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LasVegasINVMember
   
Initial cost      
Land 1,851us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LasVegasINVMember
   
Building and Improvements 2,986us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LasVegasINVMember
   
Costs Subsequent to Acquisition 486cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LasVegasINVMember
   
Gross Carrying Amount at year end      
Land 1,851us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LasVegasINVMember
   
Building and Improvements 3,061us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LasVegasINVMember
   
Total 4,912cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LasVegasINVMember
   
Accumulated Depreciation 874cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LasVegasINVMember
   
Las Vegas II, NV      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 48,850us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LasVegasIINVMember
   
Initial cost      
Land 3,354us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LasVegasIINVMember
   
Building and Improvements 5,411us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LasVegasIINVMember
   
Costs Subsequent to Acquisition 306cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LasVegasIINVMember
   
Gross Carrying Amount at year end      
Land 3,355us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LasVegasIINVMember
   
Building and Improvements 5,136us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LasVegasIINVMember
   
Total 8,491cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LasVegasIINVMember
   
Accumulated Depreciation 1,515cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LasVegasIINVMember
   
Bronx I, NY      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 69,308us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BronxINYMember
   
Initial cost      
Land 2,014us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BronxINYMember
   
Building and Improvements 11,411us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BronxINYMember
   
Costs Subsequent to Acquisition 738cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BronxINYMember
   
Gross Carrying Amount at year end      
Land 2,014us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BronxINYMember
   
Building and Improvements 10,556us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BronxINYMember
   
Total 12,570cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BronxINYMember
   
Accumulated Depreciation 1,172cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BronxINYMember
   
Bronx II, NY      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 90,170us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BronxIINYMember
   
Initial cost      
Building and Improvements 31,561us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BronxIINYMember
   
Costs Subsequent to Acquisition 92cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BronxIINYMember
   
Gross Carrying Amount at year end      
Building and Improvements 31,118us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BronxIINYMember
   
Total 31,118cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BronxIINYMember
   
Accumulated Depreciation 1,914cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BronxIINYMember
   
Bronx III, NY      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 106,065us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BronxIIINYMember
   
Initial cost      
Land 6,017us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BronxIIINYMember
   
Building and Improvements 33,999us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BronxIIINYMember
   
Costs Subsequent to Acquisition 142cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BronxIIINYMember
   
Gross Carrying Amount at year end      
Land 6,017us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BronxIIINYMember
   
Building and Improvements 29,794us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BronxIIINYMember
   
Total 35,811cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BronxIIINYMember
   
Accumulated Depreciation 2,588cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BronxIIINYMember
   
Bronx IV, NY      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 75,030us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BronxIVNYMember
   
Initial cost      
Building and Improvements 22,830us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BronxIVNYMember
   
Costs Subsequent to Acquisition 96cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BronxIVNYMember
   
Gross Carrying Amount at year end      
Building and Improvements 20,272us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BronxIVNYMember
   
Total 20,272cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BronxIVNYMember
   
Accumulated Depreciation 1,442cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BronxIVNYMember
   
Bronx V, NY      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 54,733us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BronxVNYMember
   
Initial cost      
Building and Improvements 17,564us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BronxVNYMember
   
Costs Subsequent to Acquisition 157cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BronxVNYMember
   
Gross Carrying Amount at year end      
Building and Improvements 15,610us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BronxVNYMember
   
Total 15,610cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BronxVNYMember
   
Accumulated Depreciation 1,192cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BronxVNYMember
   
Bronx VI, NY      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 46,020us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BronxVINYMember
   
Initial cost      
Building and Improvements 15,095us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BronxVINYMember
   
Costs Subsequent to Acquisition 327cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BronxVINYMember
   
Gross Carrying Amount at year end      
Building and Improvements 13,391us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BronxVINYMember
   
Total 13,391cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BronxVINYMember
   
Accumulated Depreciation 1,249cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BronxVINYMember
   
Bronx VII, NY      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 78,625us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BronxVIINYMember
   
Encumbrances 8,780us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BronxVIINYMember
   
Initial cost      
Building and Improvements 22,512us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BronxVIINYMember
   
Costs Subsequent to Acquisition 67cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BronxVIINYMember
   
Gross Carrying Amount at year end      
Building and Improvements 22,688us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BronxVIINYMember
   
Total 22,688cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BronxVIINYMember
   
Accumulated Depreciation 1,501cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BronxVIINYMember
   
Bronx VIII, NY      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 30,550us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BronxVIIINYMember
   
Encumbrances 3,082us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BronxVIIINYMember
   
Initial cost      
Land 1,245us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BronxVIIINYMember
   
Building and Improvements 6,137us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BronxVIIINYMember
   
Costs Subsequent to Acquisition 128cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BronxVIIINYMember
   
Gross Carrying Amount at year end      
Land 1,251us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BronxVIIINYMember
   
Building and Improvements 6,295us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BronxVIIINYMember
   
Total 7,546cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BronxVIIINYMember
   
Accumulated Depreciation 412cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BronxVIIINYMember
   
Bronx IX, NY      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 147,720us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BronxIXNYMember
   
Encumbrances 23,767us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BronxIXNYMember
   
Initial cost      
Land 7,967us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BronxIXNYMember
   
Building and Improvements 39,279us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BronxIXNYMember
   
Costs Subsequent to Acquisition 847cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BronxIXNYMember
   
Gross Carrying Amount at year end      
Land 7,967us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BronxIXNYMember
   
Building and Improvements 40,124us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BronxIXNYMember
   
Total 48,091cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BronxIXNYMember
   
Accumulated Depreciation 2,447cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BronxIXNYMember
   
Bronx X, NY      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 159,780us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BronxXNYMember
   
Encumbrances 27,873us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BronxXNYMember
   
Initial cost      
Land 9,090us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BronxXNYMember
   
Building and Improvements 44,816us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BronxXNYMember
   
Costs Subsequent to Acquisition 270cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BronxXNYMember
   
Gross Carrying Amount at year end      
Land 9,090us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BronxXNYMember
   
Building and Improvements 45,086us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BronxXNYMember
   
Total 54,176cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BronxXNYMember
   
Accumulated Depreciation 2,402cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BronxXNYMember
   
Bronx XI, NY      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 46,902us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BronxXINYMember
   
Initial cost      
Building and Improvements 17,130us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BronxXINYMember
   
Costs Subsequent to Acquisition 11cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BronxXINYMember
   
Gross Carrying Amount at year end      
Building and Improvements 17,141us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BronxXINYMember
   
Total 17,141cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BronxXINYMember
   
Accumulated Depreciation 115cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BronxXINYMember
   
Brooklyn I, NY      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 57,500us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BrooklynINYMember
   
Initial cost      
Land 1,795us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BrooklynINYMember
   
Building and Improvements 10,172us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BrooklynINYMember
   
Costs Subsequent to Acquisition 247cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BrooklynINYMember
   
Gross Carrying Amount at year end      
Land 1,795us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BrooklynINYMember
   
Building and Improvements 9,002us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BrooklynINYMember
   
Total 10,797cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BrooklynINYMember
   
Accumulated Depreciation 997cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BrooklynINYMember
   
Brooklyn II, NY      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 60,920us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BrooklynIINYMember
   
Initial cost      
Land 1,601us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BrooklynIINYMember
   
Building and Improvements 9,073us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BrooklynIINYMember
   
Costs Subsequent to Acquisition 438cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BrooklynIINYMember
   
Gross Carrying Amount at year end      
Land 1,601us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BrooklynIINYMember
   
Building and Improvements 8,213us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BrooklynIINYMember
   
Total 9,814cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BrooklynIINYMember
   
Accumulated Depreciation 905cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BrooklynIINYMember
   
Brooklyn III, NY      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 41,585us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BrooklynIIINYMember
   
Initial cost      
Land 3,195us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BrooklynIIINYMember
   
Building and Improvements 15,657us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BrooklynIIINYMember
   
Costs Subsequent to Acquisition 75cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BrooklynIIINYMember
   
Gross Carrying Amount at year end      
Land 3,195us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BrooklynIIINYMember
   
Building and Improvements 15,814us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BrooklynIIINYMember
   
Total 19,009cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BrooklynIIINYMember
   
Accumulated Depreciation 911cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BrooklynIIINYMember
   
Brooklyn IV, NY      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 37,467us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BrooklynIVNYMember
   
Initial cost      
Land 2,500us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BrooklynIVNYMember
   
Building and Improvements 12,252us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BrooklynIVNYMember
   
Costs Subsequent to Acquisition 130cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BrooklynIVNYMember
   
Gross Carrying Amount at year end      
Land 2,500us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BrooklynIVNYMember
   
Building and Improvements 12,445us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BrooklynIVNYMember
   
Total 14,945cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BrooklynIVNYMember
   
Accumulated Depreciation 799cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BrooklynIVNYMember
   
Brooklyn V, NY      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 47,010us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BrooklynVNYMember
   
Initial cost      
Land 2,207us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BrooklynVNYMember
   
Building and Improvements 10,814us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BrooklynVNYMember
   
Costs Subsequent to Acquisition 79cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BrooklynVNYMember
   
Gross Carrying Amount at year end      
Land 2,207us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BrooklynVNYMember
   
Building and Improvements 10,947us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BrooklynVNYMember
   
Total 13,154cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BrooklynVNYMember
   
Accumulated Depreciation 953cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BrooklynVNYMember
   
Brooklyn VI, NY      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 75,640us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BrooklynVINYMember
   
Initial cost      
Land 4,016us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BrooklynVINYMember
   
Building and Improvements 19,680us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BrooklynVINYMember
   
Costs Subsequent to Acquisition 69cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BrooklynVINYMember
   
Gross Carrying Amount at year end      
Land 4,016us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BrooklynVINYMember
   
Building and Improvements 19,856us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BrooklynVINYMember
   
Total 23,872cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BrooklynVINYMember
   
Accumulated Depreciation 1,655cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BrooklynVINYMember
   
Brooklyn VII, NY      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 72,685us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BrooklynVIINYMember
   
