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FAIR VALUE MEASUREMENTS (Details) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2014
item
Dec. 31, 2013
Fair value of financial assets and liabilities carried at fair value      
Gain from remeasurement of investment in real estate venture $ 7,023,000us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain    
Aggregate carrying value of total debt   1,200,000,000us-gaap_DebtAndCapitalLeaseObligations 1,100,000,000us-gaap_DebtAndCapitalLeaseObligations
Estimated fair value of total debt   1,200,000,000us-gaap_DebtInstrumentFairValue 1,100,000,000us-gaap_DebtInstrumentFairValue
Interest rate swap      
Fair value of financial assets and liabilities carried at fair value      
Number of counterparties to derivative contracts who experienced significant downgrades in 2014   0cube_NumberOfCounterpartiesExperiencedSignificantDowngradesInCurrentFiscalYear
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
 
Level 2      
Fair value of financial assets and liabilities carried at fair value      
Total liabilities at fair value   8,299,000us-gaap_LiabilitiesFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
10,763,000us-gaap_LiabilitiesFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
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Level 2 | Interest rate swap      
Fair value of financial assets and liabilities carried at fair value      
Derivative Liabilities   8,299,000us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
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10,763,000us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
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Level 3 | Nonrecurring basis      
Fair value of financial assets and liabilities carried at fair value      
Gain from remeasurement of investment in real estate venture $ 7,000,000us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
   
Level 3 | Nonrecurring basis | Minimum      
Fair value of financial assets and liabilities carried at fair value      
Yield rates for determining the fair value of HSREV (as a percent) 6.00%cube_FairValueInputsYieldRate
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
   
Level 3 | Nonrecurring basis | Maximum      
Fair value of financial assets and liabilities carried at fair value      
Yield rates for determining the fair value of HSREV (as a percent) 7.00%cube_FairValueInputsYieldRate
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember