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INVESTMENT IN UNCONSOLIDATED REAL ESTATE VENTURE (Details) (USD $) | 12 Months Ended | 0 Months Ended |
--- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | May 01, 2014 | Dec. 10, 2013 property | Sep. 28, 2012 | Sep. 26, 2011 property | Aug. 25, 2014 property | Nov. 03, 2014
Investment in Unconsolidated Real Estate Venture |  |  |  |  |  |  |  |  |
Payment made for acquisition of interest in real estate ventures |  | $ 157,461,000us-gaap_PaymentsToAcquireEquityMethodInvestments |  |  |  |  |  |  |
Gain from remeasurement of investment in real estate venture |  |  | 7,023,000us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain |  |  |  |  |  |
Summary of results of operations of the real estate venture |  |  |  |  |  |  |  |  |
Company's share of net loss | (6,255,000)us-gaap_IncomeLossFromEquityMethodInvestments | (1,151,000)us-gaap_IncomeLossFromEquityMethodInvestments | (745,000)us-gaap_IncomeLossFromEquityMethodInvestments |  |  |  |  |  |
HHF |  |  |  |  |  |  |  |  |
Investment in Unconsolidated Real Estate Venture |  |  |  |  |  |  |  |  |
Number of storage facilities owned by investee |  |  |  |  | 35cube_NumberOfRealEstatePropertiesAcquired / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cube_HHFVentureMember |  |  |  |
Payment made for acquisition of interest in real estate ventures |  |  |  |  | 315,700,000us-gaap_PaymentsToAcquireEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cube_HHFVentureMember |  |  |  |
Ownership interest in partnership (as a percent) |  |  |  |  | 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cube_HHFVentureMember |  |  |  |
Proceeds after closing costs distributed proportionately to partners |  |  |  | 99,200,000cube_ProceedsDistributedAfterDepositsAndClosingCosts / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cube_HHFVentureMember |  |  |  |  |
Intangible value of the in-place leases |  |  |  |  | 12,100,000cube_RealEstatePropertiesAcquiredIntangibleLeaseAssets / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cube_HHFVentureMember |  |  |  |
Assets |  |  |  |  |  |  |  |  |
Storage facilities, net | 291,357,000cube_EquityMethodInvestmentSummarizedFinancialInformationRealEstateInvestmentPropertyNet / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cube_HHFVentureMember | 302,557,000cube_EquityMethodInvestmentSummarizedFinancialInformationRealEstateInvestmentPropertyNet / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cube_HHFVentureMember |  |  |  |  |  |  |
Other assets | 5,786,000cube_EquityMethodInvestmentSummarizedFinancialInformationOtherAssets / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cube_HHFVentureMember | 11,688,000cube_EquityMethodInvestmentSummarizedFinancialInformationOtherAssets / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cube_HHFVentureMember |  |  |  |  |  |  |
Total Assets | 297,143,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cube_HHFVentureMember | 314,245,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cube_HHFVentureMember |  |  |  |  |  |  |
Liabilities and equity |  |  |  |  |  |  |  |  |
Other liabilities | 5,725,000cube_EquityMethodInvestmentSummarizedFinancialInformationOtherLiabilities / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cube_HHFVentureMember | 1,625,000cube_EquityMethodInvestmentSummarizedFinancialInformationOtherLiabilities / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cube_HHFVentureMember |  |  |  |  |  |  |
Debt | 100,000,000us-gaap_LongTermDebt / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cube_HHFVentureMember |  |  |  |  |  |  |  |
Equity |  |  |  |  |  |  |  |  |
CubeSmart | 95,709,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquityOrCapital / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cube_HHFVentureMember | 156,310,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquityOrCapital / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cube_HHFVentureMember |  |  |  |  |  |  |
Joint venture partner | 95,709,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationMinorityInterest / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cube_HHFVentureMember | 156,310,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationMinorityInterest / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cube_HHFVentureMember |  |  |  |  |  |  |
Total liabilities and equity | 297,143,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationLiabilitiesAndEquity / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cube_HHFVentureMember | 314,245,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationLiabilitiesAndEquity / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cube_HHFVentureMember |  |  |  |  |  |  |
Summary of results of operations of the real estate venture |  |  |  |  |  |  |  |  |
Total revenues | 26,852,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cube_HHFVentureMember | 1,600,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cube_HHFVentureMember |  |  |  |  |  |  |
Operating expenses | 11,754,000cube_EquityMethodInvestmentSummarizedFinancialInformationOperatingExpenses / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cube_HHFVentureMember | 1,742,000cube_EquityMethodInvestmentSummarizedFinancialInformationOperatingExpenses / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cube_HHFVentureMember |  |  |  |  |  |  |
Interest expense, net | 2,522,000cube_EquityMethodInvestmentSummarizedFinancialInformationInterestIncomeExpenseNet / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cube_HHFVentureMember |  |  |  |  |  |  |  |