Initial cost      
Land 5,816us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BrooklynVIINYMember
   
Building and Improvements 28,498us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BrooklynVIINYMember
   
Costs Subsequent to Acquisition 98cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BrooklynVIINYMember
   
Gross Carrying Amount at year end      
Land 5,816us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BrooklynVIINYMember
   
Building and Improvements 28,761us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BrooklynVIINYMember
   
Total 34,577cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BrooklynVIINYMember
   
Accumulated Depreciation 2,052cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BrooklynVIINYMember
   
Brooklyn VIII, NY      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 61,075us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BrooklynVIIINYMember
   
Initial cost      
Land 4,982us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BrooklynVIIINYMember
   
Building and Improvements 24,561us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BrooklynVIIINYMember
   
Costs Subsequent to Acquisition 26cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BrooklynVIIINYMember
   
Gross Carrying Amount at year end      
Land 4,982us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BrooklynVIIINYMember
   
Building and Improvements 24,586us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BrooklynVIIINYMember
   
Total 29,568cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BrooklynVIIINYMember
   
Accumulated Depreciation 196cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BrooklynVIIINYMember
   
Brooklyn IX, NY      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 46,980us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BrooklynIXNYMember
   
Initial cost      
Land 2,966us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BrooklynIXNYMember
   
Building and Improvements 14,620us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BrooklynIXNYMember
   
Costs Subsequent to Acquisition 25cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BrooklynIXNYMember
   
Gross Carrying Amount at year end      
Land 2,966us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BrooklynIXNYMember
   
Building and Improvements 14,645us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BrooklynIXNYMember
   
Total 17,611cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BrooklynIXNYMember
   
Accumulated Depreciation 117cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BrooklynIXNYMember
   
Jamaica I, NY      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 88,385us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_JamaicaINYMember
   
Initial cost      
Land 2,043us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_JamaicaINYMember
   
Building and Improvements 11,658us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_JamaicaINYMember
   
Costs Subsequent to Acquisition 1,614cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_JamaicaINYMember
   
Gross Carrying Amount at year end      
Land 2,043us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_JamaicaINYMember
   
Building and Improvements 10,648us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_JamaicaINYMember
   
Total 12,691cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_JamaicaINYMember
   
Accumulated Depreciation 3,949cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_JamaicaINYMember
   
Jamaica II, NY      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 91,245us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_JamaicaIINYMember
   
Initial cost      
Land 5,496us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_JamaicaIINYMember
   
Building and Improvements 26,930us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_JamaicaIINYMember
   
Costs Subsequent to Acquisition 121cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_JamaicaIINYMember
   
Gross Carrying Amount at year end      
Land 5,496us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_JamaicaIINYMember
   
Building and Improvements 27,194us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_JamaicaIINYMember
   
Total 32,690cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_JamaicaIINYMember
   
Accumulated Depreciation 2,006cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_JamaicaIINYMember
   
Long Island City, NY      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 89,125us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LongIslandCityNYMember
   
Initial cost      
Land 5,700us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LongIslandCityNYMember
   
Building and Improvements 28,101us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LongIslandCityNYMember
   
Costs Subsequent to Acquisition 1cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LongIslandCityNYMember
   
Gross Carrying Amount at year end      
Land 5,700us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LongIslandCityNYMember
   
Building and Improvements 28,102us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LongIslandCityNYMember
   
Total 33,802cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LongIslandCityNYMember
   
Accumulated Depreciation 74cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LongIslandCityNYMember
   
New Rochelle I, NY      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 46,037us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NewRochelleINYMember
   
Initial cost      
Land 1,673us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NewRochelleINYMember
   
Building and Improvements 4,827us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NewRochelleINYMember
   
Costs Subsequent to Acquisition 667cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NewRochelleINYMember
   
Gross Carrying Amount at year end      
Land 1,673us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NewRochelleINYMember
   
Building and Improvements 4,846us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NewRochelleINYMember
   
Total 6,519cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NewRochelleINYMember
   
Accumulated Depreciation 1,179cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NewRochelleINYMember
   
New Rochelle II, NY      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 63,145us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NewRochelleIINYMember
   
Initial cost      
Land 3,167us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NewRochelleIINYMember
   
Building and Improvements 2,713us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NewRochelleIINYMember
   
Costs Subsequent to Acquisition 276cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NewRochelleIINYMember
   
Gross Carrying Amount at year end      
Land 3,762us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NewRochelleIINYMember
   
Building and Improvements 18,822us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NewRochelleIINYMember
   
Total 22,584cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NewRochelleIINYMember
   
Accumulated Depreciation 1,206cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NewRochelleIINYMember
   
North Babylon, NY      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 78,341us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NorthBabylonNYMember
   
Initial cost      
Land 225us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NorthBabylonNYMember
   
Building and Improvements 2,514us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NorthBabylonNYMember
   
Costs Subsequent to Acquisition 4,080cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NorthBabylonNYMember
   
Gross Carrying Amount at year end      
Land 568us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NorthBabylonNYMember
   
Building and Improvements 5,496us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NorthBabylonNYMember
   
Total 6,064cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NorthBabylonNYMember
   
Accumulated Depreciation 2,423cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NorthBabylonNYMember
   
Patchogue, NY      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 47,739us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PatchogueNYMember
   
Initial cost      
Land 1,141us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PatchogueNYMember
   
Building and Improvements 5,624us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PatchogueNYMember
   
Costs Subsequent to Acquisition 1cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PatchogueNYMember
   
Gross Carrying Amount at year end      
Land 1,141us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PatchogueNYMember
   
Building and Improvements 5,625us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PatchogueNYMember
   
Total 6,766cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PatchogueNYMember
   
Accumulated Depreciation 30cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PatchogueNYMember
   
Riverhead, NY      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 38,340us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_RiverheadNYMember
   
Initial cost      
Land 1,068us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_RiverheadNYMember
   
Building and Improvements 1,149us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_RiverheadNYMember
   
Costs Subsequent to Acquisition 195cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_RiverheadNYMember
   
Gross Carrying Amount at year end      
Land 1,068us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_RiverheadNYMember
   
Building and Improvements 1,111us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_RiverheadNYMember
   
Total 2,179cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_RiverheadNYMember
   
Accumulated Depreciation 342cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_RiverheadNYMember
   
Southold, NY      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 59,595us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SoutholdNYMember
   
Initial cost      
Land 2,079us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SoutholdNYMember
   
Building and Improvements 2,238us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SoutholdNYMember
   
Costs Subsequent to Acquisition 260cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SoutholdNYMember
   
Gross Carrying Amount at year end      
Land 2,079us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SoutholdNYMember
   
Building and Improvements 2,094us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SoutholdNYMember
   
Total 4,173cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SoutholdNYMember
   
Accumulated Depreciation 653cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SoutholdNYMember
   
Staten Island, NY      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 96,623us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_StatenIslandNYMember
   
Initial cost      
Land 1,919us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_StatenIslandNYMember
   
Building and Improvements 9,463us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_StatenIslandNYMember
   
Costs Subsequent to Acquisition 53cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_StatenIslandNYMember
   
Gross Carrying Amount at year end      
Land 1,919us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_StatenIslandNYMember
   
Building and Improvements 9,517us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_StatenIslandNYMember
   
Total 11,436cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_StatenIslandNYMember
   
Accumulated Depreciation 784cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_StatenIslandNYMember
   
Tuckahoe, NY      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 51,343us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TuckahoeNYMember
   
Initial cost      
Land 1,516us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TuckahoeNYMember
   
Building and Improvements 13,236us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TuckahoeNYMember
   
Costs Subsequent to Acquisition 168cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TuckahoeNYMember
   
Gross Carrying Amount at year end      
Land 1,516us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TuckahoeNYMember
   
Building and Improvements 7,633us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TuckahoeNYMember
   
Total 9,149cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TuckahoeNYMember
   
Accumulated Depreciation 1,179cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_TuckahoeNYMember
   
West Hempstead, NY      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 84,457us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WestHempsteadNYMember
   
Initial cost      
Land 2,237us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WestHempsteadNYMember
   
Building and Improvements 11,030us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WestHempsteadNYMember
   
Costs Subsequent to Acquisition 113cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WestHempsteadNYMember
   
Gross Carrying Amount at year end      
Land 2,237us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WestHempsteadNYMember
   
Building and Improvements 11,142us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WestHempsteadNYMember
   
Total 13,379cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WestHempsteadNYMember
   
Accumulated Depreciation 534cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WestHempsteadNYMember
   
White Plains, NY      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 86,465us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WhitePlainsNYMember
   
Initial cost      
Land 3,295us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WhitePlainsNYMember
   
Building and Improvements 18,049us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WhitePlainsNYMember
   
Costs Subsequent to Acquisition 835cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WhitePlainsNYMember
   
Gross Carrying Amount at year end      
Land 3,295us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WhitePlainsNYMember
   
Building and Improvements 16,393us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WhitePlainsNYMember
   
Total 19,688cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WhitePlainsNYMember
   
Accumulated Depreciation 1,521cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WhitePlainsNYMember
   
Woodhaven, NY      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 50,665us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WoodhavenNYMember
   
Initial cost      
Land 2,028us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WoodhavenNYMember
   
Building and Improvements 11,285us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WoodhavenNYMember
   
Costs Subsequent to Acquisition 56cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WoodhavenNYMember
   
Gross Carrying Amount at year end      
Land 2,028us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WoodhavenNYMember
   
Building and Improvements 10,044us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WoodhavenNYMember
   
Total 12,072cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WoodhavenNYMember
   
Accumulated Depreciation 759cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WoodhavenNYMember
   
Wyckoff, NY      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 61,565us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WyckoffNYMember
   
Initial cost      
Land 1,961us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WyckoffNYMember
   
Building and Improvements 11,113us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WyckoffNYMember
   
Costs Subsequent to Acquisition 218cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WyckoffNYMember
   
Gross Carrying Amount at year end      
Land 1,961us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WyckoffNYMember
   
Building and Improvements 9,849us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WyckoffNYMember
   
Total 11,810cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WyckoffNYMember
   
Accumulated Depreciation 1,013cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WyckoffNYMember
   
Yorktown, NY      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 78,595us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_YorktownNYMember
   
Initial cost      
Land 2,710us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_YorktownNYMember
   
Building and Improvements 13,338us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_YorktownNYMember
   
Costs Subsequent to Acquisition 126cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_YorktownNYMember
   
Gross Carrying Amount at year end      
Land 2,710us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_YorktownNYMember
   
Building and Improvements 13,477us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_YorktownNYMember
   
Total 16,187cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_YorktownNYMember
   
Accumulated Depreciation 795cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_YorktownNYMember
   
Cleveland I, OH      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 46,000us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ClevelandIOHMember
   
Initial cost      
Land 525us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ClevelandIOHMember
   
Building and Improvements 2,592us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ClevelandIOHMember
   
Costs Subsequent to Acquisition 175cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ClevelandIOHMember
   
Gross Carrying Amount at year end      
Land 524us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ClevelandIOHMember
   
Building and Improvements 2,419us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ClevelandIOHMember
   
Total 2,943cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ClevelandIOHMember
   
Accumulated Depreciation 690cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ClevelandIOHMember
   
Cleveland II, OH      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 58,325us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ClevelandIIOHMember
   
Initial cost      
Land 290us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ClevelandIIOHMember
   
Building and Improvements 1,427us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ClevelandIIOHMember
   
Costs Subsequent to Acquisition 177cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ClevelandIIOHMember
   
Gross Carrying Amount at year end      
Land 289us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ClevelandIIOHMember
   
Building and Improvements 1,353us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ClevelandIIOHMember
   
Total 1,642cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ClevelandIIOHMember
   
Accumulated Depreciation 391cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ClevelandIIOHMember
   
Columbus I, OH      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 71,905us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ColumbusIOHMember
   
Initial cost      
Land 1,234us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ColumbusIOHMember
   
Building and Improvements 3,151us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ColumbusIOHMember
   
Costs Subsequent to Acquisition 69cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ColumbusIOHMember
   
Gross Carrying Amount at year end      
Land 1,239us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ColumbusIOHMember
   
Building and Improvements 2,745us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ColumbusIOHMember
   
Total 3,984cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ColumbusIOHMember
   
Accumulated Depreciation 715cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ColumbusIOHMember
   
Columbus II, OH      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 36,844us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ColumbusIIOHMember
   
Initial cost      
Land 769us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ColumbusIIOHMember
   
Building and Improvements 3,788us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ColumbusIIOHMember
   
Costs Subsequent to Acquisition 1cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ColumbusIIOHMember
   
Gross Carrying Amount at year end      
Land 769us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ColumbusIIOHMember
   
Building and Improvements 3,788us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ColumbusIIOHMember
   
Total 4,557cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ColumbusIIOHMember
   
Accumulated Depreciation 20cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ColumbusIIOHMember
   
Columbus III, OH      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 51,400us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ColumbusIIIOHMember
   
Initial cost      
Land 326us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ColumbusIIIOHMember
   
Building and Improvements 1,607us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ColumbusIIIOHMember
   
Costs Subsequent to Acquisition 1cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ColumbusIIIOHMember
   
Gross Carrying Amount at year end      
Land 326us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ColumbusIIIOHMember
   
Building and Improvements 1,608us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ColumbusIIIOHMember
   
Total 1,934cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ColumbusIIIOHMember
   
Accumulated Depreciation 9cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ColumbusIIIOHMember
   
Columbus IV, OH      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 60,575us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ColumbusIVOHMember
   
Initial cost      
Land 443us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ColumbusIVOHMember
   
Building and Improvements 2,182us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ColumbusIVOHMember
   
Costs Subsequent to Acquisition 1cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ColumbusIVOHMember
   
Gross Carrying Amount at year end      
Land 443us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ColumbusIVOHMember
   
Building and Improvements 2,183us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ColumbusIVOHMember
   
Total 2,626cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ColumbusIVOHMember
   
Accumulated Depreciation 12cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ColumbusIVOHMember
   
Columbus V, OH      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 60,925us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ColumbusVOHMember
   
Initial cost      
Land 838us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ColumbusVOHMember
   
Building and Improvements 4,128us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ColumbusVOHMember
   
Costs Subsequent to Acquisition 1cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ColumbusVOHMember
   
Gross Carrying Amount at year end      
Land 838us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ColumbusVOHMember
   
Building and Improvements 4,129us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ColumbusVOHMember
   
Total 4,967cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ColumbusVOHMember
   
Accumulated Depreciation 22cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ColumbusVOHMember
   
Columbus VI, OH      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 63,725us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ColumbusVIOHMember
   
Initial cost      
Land 701us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ColumbusVIOHMember
   
Building and Improvements 3,454us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ColumbusVIOHMember
   
Costs Subsequent to Acquisition 1cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ColumbusVIOHMember
   
Gross Carrying Amount at year end      
Land 701us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ColumbusVIOHMember
   
Building and Improvements 3,455us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ColumbusVIOHMember
   
Total 4,156cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ColumbusVIOHMember
   
Accumulated Depreciation 18cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ColumbusVIOHMember
   
Grove City, OH      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 89,290us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_GroveCityOHMember
   
Initial cost      
Land 1,756us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_GroveCityOHMember
   
Building and Improvements 4,485us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_GroveCityOHMember
   
Costs Subsequent to Acquisition 177cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_GroveCityOHMember
   
Gross Carrying Amount at year end      
Land 1,761us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_GroveCityOHMember
   
Building and Improvements 4,044us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_GroveCityOHMember
   
Total 5,805cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_GroveCityOHMember
   
Accumulated Depreciation 1,018cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_GroveCityOHMember
   
Hilliard, OH      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 89,190us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_HilliardOHMember
   
Initial cost      
Land 1,361us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_HilliardOHMember
   
Building and Improvements 3,476us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_HilliardOHMember
   
Costs Subsequent to Acquisition 222cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_HilliardOHMember
   
Gross Carrying Amount at year end      
Land 1,366us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_HilliardOHMember
   
Building and Improvements 3,210us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_HilliardOHMember
   
Total 4,576cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_HilliardOHMember
   
Accumulated Depreciation 804cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_HilliardOHMember
   
Lakewood, OH      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 39,332us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LakewoodOHMember
   
Initial cost      
Land 405us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LakewoodOHMember
   
Building and Improvements 854us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LakewoodOHMember
   
Costs Subsequent to Acquisition 560cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LakewoodOHMember
   
Gross Carrying Amount at year end      
Land 405us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LakewoodOHMember
   
Building and Improvements 1,281us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LakewoodOHMember
   
Total 1,686cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LakewoodOHMember
   
Accumulated Depreciation 859cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LakewoodOHMember
   
Lewis Center, OH      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 80,830us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LewisCenterOHMember
   
Initial cost      
Land 1,056us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LewisCenterOHMember
   
Building and Improvements 5,206us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LewisCenterOHMember
   
Costs Subsequent to Acquisition 1cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LewisCenterOHMember
   
Gross Carrying Amount at year end      
Land 1,056us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LewisCenterOHMember
   
Building and Improvements 5,207us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LewisCenterOHMember
   
Total 6,263cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LewisCenterOHMember
   
Accumulated Depreciation 28cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LewisCenterOHMember
   
Middleburg Heights, OH      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 93,200us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MiddleburgHeightsOHMember
   
Initial cost      
Land 63us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MiddleburgHeightsOHMember
   
Building and Improvements 704us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MiddleburgHeightsOHMember
   
Costs Subsequent to Acquisition 2,179cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MiddleburgHeightsOHMember
   
Gross Carrying Amount at year end      
Land 332us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MiddleburgHeightsOHMember
   
Building and Improvements 2,271us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MiddleburgHeightsOHMember
   
Total 2,603cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MiddleburgHeightsOHMember
   
Accumulated Depreciation 1,037cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MiddleburgHeightsOHMember
   
North Olmsted I, OH      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 48,665us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NorthOlmstedIOHMember
   
Initial cost      
Land 63us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NorthOlmstedIOHMember
   
Building and Improvements 704us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NorthOlmstedIOHMember
   
Costs Subsequent to Acquisition 1,350cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NorthOlmstedIOHMember
   
Gross Carrying Amount at year end      
Land 214us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NorthOlmstedIOHMember
   
Building and Improvements 1,613us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NorthOlmstedIOHMember
   
Total 1,827cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NorthOlmstedIOHMember
   
Accumulated Depreciation 804cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NorthOlmstedIOHMember
   
North Olmsted II, OH      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 47,850us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NorthOlmstedIIOHMember
   
Initial cost      
Land 290us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NorthOlmstedIIOHMember
   
Building and Improvements 1,129us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NorthOlmstedIIOHMember
   
Costs Subsequent to Acquisition 1,135cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NorthOlmstedIIOHMember
   
Gross Carrying Amount at year end      
Land 469us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NorthOlmstedIIOHMember
   
Building and Improvements 1,997us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NorthOlmstedIIOHMember
   
Total 2,466cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NorthOlmstedIIOHMember
   
Accumulated Depreciation 1,353cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NorthOlmstedIIOHMember
   
North Randall, OH      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 80,239us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NorthRandallOHMember
   
Initial cost      
Land 515us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NorthRandallOHMember
   
Building and Improvements 2,323us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NorthRandallOHMember
   
Costs Subsequent to Acquisition 3,071cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NorthRandallOHMember
   
Gross Carrying Amount at year end      
Land 898us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NorthRandallOHMember
   
Building and Improvements 4,149us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NorthRandallOHMember
   
Total 5,047cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NorthRandallOHMember
   
Accumulated Depreciation 1,756cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NorthRandallOHMember
   
Reynoldsburg, OH      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 67,245us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ReynoldsburgOHMember
   
Initial cost      
Land 1,290us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ReynoldsburgOHMember
   
Building and Improvements 3,295us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ReynoldsburgOHMember
   
Costs Subsequent to Acquisition 251cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ReynoldsburgOHMember
   
Gross Carrying Amount at year end      
Land 1,295us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ReynoldsburgOHMember
   
Building and Improvements 3,092us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ReynoldsburgOHMember
   
Total 4,387cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ReynoldsburgOHMember
   
Accumulated Depreciation 792cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ReynoldsburgOHMember
   
Strongsville, OH      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 43,683us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_StrongsvilleOHMember
   
Initial cost      
Land 570us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_StrongsvilleOHMember
   
Building and Improvements 3,486us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_StrongsvilleOHMember
   
Costs Subsequent to Acquisition 336cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_StrongsvilleOHMember
   
Gross Carrying Amount at year end      
Land 570us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_StrongsvilleOHMember
   
Building and Improvements 2,989us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_StrongsvilleOHMember
   
Total 3,559cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_StrongsvilleOHMember
   
Accumulated Depreciation 622cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_StrongsvilleOHMember
   
Warrensville Heights, OH      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 90,281us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WarrensvilleHeightsOHMember
   
Initial cost      
Land 525us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WarrensvilleHeightsOHMember
   
Building and Improvements 766us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WarrensvilleHeightsOHMember
   
Costs Subsequent to Acquisition 2,925cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WarrensvilleHeightsOHMember
   
Gross Carrying Amount at year end      
Land 935us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WarrensvilleHeightsOHMember
   
Building and Improvements 3,103us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WarrensvilleHeightsOHMember
   
Total 4,038cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WarrensvilleHeightsOHMember
   
Accumulated Depreciation 1,248cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WarrensvilleHeightsOHMember
   
Westlake, OH      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 62,750us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WestlakeOHMember
   
Initial cost      
Land 509us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WestlakeOHMember
   
Building and Improvements 2,508us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WestlakeOHMember
   
Costs Subsequent to Acquisition 202cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WestlakeOHMember
   
Gross Carrying Amount at year end      
Land 508us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WestlakeOHMember
   
Building and Improvements 2,322us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WestlakeOHMember
   
Total 2,830cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WestlakeOHMember
   
Accumulated Depreciation 680cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WestlakeOHMember
   
Conshohocken, PA      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 81,255us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ConshohockenPAMember
   
Initial cost      
Land 1,726us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ConshohockenPAMember
   
Building and Improvements 8,508us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ConshohockenPAMember
   
Costs Subsequent to Acquisition 103cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ConshohockenPAMember
   
Gross Carrying Amount at year end      
Land 1,726us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ConshohockenPAMember
   
Building and Improvements 8,611us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ConshohockenPAMember
   
Total 10,337cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ConshohockenPAMember
   
Accumulated Depreciation 415cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ConshohockenPAMember
   
Exton, PA      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 57,750us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ExtonPAMember
   
Initial cost      
Land 541us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ExtonPAMember
   
Building and Improvements 2,668us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ExtonPAMember
   
Costs Subsequent to Acquisition 110cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ExtonPAMember
   
Gross Carrying Amount at year end      
Land 541us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ExtonPAMember
   
Building and Improvements 2,778us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ExtonPAMember
   
Total 3,319cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ExtonPAMember
   
Accumulated Depreciation 119cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ExtonPAMember
   
Langhorne, PA      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 65,050us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LanghornePAMember
   
Initial cost      
Land 1,019us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LanghornePAMember
   
Building and Improvements 5,023us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LanghornePAMember
   
Costs Subsequent to Acquisition 158cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LanghornePAMember
   
Gross Carrying Amount at year end      
Land 1,019us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LanghornePAMember
   
Building and Improvements 5,181us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LanghornePAMember
   
Total 6,200cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LanghornePAMember
   
Accumulated Depreciation 242cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LanghornePAMember
   
Levittown, PA      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 76,180us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LevittownPAMember
   
Initial cost      
Land 926us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LevittownPAMember
   
Building and Improvements 5,296us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LevittownPAMember
   
Costs Subsequent to Acquisition 1,160cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LevittownPAMember
   
Gross Carrying Amount at year end      
Land 926us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LevittownPAMember
   
Building and Improvements 5,444us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LevittownPAMember
   
Total 6,370cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LevittownPAMember
   
Accumulated Depreciation 2,014cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LevittownPAMember
   
Malvern, PA      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 18,848us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MalvernPAMember
   
Initial cost      
Land 2,959us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MalvernPAMember
   
Building and Improvements 18,198us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MalvernPAMember
   
Costs Subsequent to Acquisition 1,408cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MalvernPAMember
   
Gross Carrying Amount at year end      
Land 2,959us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MalvernPAMember
   
Building and Improvements 19,606us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MalvernPAMember
   
Total 22,565cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MalvernPAMember
   
Accumulated Depreciation 174cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MalvernPAMember
   
Montgomeryville, PA      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 84,145us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MontgomeryvillePAMember
   
Initial cost      
Land 975us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MontgomeryvillePAMember
   
Building and Improvements 4,809us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MontgomeryvillePAMember
   
Costs Subsequent to Acquisition 121cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MontgomeryvillePAMember
   
Gross Carrying Amount at year end      
Land 975us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MontgomeryvillePAMember
   
Building and Improvements 4,929us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MontgomeryvillePAMember
   
Total 5,904cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MontgomeryvillePAMember
   
Accumulated Depreciation 240cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MontgomeryvillePAMember
   
Norristown, PA      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 54,911us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NorristownPAMember
   
Initial cost      
Land 777us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NorristownPAMember
   
Building and Improvements 3,709us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NorristownPAMember
   
Costs Subsequent to Acquisition 567cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NorristownPAMember
   
Gross Carrying Amount at year end      
Land 777us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NorristownPAMember
   
Building and Improvements 4,381us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NorristownPAMember
   
Total 5,158cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NorristownPAMember
   
Accumulated Depreciation 253cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NorristownPAMember
   
Philadelphia I, PA      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 97,414us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PhiladelphiaIPaMember
   
Initial cost      
Land 1,461us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PhiladelphiaIPaMember
   
Building and Improvements 8,334us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PhiladelphiaIPaMember
   
Costs Subsequent to Acquisition 1,762cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PhiladelphiaIPaMember
   
Gross Carrying Amount at year end      
Land 1,461us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PhiladelphiaIPaMember
   
Building and Improvements 6,918us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PhiladelphiaIPaMember
   
Total 8,379cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PhiladelphiaIPaMember
   
Accumulated Depreciation 2,612cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PhiladelphiaIPaMember
   
Philadelphia II, PA      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 68,239us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PhiladelphiaIIPaMember
   
Initial cost      
Land 1,012us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PhiladelphiaIIPaMember
   
Building and Improvements 4,990us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PhiladelphiaIIPaMember
   
Costs Subsequent to Acquisition 68cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PhiladelphiaIIPaMember
   
Gross Carrying Amount at year end      
Land 1,012us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PhiladelphiaIIPaMember
   
Building and Improvements 5,057us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PhiladelphiaIIPaMember
   
Total 6,069cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PhiladelphiaIIPaMember
   
Accumulated Depreciation 41cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PhiladelphiaIIPaMember
   
Exeter, RI      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 41,275us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ExeterRIMember
   
Initial cost      
Land 547us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ExeterRIMember
   
Building and Improvements 2,697us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ExeterRIMember
   
Costs Subsequent to Acquisition 1cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ExeterRIMember
   
Gross Carrying Amount at year end      
Land 547us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ExeterRIMember
   
Building and Improvements 2,698us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ExeterRIMember
   
Total 3,245cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ExeterRIMember
   
Accumulated Depreciation 14cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ExeterRIMember
   
Johnston, RI      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 80,725us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_JohnstonRIMember
   
Initial cost      
Land 1,061us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_JohnstonRIMember
   
Building and Improvements 5,229us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_JohnstonRIMember
   
Costs Subsequent to Acquisition 1cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_JohnstonRIMember
   
Gross Carrying Amount at year end      
Land 1,061us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_JohnstonRIMember
   
Building and Improvements 5,231us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_JohnstonRIMember
   
Total 6,292cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_JohnstonRIMember
   
Accumulated Depreciation 28cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_JohnstonRIMember
   
Wakefield, RI      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 45,895us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WakefieldRIMember
   
Initial cost      
Land 823us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WakefieldRIMember
   
Building and Improvements 4,058us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WakefieldRIMember
   
Costs Subsequent to Acquisition 1cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WakefieldRIMember
   
Gross Carrying Amount at year end      
Land 823us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WakefieldRIMember
   
Building and Improvements 4,059us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WakefieldRIMember
   
Total 4,882cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WakefieldRIMember
   
Accumulated Depreciation 21cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WakefieldRIMember
   
Woonsocket, RI      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 72,704us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WoonsocketRIMember
   
Initial cost      
Land 1,049us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WoonsocketRIMember
   
Building and Improvements 5,172us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WoonsocketRIMember
   
Costs Subsequent to Acquisition 1cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WoonsocketRIMember
   
Gross Carrying Amount at year end      
Land 1,049us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WoonsocketRIMember
   
Building and Improvements 5,173us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WoonsocketRIMember
   
Total 6,222cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WoonsocketRIMember
   
Accumulated Depreciation 27cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_WoonsocketRIMember
   
Antioch, TN      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 76,190us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AntiochTNMember
   
Initial cost      
Land 588us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AntiochTNMember
   
Building and Improvements 4,906us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AntiochTNMember
   
Costs Subsequent to Acquisition 287cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AntiochTNMember
   
Gross Carrying Amount at year end      
Land 588us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AntiochTNMember
   
Building and Improvements 4,426us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AntiochTNMember
   
Total 5,014cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AntiochTNMember
   
Accumulated Depreciation 1,167cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AntiochTNMember
   
Nashville I, TN      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 103,840us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NashvilleITNMember
   
Initial cost      
Land 405us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NashvilleITNMember
   
Building and Improvements 3,379us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NashvilleITNMember
   
Costs Subsequent to Acquisition 469cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NashvilleITNMember
   
Gross Carrying Amount at year end      
Land 405us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NashvilleITNMember
   
Building and Improvements 3,270us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NashvilleITNMember
   
Total 3,675cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NashvilleITNMember
   
