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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 4) (USD $) | 12 Months Ended
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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 |

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