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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 5) (Revenues, Location of facilities)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
New York
      
Concentration of Credit Risk      
Percentage of total revenues (as a percent) 17.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= cube_RealEstateRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember
/ cube_RealEstateByLocationAxis
= stpr_NY		 17.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= cube_RealEstateRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember
/ cube_RealEstateByLocationAxis
= stpr_NY		 16.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= cube_RealEstateRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember
/ cube_RealEstateByLocationAxis
= stpr_NY
Florida
      
Concentration of Credit Risk      
Percentage of total revenues (as a percent) 17.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= cube_RealEstateRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember
/ cube_RealEstateByLocationAxis
= stpr_FL		 15.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= cube_RealEstateRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember
/ cube_RealEstateByLocationAxis
= stpr_FL		 15.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= cube_RealEstateRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember
/ cube_RealEstateByLocationAxis
= stpr_FL
California
      
Concentration of Credit Risk      
Percentage of total revenues (as a percent) 8.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= cube_RealEstateRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember
/ cube_RealEstateByLocationAxis
= stpr_CA		 9.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= cube_RealEstateRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember
/ cube_RealEstateByLocationAxis
= stpr_CA		 10.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= cube_RealEstateRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember
/ cube_RealEstateByLocationAxis
= stpr_CA
Texas
      
Concentration of Credit Risk      
Percentage of total revenues (as a percent) 10.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= cube_RealEstateRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember
/ cube_RealEstateByLocationAxis
= stpr_TX		 10.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= cube_RealEstateRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember
/ cube_RealEstateByLocationAxis
= stpr_TX		 10.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= cube_RealEstateRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember
/ cube_RealEstateByLocationAxis
= stpr_TX