Accumulated Depreciation 884cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NashvilleITNMember
   
Nashville II, TN      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 83,384us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NashvilleIITNMember
   
Initial cost      
Land 593us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NashvilleIITNMember
   
Building and Improvements 4,950us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NashvilleIITNMember
   
Costs Subsequent to Acquisition 183cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NashvilleIITNMember
   
Gross Carrying Amount at year end      
Land 593us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NashvilleIITNMember
   
Building and Improvements 4,443us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NashvilleIITNMember
   
Total 5,036cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NashvilleIITNMember
   
Accumulated Depreciation 1,199cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NashvilleIITNMember
   
Nashville III, TN      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 101,575us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NashvilleIIITNMember
   
Initial cost      
Land 416us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NashvilleIIITNMember
   
Building and Improvements 3,469us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NashvilleIIITNMember
   
Costs Subsequent to Acquisition 191cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NashvilleIIITNMember
   
Gross Carrying Amount at year end      
Land 416us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NashvilleIIITNMember
   
Building and Improvements 3,328us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NashvilleIIITNMember
   
Total 3,744cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NashvilleIIITNMember
   
Accumulated Depreciation 873cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NashvilleIIITNMember
   
Nashville IV, TN      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 102,450us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NashvilleIVTNMember
   
Initial cost      
Land 992us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NashvilleIVTNMember
   
Building and Improvements 8,274us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NashvilleIVTNMember
   
Costs Subsequent to Acquisition 351cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NashvilleIVTNMember
   
Gross Carrying Amount at year end      
Land 992us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NashvilleIVTNMember
   
Building and Improvements 7,385us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NashvilleIVTNMember
   
Total 8,377cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NashvilleIVTNMember
   
Accumulated Depreciation 1,932cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NashvilleIVTNMember
   
Allen, TX      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 62,870us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AllenTXMember
   
Encumbrances 3,610us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AllenTXMember
   
Initial cost      
Land 714us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AllenTXMember
   
Building and Improvements 3,519us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AllenTXMember
   
Costs Subsequent to Acquisition 59cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AllenTXMember
   
Gross Carrying Amount at year end      
Land 714us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AllenTXMember
   
Building and Improvements 3,578us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AllenTXMember
   
Total 4,292cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AllenTXMember
   
Accumulated Depreciation 188cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AllenTXMember
   
Austin I, TX      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 59,620us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AustinITXMember
   
Initial cost      
Land 2,239us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AustinITXMember
   
Building and Improvements 2,038us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AustinITXMember
   
Costs Subsequent to Acquisition 152cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AustinITXMember
   
Gross Carrying Amount at year end      
Land 2,239us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AustinITXMember
   
Building and Improvements 1,865us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AustinITXMember
   
Total 4,104cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AustinITXMember
   
Accumulated Depreciation 499cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AustinITXMember
   
Austin II, TX      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 65,151us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AustinIITXMember
   
Initial cost      
Land 734us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AustinIITXMember
   
Building and Improvements 3,894us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AustinIITXMember
   
Costs Subsequent to Acquisition 245cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AustinIITXMember
   
Gross Carrying Amount at year end      
Land 738us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AustinIITXMember
   
Building and Improvements 3,577us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AustinIITXMember
   
Total 4,315cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AustinIITXMember
   
Accumulated Depreciation 882cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AustinIITXMember
   
Austin III, TX      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 70,560us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AustinIIITXMember
   
Initial cost      
Land 1,030us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AustinIIITXMember
   
Building and Improvements 5,468us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AustinIIITXMember
   
Costs Subsequent to Acquisition 224cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AustinIIITXMember
   
Gross Carrying Amount at year end      
Land 1,035us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AustinIIITXMember
   
Building and Improvements 5,032us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AustinIIITXMember
   
Total 6,067cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AustinIIITXMember
   
Accumulated Depreciation 1,175cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AustinIIITXMember
   
Austin IV, TX      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 65,370us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AustinIVTXMember
   
Initial cost      
Land 862us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AustinIVTXMember
   
Building and Improvements 4,250us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AustinIVTXMember
   
Costs Subsequent to Acquisition 106cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AustinIVTXMember
   
Gross Carrying Amount at year end      
Land 862us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AustinIVTXMember
   
Building and Improvements 4,356us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AustinIVTXMember
   
Total 5,218cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AustinIVTXMember
   
Accumulated Depreciation 35cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AustinIVTXMember
   
Austin V, TX      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 67,850us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AustinVTXMember
   
Initial cost      
Land 1,050us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AustinVTXMember
   
Building and Improvements 5,175us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AustinVTXMember
   
Costs Subsequent to Acquisition 1cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AustinVTXMember
   
Gross Carrying Amount at year end      
Land 1,050us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AustinVTXMember
   
Building and Improvements 5,176us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AustinVTXMember
   
Total 6,226cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AustinVTXMember
   
Accumulated Depreciation 41cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AustinVTXMember
   
Austin VI, TX      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 62,770us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AustinVITXMember
   
Initial cost      
Land 1,150us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AustinVITXMember
   
Building and Improvements 5,669us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AustinVITXMember
   
Costs Subsequent to Acquisition 2cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AustinVITXMember
   
Gross Carrying Amount at year end      
Land 1,150us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AustinVITXMember
   
Building and Improvements 5,671us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AustinVITXMember
   
Total 6,821cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AustinVITXMember
   
Accumulated Depreciation 30cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AustinVITXMember
   
Bryan, TX      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 60,400us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BryanTXMember
   
Initial cost      
Land 1,394us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BryanTXMember
   
Building and Improvements 1,268us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BryanTXMember
   
Costs Subsequent to Acquisition 146cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BryanTXMember
   
Gross Carrying Amount at year end      
Land 1,396us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BryanTXMember
   
Building and Improvements 1,194us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BryanTXMember
   
Total 2,590cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BryanTXMember
   
Accumulated Depreciation 327cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BryanTXMember
   
Carrollton, TX      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 77,140us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CarrolltonTXMember
   
Initial cost      
Land 661us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CarrolltonTXMember
   
Building and Improvements 3,261us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CarrolltonTXMember
   
Costs Subsequent to Acquisition 47cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CarrolltonTXMember
   
Gross Carrying Amount at year end      
Land 661us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CarrolltonTXMember
   
Building and Improvements 3,308us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CarrolltonTXMember
   
Total 3,969cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CarrolltonTXMember
   
Accumulated Depreciation 132cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CarrolltonTXMember
   
College Station, TX      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 26,550us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CollegeStationTXMember
   
Initial cost      
Land 812us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CollegeStationTXMember
   
Building and Improvements 740us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CollegeStationTXMember
   
Costs Subsequent to Acquisition 119cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CollegeStationTXMember
   
Gross Carrying Amount at year end      
Land 813us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CollegeStationTXMember
   
Building and Improvements 710us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CollegeStationTXMember
   
Total 1,523cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CollegeStationTXMember
   
Accumulated Depreciation 188cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CollegeStationTXMember
   
Cypress, TX      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 58,181us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CypressTXMember
   
Initial cost      
Land 360us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CypressTXMember
   
Building and Improvements 1,773us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CypressTXMember
   
Costs Subsequent to Acquisition 90cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CypressTXMember
   
Gross Carrying Amount at year end      
Land 360us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CypressTXMember
   
Building and Improvements 1,864us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CypressTXMember
   
Total 2,224cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CypressTXMember
   
Accumulated Depreciation 97cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_CypressTXMember
   
Dallas I, TX      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 58,582us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DallasITXMember
   
Initial cost      
Land 2,475us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DallasITXMember
   
Building and Improvements 2,253us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DallasITXMember
   
Costs Subsequent to Acquisition 332cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DallasITXMember
   
Gross Carrying Amount at year end      
Land 2,475us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DallasITXMember
   
Building and Improvements 2,138us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DallasITXMember
   
Total 4,613cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DallasITXMember
   
Accumulated Depreciation 559cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DallasITXMember
   
Dallas II, TX      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 79,123us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DallasIITXMember
   
Initial cost      
Land 940us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DallasIITXMember
   
Building and Improvements 4,635us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DallasIITXMember
   
Costs Subsequent to Acquisition 103cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DallasIITXMember
   
Gross Carrying Amount at year end      
Land 940us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DallasIITXMember
   
Building and Improvements 4,738us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DallasIITXMember
   
Total 5,678cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DallasIITXMember
   
Accumulated Depreciation 513cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DallasIITXMember
   
Dallas III, TX      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 69,589us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DallasIIITXMember
   
Initial cost      
Land 2,608us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DallasIIITXMember
   
Building and Improvements 12,857us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DallasIIITXMember
   
Costs Subsequent to Acquisition 1cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DallasIIITXMember
   
Gross Carrying Amount at year end      
Land 2,608us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DallasIIITXMember
   
Building and Improvements 12,858us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DallasIIITXMember
   
Total 15,466cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DallasIIITXMember
   
Accumulated Depreciation 34cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DallasIIITXMember
   
Denton, TX      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 60,846us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DentonTXMember
   
Initial cost      
Land 553us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DentonTXMember
   
Building and Improvements 2,936us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DentonTXMember
   
Costs Subsequent to Acquisition 199cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DentonTXMember
   
Gross Carrying Amount at year end      
Land 569us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DentonTXMember
   
Building and Improvements 2,645us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DentonTXMember
   
Total 3,214cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DentonTXMember
   
Accumulated Depreciation 630cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DentonTXMember
   
El Paso I, TX      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 59,852us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ElPasoITXMember
   
Initial cost      
Land 1,983us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ElPasoITXMember
   
Building and Improvements 1,805us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ElPasoITXMember
   
Costs Subsequent to Acquisition 261cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ElPasoITXMember
   
Gross Carrying Amount at year end      
Land 1,984us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ElPasoITXMember
   
Building and Improvements 1,737us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ElPasoITXMember
   
Total 3,721cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ElPasoITXMember
   
Accumulated Depreciation 464cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ElPasoITXMember
   
El Paso II, TX      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 48,800us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ElPasoIITXMember
   
Initial cost      
Land 1,319us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ElPasoIITXMember
   
Building and Improvements 1,201us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ElPasoIITXMember
   
Costs Subsequent to Acquisition 205cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ElPasoIITXMember
   
Gross Carrying Amount at year end      
Land 1,320us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ElPasoIITXMember
   
Building and Improvements 1,188us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ElPasoIITXMember
   
Total 2,508cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ElPasoIITXMember
   
Accumulated Depreciation 317cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ElPasoIITXMember
   
El Paso III, TX      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 71,102us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ElPasoIIITXMember
   
Initial cost      
Land 2,408us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ElPasoIIITXMember
   
Building and Improvements 2,192us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ElPasoIIITXMember
   
Costs Subsequent to Acquisition 216cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ElPasoIIITXMember
   
Gross Carrying Amount at year end      
Land 2,409us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ElPasoIIITXMember
   
Building and Improvements 2,075us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ElPasoIIITXMember
   
Total 4,484cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ElPasoIIITXMember
   
Accumulated Depreciation 558cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ElPasoIIITXMember
   
El Paso IV, TX      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 66,906us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ElPasoIVTXMember
   
Initial cost      
Land 2,073us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ElPasoIVTXMember
   
Building and Improvements 1,888us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ElPasoIVTXMember
   
Costs Subsequent to Acquisition 59cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ElPasoIVTXMember
   
Gross Carrying Amount at year end      
Land 2,074us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ElPasoIVTXMember
   
Building and Improvements 1,635us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ElPasoIVTXMember
   
Total 3,709cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ElPasoIVTXMember
   
Accumulated Depreciation 523cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ElPasoIVTXMember
   
El Paso V, TX      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 62,290us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ElPasoVTXMember
   
Initial cost      
Land 1,758us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ElPasoVTXMember
   
Building and Improvements 1,617us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ElPasoVTXMember
   
Costs Subsequent to Acquisition 157cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ElPasoVTXMember
   
Gross Carrying Amount at year end      
Land 1,761us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ElPasoVTXMember
   
Building and Improvements 1,514us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ElPasoVTXMember
   
Total 3,275cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ElPasoVTXMember
   
Accumulated Depreciation 410cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ElPasoVTXMember
   
El Paso VI, TX      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 36,620us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ElPasoVITXMember
   
Initial cost      
Land 660us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ElPasoVITXMember
   
Building and Improvements 607us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ElPasoVITXMember
   
Costs Subsequent to Acquisition 158cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ElPasoVITXMember
   
Gross Carrying Amount at year end      
Land 662us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ElPasoVITXMember
   
Building and Improvements 631us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ElPasoVITXMember
   
Total 1,293cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ElPasoVITXMember
   
Accumulated Depreciation 171cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ElPasoVITXMember
   
El Paso VII, TX      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 34,423us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ElPasoVIITXMember
   
Initial cost      
Land 563us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ElPasoVIITXMember
   
Building and Improvements 517us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ElPasoVIITXMember
   
Costs Subsequent to Acquisition 8cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ElPasoVIITXMember
   
Gross Carrying Amount at year end      
Land 565us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ElPasoVIITXMember
   
Building and Improvements 559us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ElPasoVIITXMember
   
Total 1,124cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ElPasoVIITXMember
   
Accumulated Depreciation 15cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ElPasoVIITXMember
   
Fort Worth I, TX      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 50,246us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FortWorthITXMember
   
Initial cost      
Land 1,253us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FortWorthITXMember
   
Building and Improvements 1,141us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FortWorthITXMember
   
Costs Subsequent to Acquisition 220cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FortWorthITXMember
   
Gross Carrying Amount at year end      
Land 1,253us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FortWorthITXMember
   
Building and Improvements 1,126us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FortWorthITXMember
   
Total 2,379cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FortWorthITXMember
   
Accumulated Depreciation 282cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FortWorthITXMember
   
Fort Worth II, TX      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 72,900us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FortWorthIITXMember
   
Initial cost      
Land 868us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FortWorthIITXMember
   
Building and Improvements 4,607us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FortWorthIITXMember
   
Costs Subsequent to Acquisition 292cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FortWorthIITXMember
   
Gross Carrying Amount at year end      
Land 874us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FortWorthIITXMember
   
Building and Improvements 4,232us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FortWorthIITXMember
   
Total 5,106cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FortWorthIITXMember
   
Accumulated Depreciation 1,034cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FortWorthIITXMember
   
Frisco I, TX      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 50,754us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FriscoITXMember
   
Initial cost      
Land 1,093us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FriscoITXMember
   
Building and Improvements 3,148us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FriscoITXMember
   
Costs Subsequent to Acquisition 131cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FriscoITXMember
   
Gross Carrying Amount at year end      
Land 1,093us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FriscoITXMember
   
Building and Improvements 2,841us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FriscoITXMember
   
Total 3,934cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FriscoITXMember
   
Accumulated Depreciation 744cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FriscoITXMember
   
Frisco II, TX      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 71,399us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FriscoIITXMember
   
Initial cost      
Land 1,564us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FriscoIITXMember
   
Building and Improvements 4,507us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FriscoIITXMember
   
Costs Subsequent to Acquisition 95cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FriscoIITXMember
   
Gross Carrying Amount at year end      
Land 1,564us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FriscoIITXMember
   
Building and Improvements 3,991us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FriscoIITXMember
   
Total 5,555cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FriscoIITXMember
   
Accumulated Depreciation 1,065cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FriscoIITXMember
   
Frisco III, TX      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 74,765us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FriscoIIITXMember
   
Initial cost      
Land 1,147us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FriscoIIITXMember
   
Building and Improvements 6,088us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FriscoIIITXMember
   
Costs Subsequent to Acquisition 242cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FriscoIIITXMember
   
Gross Carrying Amount at year end      
Land 1,154us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FriscoIIITXMember
   
Building and Improvements 5,525us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FriscoIIITXMember
   
Total 6,679cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FriscoIIITXMember
   
Accumulated Depreciation 1,354cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FriscoIIITXMember
   
Frisco IV, TX      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 75,035us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FriscoIVTXMember
   
Initial cost      
Land 719us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FriscoIVTXMember
   
Building and Improvements 4,072us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FriscoIVTXMember
   
Costs Subsequent to Acquisition 117cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FriscoIVTXMember
   
Gross Carrying Amount at year end      
Land 719us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FriscoIVTXMember
   
Building and Improvements 3,630us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FriscoIVTXMember
   
Total 4,349cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FriscoIVTXMember
   
Accumulated Depreciation 405cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FriscoIVTXMember
   
Frisco V, TX      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 74,490us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FriscoVTXMember
   
Initial cost      
Land 1,159us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FriscoVTXMember
   
Building and Improvements 5,714us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FriscoVTXMember
   
Costs Subsequent to Acquisition 16cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FriscoVTXMember
   
Gross Carrying Amount at year end      
Land 1,159us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FriscoVTXMember
   
Building and Improvements 5,729us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FriscoVTXMember
   
Total 6,888cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FriscoVTXMember
   
Accumulated Depreciation 46cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FriscoVTXMember
   
Frisco VI, TX      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 68,926us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FriscoVITXMember
   
Initial cost      
Land 1,064us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FriscoVITXMember
   
Building and Improvements 5,247us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FriscoVITXMember
   
Costs Subsequent to Acquisition 2cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FriscoVITXMember
   
Gross Carrying Amount at year end      
Land 1,064us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FriscoVITXMember
   
Building and Improvements 5,249us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FriscoVITXMember
   
Total 6,313cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FriscoVITXMember
   
Accumulated Depreciation 28cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FriscoVITXMember
   
Garland I, TX      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 70,100us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_GarlandITXMember
   
Initial cost      
Land 751us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_GarlandITXMember
   
Building and Improvements 3,984us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_GarlandITXMember
   
Costs Subsequent to Acquisition 419cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_GarlandITXMember
   
Gross Carrying Amount at year end      
Land 767us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_GarlandITXMember
   
Building and Improvements 3,817us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_GarlandITXMember
   
Total 4,584cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_GarlandITXMember
   
Accumulated Depreciation 916cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_GarlandITXMember
   
Garland II, TX      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 68,425us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_GarlandIITXMember
   
Initial cost      
Land 862us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_GarlandIITXMember
   
Building and Improvements 4,578us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_GarlandIITXMember
   
Costs Subsequent to Acquisition 206cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_GarlandIITXMember
   
Gross Carrying Amount at year end      
Land 862us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_GarlandIITXMember
   
Building and Improvements 4,187us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_GarlandIITXMember
   
Total 5,049cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_GarlandIITXMember
   
Accumulated Depreciation 943cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_GarlandIITXMember
   
Houston III, TX      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 60,820us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_HoustonIIITXMember
   
Initial cost      
Land 575us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_HoustonIIITXMember
   
Building and Improvements 524us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_HoustonIIITXMember
   
Costs Subsequent to Acquisition 287cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_HoustonIIITXMember
   
Gross Carrying Amount at year end      
Land 576us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_HoustonIIITXMember
   
Building and Improvements 699us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_HoustonIIITXMember
   
Total 1,275cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_HoustonIIITXMember
   
Accumulated Depreciation 196cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_HoustonIIITXMember
   
Houston IV, TX      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 43,750us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_HoustonIVTXMember
   
Initial cost      
Land 960us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_HoustonIVTXMember
   
Building and Improvements 875us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_HoustonIVTXMember
   
Costs Subsequent to Acquisition 371cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_HoustonIVTXMember
   
Gross Carrying Amount at year end      
Land 961us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_HoustonIVTXMember
   
Building and Improvements 1,052us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_HoustonIVTXMember
   
Total 2,013cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_HoustonIVTXMember
   
Accumulated Depreciation 245cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_HoustonIVTXMember
   
Houston V, TX      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 125,135us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_HoustonVTXMember
   
Initial cost      
Land 1,153us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_HoustonVTXMember
   
Building and Improvements 6,122us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_HoustonVTXMember
   
Costs Subsequent to Acquisition 712cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_HoustonVTXMember
   
