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RISK MANAGEMENT AND USE OF FINANCIAL INSTRUMENTS (Details) (USD $) | 12 Months Ended |
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Dec. 31, 2014 | Dec. 31, 2013
Derivative financial instruments |  |
Unrealized losses reclassified from accumulated other comprehensive loss | $ 6,300,000us-gaap_DerivativeInstrumentsLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortion |
Amount estimated to be reclassified as an increase to interest expense | 5,700,000us-gaap_DerivativeInstrumentsGainLossReclassificationFromAccumulatedOCIToIncomeEstimatedNetAmountToBeTransferred |
Designated | Cash flow |  |
Derivative financial instruments |  |
Notional Amount | 400,000,000invest_DerivativeNotionalAmount / cube_DerivativeInstrumentByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember |
Fair Value | (8,299,000)us-gaap_DerivativeFairValueOfDerivativeLiability / cube_DerivativeInstrumentByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember | (10,763,000)us-gaap_DerivativeFairValueOfDerivativeLiability / cube_DerivativeInstrumentByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember
Maximum number of days outstanding to have the option to borrow at the LIBOR | 30 days |
Designated | Cash flow | Hedge Product, Swap one |  |
Derivative financial instruments |  |
Notional Amount | 40,000,000invest_DerivativeNotionalAmount / cube_DerivativeInstrumentByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_DerivativeInstrumentRiskAxis = cube_InterestRateSwapOneMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember |
Swap, Strike rate (as a percent) | 1.8025%us-gaap_DerivativeFixedInterestRate / cube_DerivativeInstrumentByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_DerivativeInstrumentRiskAxis = cube_InterestRateSwapOneMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember |
Fair Value | (757,000)us-gaap_DerivativeFairValueOfDerivativeLiability / cube_DerivativeInstrumentByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_DerivativeInstrumentRiskAxis = cube_InterestRateSwapOneMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember | (1,265,000)us-gaap_DerivativeFairValueOfDerivativeLiability / cube_DerivativeInstrumentByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_DerivativeInstrumentRiskAxis = cube_InterestRateSwapOneMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember
Designated | Cash flow | Hedge Product, Swap two |  |
Derivative financial instruments |  |
Notional Amount | 40,000,000invest_DerivativeNotionalAmount / cube_DerivativeInstrumentByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_DerivativeInstrumentRiskAxis = cube_InterestRateSwapTwoMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember |
Swap, Strike rate (as a percent) | 1.8025%us-gaap_DerivativeFixedInterestRate / cube_DerivativeInstrumentByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_DerivativeInstrumentRiskAxis = cube_InterestRateSwapTwoMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember |
Fair Value | (757,000)us-gaap_DerivativeFairValueOfDerivativeLiability / cube_DerivativeInstrumentByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_DerivativeInstrumentRiskAxis = cube_InterestRateSwapTwoMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember | (1,265,000)us-gaap_DerivativeFairValueOfDerivativeLiability / cube_DerivativeInstrumentByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_DerivativeInstrumentRiskAxis = cube_InterestRateSwapTwoMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember
Designated | Cash flow | Hedge Product, Swap three |  |
Derivative financial instruments |  |
Notional Amount | 20,000,000invest_DerivativeNotionalAmount / cube_DerivativeInstrumentByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_DerivativeInstrumentRiskAxis = cube_InterestRateSwapThreeMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember |
Swap, Strike rate (as a percent) | 1.8025%us-gaap_DerivativeFixedInterestRate / cube_DerivativeInstrumentByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_DerivativeInstrumentRiskAxis = cube_InterestRateSwapThreeMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember |
Fair Value | (378,000)us-gaap_DerivativeFairValueOfDerivativeLiability / cube_DerivativeInstrumentByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_DerivativeInstrumentRiskAxis = cube_InterestRateSwapThreeMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember | (632,000)us-gaap_DerivativeFairValueOfDerivativeLiability / cube_DerivativeInstrumentByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_DerivativeInstrumentRiskAxis = cube_InterestRateSwapThreeMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember
Designated | Cash flow | Hedge Product, Swap four |  |
Derivative financial instruments |  |
Notional Amount | 75,000,000invest_DerivativeNotionalAmount / cube_DerivativeInstrumentByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_DerivativeInstrumentRiskAxis = cube_InterestRateSwapFourMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember |
Swap, Strike rate (as a percent) | 1.336%us-gaap_DerivativeFixedInterestRate / cube_DerivativeInstrumentByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_DerivativeInstrumentRiskAxis = cube_InterestRateSwapFourMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember |
Fair Value | (841,000)us-gaap_DerivativeFairValueOfDerivativeLiability / cube_DerivativeInstrumentByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_DerivativeInstrumentRiskAxis = cube_InterestRateSwapFourMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember | (1,132,000)us-gaap_DerivativeFairValueOfDerivativeLiability / cube_DerivativeInstrumentByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_DerivativeInstrumentRiskAxis = cube_InterestRateSwapFourMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember
Designated | Cash flow | Hedge Product, Swap five |  |
Derivative financial instruments |  |
Notional Amount | 50,000,000invest_DerivativeNotionalAmount / cube_DerivativeInstrumentByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_DerivativeInstrumentRiskAxis = cube_InterestRateSwapFiveMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember |
Swap, Strike rate (as a percent) | 1.336%us-gaap_DerivativeFixedInterestRate / cube_DerivativeInstrumentByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_DerivativeInstrumentRiskAxis = cube_InterestRateSwapFiveMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember |
Fair Value | (561,000)us-gaap_DerivativeFairValueOfDerivativeLiability / cube_DerivativeInstrumentByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_DerivativeInstrumentRiskAxis = cube_InterestRateSwapFiveMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember | (752,000)us-gaap_DerivativeFairValueOfDerivativeLiability / cube_DerivativeInstrumentByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_DerivativeInstrumentRiskAxis = cube_InterestRateSwapFiveMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember
Designated | Cash flow | Hedge Product, Swap six |  |
Derivative financial instruments |  |
Notional Amount | 50,000,000invest_DerivativeNotionalAmount / cube_DerivativeInstrumentByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_DerivativeInstrumentRiskAxis = cube_InterestRateSwapSixMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember |
Swap, Strike rate (as a percent) | 1.336%us-gaap_DerivativeFixedInterestRate / cube_DerivativeInstrumentByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_DerivativeInstrumentRiskAxis = cube_InterestRateSwapSixMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember |
Fair Value | (561,000)us-gaap_DerivativeFairValueOfDerivativeLiability / cube_DerivativeInstrumentByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_DerivativeInstrumentRiskAxis = cube_InterestRateSwapSixMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember | (754,000)us-gaap_DerivativeFairValueOfDerivativeLiability / cube_DerivativeInstrumentByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_DerivativeInstrumentRiskAxis = cube_InterestRateSwapSixMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember
Designated | Cash flow | Hedge Product, Swap seven |  |
Derivative financial instruments |  |
Notional Amount | 25,000,000invest_DerivativeNotionalAmount / cube_DerivativeInstrumentByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_DerivativeInstrumentRiskAxis = cube_InterestRateSwapSevenMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember |
Swap, Strike rate (as a percent) | 1.3375%us-gaap_DerivativeFixedInterestRate / cube_DerivativeInstrumentByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_DerivativeInstrumentRiskAxis = cube_InterestRateSwapSevenMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember |
Fair Value | (281,000)us-gaap_DerivativeFairValueOfDerivativeLiability / cube_DerivativeInstrumentByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_DerivativeInstrumentRiskAxis = cube_InterestRateSwapSevenMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember | (380,000)us-gaap_DerivativeFairValueOfDerivativeLiability / cube_DerivativeInstrumentByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_DerivativeInstrumentRiskAxis = cube_InterestRateSwapSevenMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember
Designated | Cash flow | Hedge Product, Swap eight |  |
Derivative financial instruments |  |
Notional Amount | 40,000,000invest_DerivativeNotionalAmount / cube_DerivativeInstrumentByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_DerivativeInstrumentRiskAxis = cube_InterestRateSwapEightMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember |
Swap, Strike rate (as a percent) | 2.459%us-gaap_DerivativeFixedInterestRate / cube_DerivativeInstrumentByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_DerivativeInstrumentRiskAxis = cube_InterestRateSwapEightMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember |
Fair Value | (1,654,000)us-gaap_DerivativeFairValueOfDerivativeLiability / cube_DerivativeInstrumentByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_DerivativeInstrumentRiskAxis = cube_InterestRateSwapEightMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember | (1,820,000)us-gaap_DerivativeFairValueOfDerivativeLiability / cube_DerivativeInstrumentByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_DerivativeInstrumentRiskAxis = cube_InterestRateSwapEightMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember
Designated | Cash flow | Hedge Product, Swap nine |  |
Derivative financial instruments |  |
Notional Amount | 40,000,000invest_DerivativeNotionalAmount / cube_DerivativeInstrumentByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_DerivativeInstrumentRiskAxis = cube_InterestRateSwapNineMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember |
Swap, Strike rate (as a percent) | 2.4725%us-gaap_DerivativeFixedInterestRate / cube_DerivativeInstrumentByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_DerivativeInstrumentRiskAxis = cube_InterestRateSwapNineMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember |
Fair Value | (1,672,000)us-gaap_DerivativeFairValueOfDerivativeLiability / cube_DerivativeInstrumentByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_DerivativeInstrumentRiskAxis = cube_InterestRateSwapNineMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember | (1,842,000)us-gaap_DerivativeFairValueOfDerivativeLiability / cube_DerivativeInstrumentByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_DerivativeInstrumentRiskAxis = cube_InterestRateSwapNineMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember
Designated | Cash flow | Hedge Product, Swap ten |  |
Derivative financial instruments |  |
Notional Amount | 20,000,000invest_DerivativeNotionalAmount / cube_DerivativeInstrumentByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_DerivativeInstrumentRiskAxis = cube_InterestRateSwapTenMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember |
Swap, Strike rate (as a percent) | 2.475%us-gaap_DerivativeFixedInterestRate / cube_DerivativeInstrumentByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_DerivativeInstrumentRiskAxis = cube_InterestRateSwapTenMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember |
Fair Value | $ (837,000)us-gaap_DerivativeFairValueOfDerivativeLiability / cube_DerivativeInstrumentByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_DerivativeInstrumentRiskAxis = cube_InterestRateSwapTenMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember | $ (921,000)us-gaap_DerivativeFairValueOfDerivativeLiability / cube_DerivativeInstrumentByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_DerivativeInstrumentRiskAxis = cube_InterestRateSwapTenMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember

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- Definition Represents the maximum number of days that borrowings may be outstanding in order for the entity to have the option to borrow at the prime rate of interest. + References No definition available. + Details
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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Fair value before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226000-175313 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=20225523&loc=SL20225862-175312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624163-113959 + Details
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- Definition Fixed interest rate related to the interest rate derivative. + References No definition available. + Details
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- Definition The estimated value of gains (losses), net anticipated to be transferred in the future from accumulated other comprehensive income into earnings. + References No definition available. + Details
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- Definition The effective portion of loss reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 + Details
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