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SHARE-BASED COMPENSATION PLANS (Details) (USD $) In Millions, except Share data, unless otherwise specified | 0 Months Ended | 12 Months Ended | 0 Months Ended
--- | --- | --- | ---
May 30, 2012 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Jan. 24, 2014 | Jan. 25, 2013 | Jan. 25, 2012
Chief executive officer |  |  |  |  |  |  |  |
Share options, additional general disclosures |  |  |  |  |  |  |  |
Aggregate grant date fair value of share based awards issued (in dollars) | $ 3.0cube_ShareBasedCompensationArrangementByShareBasedPaymentAwardShareBasedAwardsGrantsInPeriodAggregateGrantDateFairValue / us-gaap_TitleOfIndividualAxis = us-gaap_ChiefExecutiveOfficerMember |  |  |  |  |  |  |
Number of Non-Vested Restricted Shares |  |  |  |  |  |  |  |
Granted (in shares) | 274,668us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_TitleOfIndividualAxis = us-gaap_ChiefExecutiveOfficerMember |  |  |  |  |  |  |
Restricted share, additional disclosure |  |  |  |  |  |  |  |
Period for calculation of total return to shareholders | 2 years |  |  |  |  |  |  |
Share Options |  |  |  |  |  |  |  |
Assumptions used for estimating the fair value of share options using the Black-Scholes option-pricing model |  |  |  |  |  |  |  |
Risk-free interest rate (as a percent) |  | 1.90%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | 1.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | 2.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |  |
Expected dividend yield (as a percent) |  | 3.20%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | 3.30%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | 4.50%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |  |
Volatility (as a percent) |  | 37.98%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | 42.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | 52.22%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |  |
Weighted average expected life of the options |  | 6 years | 6 years | 9 years 7 months 2 days |  |  |  |
Weighted average grant date fair value of options granted per share (in dollars per share) |  | $ 4.33us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | $ 4.28us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | $ 3.94us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |  |
Share options, additional general disclosures |  |  |  |  |  |  |  |
Compensation expense recognized (in dollars) |  | 0.9us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | 0.9us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | 1.2us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |  |
Aggregate grant date fair value of share based awards issued (in dollars) |  | 1.0cube_ShareBasedCompensationArrangementByShareBasedPaymentAwardShareBasedAwardsGrantsInPeriodAggregateGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |  |  |  |
Unrecognized compensation cost |  | 1.0us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |  |  |  |
Unrecognized compensation cost recorded, period |  | 3 years |  |  |  |  |  |
Number of Shares Under Option |  |  |  |  |  |  |  |
Balance at the beginning of the period (in shares) |  | 4,904,613us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | 5,257,864us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | 5,255,718us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |  |
Options granted (in shares) |  | 223,590us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | 182,297us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | 222,421us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |  |
Options canceled (in shares) |  | (10,731)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | (24,000)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | (10,375)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |  |
Options exercised (in shares) |  | (1,425,171)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | (511,548)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | (209,900)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |  |
Balance at the end of the period (in shares) |  | 3,692,301us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | 4,904,613us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | 5,257,864us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | 5,255,718us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |
Vested or expected to vest at the end of the period (in shares) |  | 3,692,301us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |  |  |  |
Exercisable at the end of the period (in shares) |  | 3,271,474us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |  |  |  |
Weighted Average Exercise Price |  |  |  |  |  |  |  |
Balance at the beginning of the period (in dollars per share) |  | $ 10.99us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | $ 10.50us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | $ 10.35us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |  |
Options granted (in dollars per share) |  | $ 15.73us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | $ 14.84us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | $ 11.48us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |  |
Options canceled (in dollars per share) |  | $ 17.38us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | $ 13.57us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | $ 9.01us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |  |
Options exercised (in dollars per share) |  | $ 9.69us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | $ 7.24us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | $ 7.89us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |  |
Balance at the end of the period (in dollars per share) |  | $ 11.76us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | $ 10.99us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | $ 10.50us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | $ 10.35us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |
Exercisable at the end of the period (in dollars per share) |  | $ 11.37us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |  |  |  |
Vested or expected to vest at the end of the period (in dollars per share) |  | $ 11.76us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |  |  |  |
Weighted Average Remaining Contractual Term |  |  |  |  |  |  |  |
Balance at the beginning of the period |  | 4 years 1 month 28 days | 4 years 7 months 28 days | 5 years 5 months 27 days | 6 years 3 months 29 days |  |  |
Options granted |  | 9 years 29 days | 9 years 29 days | 9 years 1 month 21 days |  |  |  |
Options exercised |  | 3 years 2 months 16 days | 4 years 6 months 11 days | 6 years 29 days |  |  |  |
Balance at the end of the period |  | 4 years 1 month 28 days | 4 years 7 months 28 days | 5 years 5 months 27 days | 6 years 3 months 29 days |  |  |
Vested or expected to vest at the end of the period |  | 4 years 1 month 28 days |  |  |  |  |  |
Exercisable at the end of the period |  | 3 years 7 months 6 days |  |  |  |  |  |
Aggregate intrinsic value |  |  |  |  |  |  |  |
Options, vested or expected to vest and exercisable (in dollars) |  | 38.1cube_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAndExercisableAggregateIntrinsicValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |  |  |  |
Options exercised (in dollars) |  | 15.5us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |  |  |  |
Share Options | Minimum |  |  |  |  |  |  |  |
Share options, additional general disclosures |  |  |  |  |  |  |  |
Vesting period |  | 3 years |  |  |  |  |  |
Restricted Shares |  |  |  |  |  |  |  |
Share options, additional general disclosures |  |  |  |  |  |  |  |
Compensation expense recognized (in dollars) |  | 3.5us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | 5.4us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | 3.9us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember |  |  |  |
Aggregate grant date fair value of share based awards issued (in dollars) |  | 3.4cube_ShareBasedCompensationArrangementByShareBasedPaymentAwardShareBasedAwardsGrantsInPeriodAggregateGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | 3.4cube_ShareBasedCompensationArrangementByShareBasedPaymentAwardShareBasedAwardsGrantsInPeriodAggregateGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember |  |  |  |  |
Unrecognized compensation cost |  | 3.0us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember |  |  |  |  |  |
Unrecognized compensation cost recorded, period |  | 4 years |  |  |  |  |  |
Number of Non-Vested Restricted Shares |  |  |  |  |  |  |  |
Non-vested at the beginning of the period (in shares) |  | 711,631us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember |  |  |  |  |  |
Granted (in shares) |  | 194,495us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | 219,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember |  |  |  |  |
Vested (in shares) |  | (523,700)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember |  |  |  |  |  |
Forfeited (in shares) |  | (1,643)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember |  |  |  |  |  |
Non-vested at the end of the period (in shares) |  | 380,783us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | 711,631us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember |  |  |  |  |
Restricted Shares | Minimum |  |  |  |  |  |  |  |
Share options, additional general disclosures |  |  |  |  |  |  |  |
Vesting period |  | 3 years |  |  |  |  |  |
Restricted Shares | Maximum |  |  |  |  |  |  |  |
Share options, additional general disclosures |  |  |  |  |  |  |  |
Vesting period |  | 5 years |  |  |  |  |  |
Restricted share units |  |  |  |  |  |  |  |
Share options, additional general disclosures |  |  |  |  |  |  |  |
Aggregate grant date fair value of share based awards issued (in dollars) |  |  |  |  |  | $ 0.9cube_ShareBasedCompensationArrangementByShareBasedPaymentAwardShareBasedAwardsGrantsInPeriodAggregateGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember | $ 0.8cube_ShareBasedCompensationArrangementByShareBasedPaymentAwardShareBasedAwardsGrantsInPeriodAggregateGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember | $ 0.8cube_ShareBasedCompensationArrangementByShareBasedPaymentAwardShareBasedAwardsGrantsInPeriodAggregateGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember
Number of Non-Vested Restricted Shares |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  |  | 47,487us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember | 41,503us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember | 49,981us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember
Restricted share, additional disclosure |  |  |  |  |  |  |  |
Period for calculation of total return to shareholders |  |  |  |  |  | 3 years | 3 years | 3 years
Plans | Share Options | Maximum |  |  |  |  |  |  |  |
SHARE-BASED COMPENSATION PLANS |  |  |  |  |  |  |  |
Maximum term of options |  | 10 years |  |  |  |  |  |
2007 Plan |  |  |  |  |  |  |  |
SHARE-BASED COMPENSATION PLANS |  |  |  |  |  |  |  |
Maximum number of fungible units available for issuance (in shares) |  | 4,728,561cube_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfFungibleUnitsAuthorized / us-gaap_PlanNameAxis = cube_Plan2007Member |  |  |  |  |  |
Additional fungible units available for grant upon expiration or forfeiture of options and restricted share awards |  | 372,135cube_ShareBasedCompensationArrangementByShareBasedPaymentAwardAdditionalNumberOfFungibleUnitsAvailableForGrant / us-gaap_PlanNameAxis = cube_Plan2007Member |  |  |  |  |  |
Number of ratios used to establish an average |  | 3cube_ShareBasedCompensationArrangementByShareBasedPaymentAwardAverageNumberOfRatios / us-gaap_PlanNameAxis = cube_Plan2007Member |  |  |  |  |  |
Maximum percentage limit of the average of three ratios |  | 2.00%cube_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumRatiosLimit / us-gaap_PlanNameAxis = cube_Plan2007Member |  |  |  |  |  |
Maximum number of awards that may be granted to an individual per calendar year (in shares) |  | 1,000,000cube_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumNumberOfAwardsPerEmployeePlanLimit / us-gaap_PlanNameAxis = cube_Plan2007Member |  |  |  |  |  |
2007 Plan | Minimum |  |  |  |  |  |  |  |
SHARE-BASED COMPENSATION PLANS |  |  |  |  |  |  |  |
Share awards conversion ratio to be counted as units against the fungible pool limit |  |  | 1.0cube_ShareBasedCompensationArrangementByShareBasedPaymentsSharesConvertedToFungiblePoolUnits / us-gaap_PlanNameAxis = cube_Plan2007Member / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |  |  |
2007 Plan | Maximum |  |  |  |  |  |  |  |
SHARE-BASED COMPENSATION PLANS |  |  |  |  |  |  |  |
Share awards conversion ratio to be counted as units against the fungible pool limit |  |  | 1.66cube_ShareBasedCompensationArrangementByShareBasedPaymentsSharesConvertedToFungiblePoolUnits / us-gaap_PlanNameAxis = cube_Plan2007Member / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |  |
2007 Plan | Options or share appreciation rights |  |  |  |  |  |  |  |
SHARE-BASED COMPENSATION PLANS |  |  |  |  |  |  |  |
Share awards conversion ratio to be counted as units against the fungible pool limit |  | 1.00cube_ShareBasedCompensationArrangementByShareBasedPaymentsSharesConvertedToFungiblePoolUnits / us-gaap_AwardTypeAxis = cube_EmployeeStockOptionAndStockAppreciationRightsMember / us-gaap_PlanNameAxis = cube_Plan2007Member |  |  |  |  |  |
2007 Plan | Restricted shares or restricted share units |  |  |  |  |  |  |  |
SHARE-BASED COMPENSATION PLANS |  |  |  |  |  |  |  |
Share awards conversion ratio to be counted as units against the fungible pool limit |  | 1.66cube_ShareBasedCompensationArrangementByShareBasedPaymentsSharesConvertedToFungiblePoolUnits / us-gaap_AwardTypeAxis = cube_RestrictedStockMemberAndRestrictedStockUnitsRSUMember / us-gaap_PlanNameAxis = cube_Plan2007Member |  |  |  |  |  |
2007 Plan | Restricted Shares |  |  |  |  |  |  |  |
SHARE-BASED COMPENSATION PLANS |  |  |  |  |  |  |  |
Numerator used to expand the number of Full-Value awards |  | 1.5cube_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesOfRatiosNumeratorFullValueAwards / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_PlanNameAxis = cube_Plan2007Member |  |  |  |  |  |
2004 Plan |  |  |  |  |  |  |  |
SHARE-BASED COMPENSATION PLANS |  |  |  |  |  |  |  |
Maximum number of shares reserved for issuance |  | 3,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_PlanNameAxis = cube_Plan2004Member |  |  |  |  |  |
2004 Plan | Options or share appreciation rights |  |  |  |  |  |  |  |
SHARE-BASED COMPENSATION PLANS |  |  |  |  |  |  |  |
Maximum number of awards that may be granted to an individual per calendar year (in shares) |  | 400,000cube_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumNumberOfAwardsPerEmployeePlanLimit / us-gaap_AwardTypeAxis = cube_EmployeeStockOptionAndStockAppreciationRightsMember / us-gaap_PlanNameAxis = cube_Plan2004Member |  |  |  |  |  |
2004 Plan | Restricted shares or restricted share units |  |  |  |  |  |  |  |
SHARE-BASED COMPENSATION PLANS |  |  |  |  |  |  |  |
Maximum number of awards that may be granted to an individual per calendar year (in shares) |  | 100,000cube_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumNumberOfAwardsPerEmployeePlanLimit / us-gaap_AwardTypeAxis = cube_RestrictedStockMemberAndRestrictedStockUnitsRSUMember / us-gaap_PlanNameAxis = cube_Plan2004Member |  |  |  |  |  |
2004 Plan | Other awards |  |  |  |  |  |  |  |
SHARE-BASED COMPENSATION PLANS |  |  |  |  |  |  |  |
Maximum number of awards that may be granted to an individual per calendar year (in shares) |  | 250,000cube_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumNumberOfAwardsPerEmployeePlanLimit / us-gaap_AwardTypeAxis = cube_OtherEquityAwardsMember / us-gaap_PlanNameAxis = cube_Plan2004Member |  |  |  |  |  |

X
- Definition Represents additional fungible units available for grant when common shares are restored to availability upon expiration or forfeiture of then currently outstanding options or restricted share awards. + References No definition available. + Details