Gross Carrying Amount at year end      
Land 1,156us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_HoustonVTXMember
   
Building and Improvements 5,972us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_HoustonVTXMember
   
Total 7,128cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_HoustonVTXMember
   
Accumulated Depreciation 1,327cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_HoustonVTXMember
   
Houston VI, TX      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 54,680us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_HoustonVITXMember
   
Initial cost      
Land 575us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_HoustonVITXMember
   
Building and Improvements 524us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_HoustonVITXMember
   
Costs Subsequent to Acquisition 5,709cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_HoustonVITXMember
   
Gross Carrying Amount at year end      
Land 983us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_HoustonVITXMember
   
Building and Improvements 4,912us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_HoustonVITXMember
   
Total 5,895cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_HoustonVITXMember
   
Accumulated Depreciation 443cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_HoustonVITXMember
   
Houston VII, TX      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 47,102us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_HoustonVIITXMember
   
Initial cost      
Land 681us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_HoustonVIITXMember
   
Building and Improvements 3,355us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_HoustonVIITXMember
   
Costs Subsequent to Acquisition 83cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_HoustonVIITXMember
   
Gross Carrying Amount at year end      
Land 681us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_HoustonVIITXMember
   
Building and Improvements 3,438us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_HoustonVIITXMember
   
Total 4,119cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_HoustonVIITXMember
   
Accumulated Depreciation 238cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_HoustonVIITXMember
   
Houston VIII, TX      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 54,241us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_HoustonVIIITXMember
   
Initial cost      
Land 1,294us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_HoustonVIIITXMember
   
Building and Improvements 6,377us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_HoustonVIIITXMember
   
Costs Subsequent to Acquisition 136cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_HoustonVIIITXMember
   
Gross Carrying Amount at year end      
Land 1,294us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_HoustonVIIITXMember
   
Building and Improvements 6,514us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_HoustonVIIITXMember
   
Total 7,808cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_HoustonVIIITXMember
   
Accumulated Depreciation 343cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_HoustonVIIITXMember
   
Houston IX, TX      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 51,218us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_HoustonIXTXMember
   
Initial cost      
Land 296us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_HoustonIXTXMember
   
Building and Improvements 1,459us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_HoustonIXTXMember
   
Costs Subsequent to Acquisition 62cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_HoustonIXTXMember
   
Gross Carrying Amount at year end      
Land 296us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_HoustonIXTXMember
   
Building and Improvements 1,521us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_HoustonIXTXMember
   
Total 1,817cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_HoustonIXTXMember
   
Accumulated Depreciation 80cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_HoustonIXTXMember
   
Katy, TX      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 71,308us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_KatyTXMember
   
Initial cost      
Land 1,329us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_KatyTXMember
   
Building and Improvements 6,552us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_KatyTXMember
   
Costs Subsequent to Acquisition 9cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_KatyTXMember
   
Gross Carrying Amount at year end      
Land 1,329us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_KatyTXMember
   
Building and Improvements 6,561us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_KatyTXMember
   
Total 7,890cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_KatyTXMember
   
Accumulated Depreciation 957cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_KatyTXMember
   
Keller, TX      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 61,885us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_KellerTXMember
   
Initial cost      
Land 890us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_KellerTXMember
   
Building and Improvements 4,727us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_KellerTXMember
   
Costs Subsequent to Acquisition 140cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_KellerTXMember
   
Gross Carrying Amount at year end      
Land 890us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_KellerTXMember
   
Building and Improvements 4,282us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_KellerTXMember
   
Total 5,172cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_KellerTXMember
   
Accumulated Depreciation 1,057cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_KellerTXMember
   
Lewisville I, TX      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 58,140us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LewisvilleITXMember
   
Initial cost      
Land 476us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LewisvilleITXMember
   
Building and Improvements 2,525us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LewisvilleITXMember
   
Costs Subsequent to Acquisition 295cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LewisvilleITXMember
   
Gross Carrying Amount at year end      
Land 492us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LewisvilleITXMember
   
Building and Improvements 2,406us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LewisvilleITXMember
   
Total 2,898cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LewisvilleITXMember
   
Accumulated Depreciation 566cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LewisvilleITXMember
   
Lewisville II, TX      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 127,609us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LewisvilleIITXMember
   
Initial cost      
Land 1,464us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LewisvilleIITXMember
   
Building and Improvements 7,217us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LewisvilleIITXMember
   
Costs Subsequent to Acquisition 135cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LewisvilleIITXMember
   
Gross Carrying Amount at year end      
Land 1,464us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LewisvilleIITXMember
   
Building and Improvements 7,353us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LewisvilleIITXMember
   
Total 8,817cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LewisvilleIITXMember
   
Accumulated Depreciation 601cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LewisvilleIITXMember
   
Mansfield I, TX      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 63,025us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MansfieldITXMember
   
Initial cost      
Land 837us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MansfieldITXMember
   
Building and Improvements 4,443us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MansfieldITXMember
   
Costs Subsequent to Acquisition 197cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MansfieldITXMember
   
Gross Carrying Amount at year end      
Land 843us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MansfieldITXMember
   
Building and Improvements 4,062us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MansfieldITXMember
   
Total 4,905cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MansfieldITXMember
   
Accumulated Depreciation 983cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MansfieldITXMember
   
Mansfield II, TX      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 57,775us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MansfieldIITXMember
   
Initial cost      
Land 662us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MansfieldIITXMember
   
Building and Improvements 3,261us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MansfieldIITXMember
   
Costs Subsequent to Acquisition 63cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MansfieldIITXMember
   
Gross Carrying Amount at year end      
Land 662us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MansfieldIITXMember
   
Building and Improvements 3,323us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MansfieldIITXMember
   
Total 3,985cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MansfieldIITXMember
   
Accumulated Depreciation 193cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MansfieldIITXMember
   
McKinney I, TX      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 47,020us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_McKinneyITXMember
   
Initial cost      
Land 1,632us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_McKinneyITXMember
   
Building and Improvements 1,486us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_McKinneyITXMember
   
Costs Subsequent to Acquisition 134cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_McKinneyITXMember
   
Gross Carrying Amount at year end      
Land 1,634us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_McKinneyITXMember
   
Building and Improvements 1,381us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_McKinneyITXMember
   
Total 3,015cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_McKinneyITXMember
   
Accumulated Depreciation 364cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_McKinneyITXMember
   
McKinney II, TX      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 70,050us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_McKinneyIITXMember
   
Initial cost      
Land 855us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_McKinneyIITXMember
   
Building and Improvements 5,076us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_McKinneyIITXMember
   
Costs Subsequent to Acquisition 161cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_McKinneyIITXMember
   
Gross Carrying Amount at year end      
Land 857us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_McKinneyIITXMember
   
Building and Improvements 4,612us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_McKinneyIITXMember
   
Total 5,469cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_McKinneyIITXMember
   
Accumulated Depreciation 1,131cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_McKinneyIITXMember
   
McKinney III, TX      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 67,468us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MckinneyIIITXMember
   
Initial cost      
Land 652us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MckinneyIIITXMember
   
Building and Improvements 3,213us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MckinneyIIITXMember
   
Costs Subsequent to Acquisition 1cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MckinneyIIITXMember
   
Gross Carrying Amount at year end      
Land 652us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MckinneyIIITXMember
   
Building and Improvements 3,214us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MckinneyIIITXMember
   
Total 3,866cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MckinneyIIITXMember
   
North Richland Hills, TX      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 57,200us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NorthRichlandHillsTXMember
   
Initial cost      
Land 2,252us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NorthRichlandHillsTXMember
   
Building and Improvements 2,049us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NorthRichlandHillsTXMember
   
Costs Subsequent to Acquisition 126cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NorthRichlandHillsTXMember
   
Gross Carrying Amount at year end      
Land 2,252us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NorthRichlandHillsTXMember
   
Building and Improvements 1,798us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NorthRichlandHillsTXMember
   
Total 4,050cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NorthRichlandHillsTXMember
   
Accumulated Depreciation 490cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_NorthRichlandHillsTXMember
   
Pearland, TX      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 72,050us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PearlandTXMember
   
Initial cost      
Land 450us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PearlandTXMember
   
Building and Improvements 2,216us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PearlandTXMember
   
Costs Subsequent to Acquisition 82cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PearlandTXMember
   
Gross Carrying Amount at year end      
Land 450us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PearlandTXMember
   
Building and Improvements 2,299us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PearlandTXMember
   
Total 2,749cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PearlandTXMember
   
Accumulated Depreciation 121cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_PearlandTXMember
   
Richmond, TX      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 102,278us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_RichmondTXMember
   
Initial cost      
Land 1,437us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_RichmondTXMember
   
Building and Improvements 7,083us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_RichmondTXMember
   
Costs Subsequent to Acquisition 66cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_RichmondTXMember
   
Gross Carrying Amount at year end      
Land 1,437us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_RichmondTXMember
   
Building and Improvements 7,149us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_RichmondTXMember
   
Total 8,586cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_RichmondTXMember
   
Accumulated Depreciation 322cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_RichmondTXMember
   
Roanoke, TX      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 59,660us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_RoanokeTXMember
   
Initial cost      
Land 1,337us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_RoanokeTXMember
   
Building and Improvements 1,217us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_RoanokeTXMember
   
Costs Subsequent to Acquisition 127cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_RoanokeTXMember
   
Gross Carrying Amount at year end      
Land 1,337us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_RoanokeTXMember
   
Building and Improvements 1,145us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_RoanokeTXMember
   
Total 2,482cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_RoanokeTXMember
   
Accumulated Depreciation 295cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_RoanokeTXMember
   
San Antonio I, TX      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 73,309us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SanAntonioITXMember
   
Initial cost      
Land 2,895us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SanAntonioITXMember
   
Building and Improvements 2,635us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SanAntonioITXMember
   
Costs Subsequent to Acquisition 306cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SanAntonioITXMember
   
Gross Carrying Amount at year end      
Land 2,895us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SanAntonioITXMember
   
Building and Improvements 2,410us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SanAntonioITXMember
   
