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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 4) (USD $)
 12 Months Ended
Dec. 31, 2014
property
Dec. 31, 2013
Dec. 31, 2012
Income Taxes      
Net tax basis in the entity's assets $ 2,600,000,000us-gaap_RealEstateFederalIncomeTaxBasis $ 2,200,000,000us-gaap_RealEstateFederalIncomeTaxBasis  
Percentage of distributions characterized as ordinary income dividends 94.143%cube_OrdinaryIncomeDistributionsPaidPercentage    
Percentage of distributions characterized as capital gain dividends 5.857%cube_CapitalGainDistributionsPaidPercentage    
Series A Cumulative Redeemable Preferred shares, percentage 7.75%us-gaap_PreferredStockDividendRatePercentage 7.75%us-gaap_PreferredStockDividendRatePercentage  
Percentage of distributions characterized as ordinary income distributions to preferred shareholders 92.837%cube_PreferredStockOrdinaryIncomeDistributionsPaidPercentage    
Percentage of distributions characterized as capital gain distribution to preferred shareholders 7.163%cube_PreferredStockCapitalGainDistributionsPaidPercentage    
Federal excise tax rate (as a percent) 4.00%cube_FederalExciseTaxRate    
Percentage of ordinary income considered for the calculation of annual amount which is subject to federal excise tax 85.00%cube_PercentageOfOrdinaryIncomeConsideredForCalculationOfExciseTax    
Percentage of net capital gain considered for the calculation of annual amount which is subject to Federal excise tax 95.00%cube_PercentageOfCapitalGainConsideredForCalculationOfExciseTax    
Percentage of prior year taxable income considered for the calculation of annual amount which is subject to federal excise tax 100.00%cube_PercentageOfPriorYearTaxableIncomeConsideredForCalculationOfExciseTax    
Net deferred tax asset recorded by REIT subsidiary TRS 1,000,000us-gaap_DeferredTaxAssetsTaxDeferredExpense 700,000us-gaap_DeferredTaxAssetsTaxDeferredExpense  
Earnings per Share and Unit      
Potential dilutive securities not included in the calculation of diluted earnings per share, as they were identified as anti-dilutive (in shares)     2,000,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Potential dilutive securities included in the calculation of diluted earnings per share (in shares) 1,756,000us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements 2,551,000us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements  
Foreign currency      
Foreign currency exchange rate (U.S. Dollars per pound) 1.558642us-gaap_ForeignCurrencyExchangeRateTranslation1 1.657413us-gaap_ForeignCurrencyExchangeRateTranslation1  
Foreign currency average exchange rate (U.S. Dollars per pound) 1.643106cube_ForeignCurrencyExchangeRateTranslationAverageRate 1.588598cube_ForeignCurrencyExchangeRateTranslationAverageRate 1.585074cube_ForeignCurrencyExchangeRateTranslationAverageRate
Unrealized gain on foreign currency translation (200,000)us-gaap_ForeignCurrencyTransactionGainLossUnrealized 100,000us-gaap_ForeignCurrencyTransactionGainLossUnrealized 200,000us-gaap_ForeignCurrencyTransactionGainLossUnrealized
Number of Real Estate Properties Sold 1cube_NumberOfRealEstatePropertiesSold    
Interest rate swap | Designated | Cash flow      
Derivative Financial Instruments      
Notional principal amounts $ 400,000,000us-gaap_DerivativeLiabilityNotionalAmount
/ cube_DerivativeInstrumentByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember		 $ 400,000,000us-gaap_DerivativeLiabilityNotionalAmount
/ cube_DerivativeInstrumentByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember