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RISK MANAGEMENT AND USE OF FINANCIAL INSTRUMENTS (Details) (USD $)	12 Months Ended
	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

X

- 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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X

- 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

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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

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X

- Definition

Fixed interest rate related to the interest rate derivative.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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X

- 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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X

- 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

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