Total 5,305cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SanAntonioITXMember
   
Accumulated Depreciation 612cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SanAntonioITXMember
   
San Antonio II, TX      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 73,230us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SanAntonioIITXMember
   
Initial cost      
Land 1,047us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SanAntonioIITXMember
   
Building and Improvements 5,558us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SanAntonioIITXMember
   
Costs Subsequent to Acquisition 148cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SanAntonioIITXMember
   
Gross Carrying Amount at year end      
Land 1,052us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SanAntonioIITXMember
   
Building and Improvements 5,013us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SanAntonioIITXMember
   
Total 6,065cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SanAntonioIITXMember
   
Accumulated Depreciation 1,134cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SanAntonioIITXMember
   
San Antonio III, TX      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 71,775us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SanAntonioIIITXMember
   
Initial cost      
Land 996us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SanAntonioIIITXMember
   
Building and Improvements 5,286us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SanAntonioIIITXMember
   
Costs Subsequent to Acquisition 235cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SanAntonioIIITXMember
   
Gross Carrying Amount at year end      
Land 996us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SanAntonioIIITXMember
   
Building and Improvements 4,799us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SanAntonioIIITXMember
   
Total 5,795cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SanAntonioIIITXMember
   
Accumulated Depreciation 1,052cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SanAntonioIIITXMember
   
Spring, TX      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 72,751us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SpringTXMember
   
Initial cost      
Land 580us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SpringTXMember
   
Building and Improvements 3,081us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SpringTXMember
   
Costs Subsequent to Acquisition 205cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SpringTXMember
   
Gross Carrying Amount at year end      
Land 580us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SpringTXMember
   
Building and Improvements 2,839us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SpringTXMember
   
Total 3,419cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SpringTXMember
   
Accumulated Depreciation 690cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SpringTXMember
   
Murray I, UT      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 60,280us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MurrayIUTMember
   
Initial cost      
Land 3,847us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MurrayIUTMember
   
Building and Improvements 1,017us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MurrayIUTMember
   
Costs Subsequent to Acquisition 458cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MurrayIUTMember
   
Gross Carrying Amount at year end      
Land 3,848us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MurrayIUTMember
   
Building and Improvements 1,261us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MurrayIUTMember
   
Total 5,109cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MurrayIUTMember
   
Accumulated Depreciation 337cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MurrayIUTMember
   
Murray II, UT      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 71,221us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MurrayIIUTMember
   
Initial cost      
Land 2,147us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MurrayIIUTMember
   
Building and Improvements 567us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MurrayIIUTMember
   
Costs Subsequent to Acquisition 460cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MurrayIIUTMember
   
Gross Carrying Amount at year end      
Land 2,148us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MurrayIIUTMember
   
Building and Improvements 865us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MurrayIIUTMember
   
Total 3,013cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MurrayIIUTMember
   
Accumulated Depreciation 262cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_MurrayIIUTMember
   
Salt Lake City I, UT      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 56,446us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SaltLakeCityIUTMember
   
Initial cost      
Land 2,695us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SaltLakeCityIUTMember
   
Building and Improvements 712us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SaltLakeCityIUTMember
   
Costs Subsequent to Acquisition 477cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SaltLakeCityIUTMember
   
Gross Carrying Amount at year end      
Land 2,696us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SaltLakeCityIUTMember
   
Building and Improvements 1,012us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SaltLakeCityIUTMember
   
Total 3,708cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SaltLakeCityIUTMember
   
Accumulated Depreciation 251cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SaltLakeCityIUTMember
   
Salt Lake City II, UT      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 51,676us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SaltLakeCityIIUTMember
   
Initial cost      
Land 2,074us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SaltLakeCityIIUTMember
   
Building and Improvements 548us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SaltLakeCityIIUTMember
   
Costs Subsequent to Acquisition 364cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SaltLakeCityIIUTMember
   
Gross Carrying Amount at year end      
Land 1,931us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SaltLakeCityIIUTMember
   
Building and Improvements 747us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SaltLakeCityIIUTMember
   
Total 2,678cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SaltLakeCityIIUTMember
   
Accumulated Depreciation 203cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_SaltLakeCityIIUTMember
   
Alexandria, VA      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 114,150us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AlexandriaVAMember
   
Encumbrances 9,221us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AlexandriaVAMember
   
Initial cost      
Land 2,812us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AlexandriaVAMember
   
Building and Improvements 13,865us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AlexandriaVAMember
   
Costs Subsequent to Acquisition 177cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AlexandriaVAMember
   
Gross Carrying Amount at year end      
Land 2,812us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AlexandriaVAMember
   
Building and Improvements 14,043us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AlexandriaVAMember
   
Total 16,855cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AlexandriaVAMember
   
Accumulated Depreciation 745cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_AlexandriaVAMember
   
Burke Lake, VA      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 91,667us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BurkeLakeVAMember
   
Encumbrances 7,105us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BurkeLakeVAMember
   
Initial cost      
Land 2,093us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BurkeLakeVAMember
   
Building and Improvements 10,940us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BurkeLakeVAMember
   
Costs Subsequent to Acquisition 1,094cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BurkeLakeVAMember
   
Gross Carrying Amount at year end      
Land 2,093us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BurkeLakeVAMember
   
Building and Improvements 10,438us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BurkeLakeVAMember
   
Total 12,531cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BurkeLakeVAMember
   
Accumulated Depreciation 1,045cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_BurkeLakeVAMember
   
Fairfax, VA      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 73,325us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FairfaxVAMember
   
Initial cost      
Land 2,276us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FairfaxVAMember
   
Building and Improvements 11,220us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FairfaxVAMember
   
Costs Subsequent to Acquisition 182cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FairfaxVAMember
   
Gross Carrying Amount at year end      
Land 2,276us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FairfaxVAMember
   
Building and Improvements 11,402us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FairfaxVAMember
   
Total 13,678cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FairfaxVAMember
   
Accumulated Depreciation 541cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FairfaxVAMember
   
Fredericksburg I, VA      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 69,475us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FredericksburgIVAMember
   
Initial cost      
Land 1,680us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FredericksburgIVAMember
   
Building and Improvements 4,840us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FredericksburgIVAMember
   
Costs Subsequent to Acquisition 280cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FredericksburgIVAMember
   
Gross Carrying Amount at year end      
Land 1,680us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FredericksburgIVAMember
   
Building and Improvements 4,447us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FredericksburgIVAMember
   
Total 6,127cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FredericksburgIVAMember
   
Accumulated Depreciation 1,086cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FredericksburgIVAMember
   
Fredericksburg II, VA      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 61,057us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FredericksburgIIVAMember
   
Initial cost      
Land 1,757us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FredericksburgIIVAMember
   
Building and Improvements 5,062us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FredericksburgIIVAMember
   
Costs Subsequent to Acquisition 320cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FredericksburgIIVAMember
   
Gross Carrying Amount at year end      
Land 1,758us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FredericksburgIIVAMember
   
Building and Improvements 4,690us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FredericksburgIIVAMember
   
Total 6,448cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FredericksburgIIVAMember
   
Accumulated Depreciation 1,159cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_FredericksburgIIVAMember
   
Leesburg, VA      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 85,503us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LeesburgVAMember
   
Initial cost      
Land 1,746us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LeesburgVAMember
   
Building and Improvements 9,894us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LeesburgVAMember
   
Costs Subsequent to Acquisition 79cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LeesburgVAMember
   
Gross Carrying Amount at year end      
Land 1,746us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LeesburgVAMember
   
Building and Improvements 8,685us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LeesburgVAMember
   
Total 10,431cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LeesburgVAMember
   
Accumulated Depreciation 644cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_LeesburgVAMember
   
Manassas, VA      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 72,745us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ManassasVAMember
   
Initial cost      
Land 860us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ManassasVAMember
   
Building and Improvements 4,872us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ManassasVAMember
   
Costs Subsequent to Acquisition 118cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ManassasVAMember
   
Gross Carrying Amount at year end      
Land 860us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ManassasVAMember
   
Building and Improvements 4,327us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ManassasVAMember
   
Total 5,187cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ManassasVAMember
   
Accumulated Depreciation 467cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ManassasVAMember
   
McLearen, VA      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 68,960us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_McLearenVAMember
   
Initial cost      
Land 1,482us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_McLearenVAMember
   
Building and Improvements 8,400us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_McLearenVAMember
   
Costs Subsequent to Acquisition 152cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_McLearenVAMember
   
Gross Carrying Amount at year end      
Land 1,482us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_McLearenVAMember
   
Building and Improvements 7,397us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_McLearenVAMember
   
Total 8,879cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_McLearenVAMember
   
Accumulated Depreciation 764cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_McLearenVAMember
   
Vienna, VA      
REAL ESTATE AND RELATED DEPRECIATION      
Area of facility (in square feet) 54,698us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ViennaVAMember
   
Initial cost      
Land 2,300us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ViennaVAMember
   
Building and Improvements 11,340us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ViennaVAMember
   
Costs Subsequent to Acquisition 115cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ViennaVAMember
   
Gross Carrying Amount at year end      
Land 2,300us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ViennaVAMember
   
Building and Improvements 11,456us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ViennaVAMember
   
Total 13,756cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ViennaVAMember
   
Accumulated Depreciation 549cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_ViennaVAMember
   
Divisional Offices      
Initial cost      
Costs Subsequent to Acquisition 168cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DivisionalOfficesMember
   
Gross Carrying Amount at year end      
Building and Improvements 168us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DivisionalOfficesMember
   
Total 168cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DivisionalOfficesMember
   
Accumulated Depreciation 29cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_DivisionalOfficesMember
   
USIFB      
Initial cost      
Costs Subsequent to Acquisition 5,702cube_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisition
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_USIFBMember
   
Gross Carrying Amount at year end      
Building and Improvements 5,702us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_USIFBMember
   
Total 5,702cube_RealEstateAndAccumulatedDepreciationCarryingAmount
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_USIFBMember
   
Accumulated Depreciation $ 1,247cube_RealEstateAndAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= cube_USIFBMember