Depreciation and amortization | 25,086,000cube_EquityMethodInvestmentSummarizedFinancialInformationDepreciationAndAmortization / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cube_HHFVentureMember | 2,160,000cube_EquityMethodInvestmentSummarizedFinancialInformationDepreciationAndAmortization / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cube_HHFVentureMember |  |  |  |  |  |  |
Net loss | (12,510,000)us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cube_HHFVentureMember | (2,302,000)us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cube_HHFVentureMember |  |  |  |  |  |  |
Company's share of net loss | (6,255,000)us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cube_HHFVentureMember | (1,151,000)us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cube_HHFVentureMember |  |  |  |  |  |  |
HHF | Secured loan 3.59% due April 30, 2021 |  |  |  |  |  |  |  |  |
Investment in Unconsolidated Real Estate Venture |  |  |  |  |  |  |  |  |
Amount of loan obtained |  |  |  | 100,000,000us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages / us-gaap_DebtInstrumentAxis = cube_MortgageSecuredDebt3.59PercentDueOnApril302021Member / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cube_HHFVentureMember |  |  |  |  |
Interest on real estate venture debt |  |  |  | 3.59%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = cube_MortgageSecuredDebt3.59PercentDueOnApril302021Member / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cube_HHFVentureMember |  |  |  |  |
HHF | Facilitates located in Texas |  |  |  |  |  |  |  |  |
Investment in Unconsolidated Real Estate Venture |  |  |  |  |  |  |  |  |
Number of storage facilities owned by investee |  |  |  |  | 34cube_NumberOfRealEstatePropertiesAcquired / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cube_HHFVentureMember / cube_ScheduleOfRealEstateInvestmentPropertyAxis = cube_StorageFacilityInTexasMember |  |  |  |
HHF | Facilitates located in North Carolina |  |  |  |  |  |  |  |  |
Investment in Unconsolidated Real Estate Venture |  |  |  |  |  |  |  |  |
Number of storage facilities owned by investee |  |  |  |  | 1cube_NumberOfRealEstatePropertiesAcquired / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cube_HHFVentureMember / cube_ScheduleOfRealEstateInvestmentPropertyAxis = cube_StorageFacilityInNorthCarolinaMember |  |  |  |
HSRE Venture |  |  |  |  |  |  |  |  |
Investment in Unconsolidated Real Estate Venture |  |  |  |  |  |  |  |  |
Number of storage facilities owned by investee |  |  |  |  |  |  | 9cube_NumberOfRealEstatePropertiesAcquired / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cube_HSREVentureMember |  |
Payment made for acquisition of interest in real estate ventures |  |  |  |  |  |  | 15,400,000us-gaap_PaymentsToAcquireEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cube_HSREVentureMember |  |
Ownership interest in partnership (as a percent) |  |  |  |  |  |  | 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cube_HSREVentureMember |  |
Acquisition of remaining interest in real estate ventures (as a percent) |  |  |  |  |  | 50.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cube_HSREVentureMember |  |  |
Cash paid for acquisition of remaining interest in real estate ventures |  |  |  |  |  | 21,700,000us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cube_HSREVentureMember |  |  |
Amount of debt repaid |  |  |  |  |  | 59,300,000us-gaap_RepaymentsOfDebt / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cube_HSREVentureMember |  |  |
Gain from remeasurement of investment in real estate venture |  |  | 7,000,000us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cube_HSREVentureMember |  |  |  |  |  |
Summary of results of operations of the real estate venture |  |  |  |  |  |  |  |  |
Total revenues |  |  | 7,229,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cube_HSREVentureMember |  |  |  |  |  |
Operating expenses |  |  | 3,010,000cube_EquityMethodInvestmentSummarizedFinancialInformationOperatingExpenses / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cube_HSREVentureMember |  |  |  |  |  |
Interest expense, net |  |  | 2,690,000cube_EquityMethodInvestmentSummarizedFinancialInformationInterestIncomeExpenseNet / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cube_HSREVentureMember |  |  |  |  |  |
Depreciation and amortization |  |  | 2,691,000cube_EquityMethodInvestmentSummarizedFinancialInformationDepreciationAndAmortization / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cube_HSREVentureMember |  |  |  |  |  |
Net loss |  |  | (1,162,000)us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cube_HSREVentureMember |  |  |  |  |  |
Company's share of net loss |  |  | (745,000)us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cube_HSREVentureMember |  |  |  |  |  |
HSRE Venture | Other partner |  |  |  |  |  |  |  |  |
Investment in Unconsolidated Real Estate Venture |  |  |  |  |  |  |  |  |
Ownership interest in partnership (as a percent) |  |  |  |  |  |  | 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / dei_LegalEntityAxis = us-gaap_LimitedPartnerMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cube_HSREVentureMember |  |
HSRE |  |  |  |  |  |  |  |  |
Investment in Unconsolidated Real Estate Venture |  |  |  |  |  |  |  |  |
Number of storage facilities owned by investee |  |  |  |  |  |  |  | 26cube_NumberOfRealEstatePropertiesAcquired / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cube_HSREMember |
Intangible value of the in-place leases |  |  |  |  |  |  |  |  | $ 14,500,000cube_RealEstatePropertiesAcquiredIntangibleLeaseAssets / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cube_HSREMember

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