Name: | cube_ShareBasedCompensationArrangementByShareBasedPaymentAwardAdditionalNumberOfFungibleUnitsAvailableForGrant
Namespace Prefix: | cube_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition The of number of ratios that sets an average used to set the overall limit on the number of shares that may be subject to awards under the 2007 plan. + References No definition available. + Details
Name: | cube_ShareBasedCompensationArrangementByShareBasedPaymentAwardAverageNumberOfRatios
Namespace Prefix: | cube_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the expiration period for an equity-based award as specified in the award agreement. + References No definition available. + Details
Name: | cube_ShareBasedCompensationArrangementByShareBasedPaymentAwardExpirationDatePeriod
Namespace Prefix: | cube_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The highest quantity of share awards an employee can be awarded under the plan per period after converting the award under the terms of the plan, if necessary. + References No definition available. + Details
Name: | cube_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumNumberOfAwardsPerEmployeePlanLimit
Namespace Prefix: | cube_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition The average of three ratios (each expressed as a percent) shall not exceed a percentage limit for the three year period ended December 31, 2012. + References No definition available. + Details
Name: | cube_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumRatiosLimit
Namespace Prefix: | cube_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the maximum number of fungible units authorized to be granted by the entity. + References No definition available. + Details
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- Definition Numerator used to expand the number of shares underlying the Full Value Awards for the purposes of calculating the number of shares subject to award limitation. + References No definition available. + Details
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- Definition The weighted-average period between the balance sheet date and expiration date for options that are exercised under the plan, which may be expressed in a decimal value for number of years. + References No definition available. + Details
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- Definition The weighted-average period between the balance sheet date and expiration date for options that are granted under the plan, which may be expressed in a decimal value for number of years. + References No definition available. + Details
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- Definition As of the balance sheet date, the total dollar difference between fair values of the underlying shares reserved for issuance and exercise prices of fully vested and expected to vest options outstanding and currently exercisable under the option plan as of the balance sheet date. + References No definition available. + Details
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- Definition Represents the period for calculation of total return to shareholders based on which deferred share units will be awarded by the entity. + References No definition available. + Details
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- Definition Represents the aggregate grant-date fair value of share based awards granted during the reporting period. + References No definition available. + Details
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- Definition The conversion ratio that the number of units that share-based compensation awards are counted against the fungible pool limit. The share awards are converted into units using a conversion ratio and that unit amount is counted against the fungible pool limit. The purpose of this limit is to calculate the share limitation award. + References No definition available. + Details
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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition Unrecognized cost of unvested share-based compensation awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.D.2) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section D -Subsection 2 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iv) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Net number of share options (or share units) granted during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition As of the balance sheet date, the number of shares into which fully vested and expected to vest stock options outstanding can be converted under the option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition As of the balance sheet date, the weighted-average exercise price for outstanding stock options that are fully vested or expected to vest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for fully vested and expected to vest options outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which option holders acquired shares when converting their stock options into shares. + References No definition available. + Details
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- Definition Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated. + References No definition available. + Details
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- Definition Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options. + References No definition available. + Details
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