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CONSOLIDATED STATEMENTS OF EQUITY (USD $) In Thousands, except Share data, unless otherwise specified | Total Shareholders' Equity | Common Shares | Preferred Shares | Additional Paid-in Capital | Accumulated Other Comprehensive (Loss) | Accumulated Deficit | Noncontrolling Interest in Subsidiaries | Operating Partnership Interests of third parties | Total
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance of Noncontrolling Interests in the Operating Partnership at Dec. 31, 2011 |  |  |  |  |  |  |  | $ 49,732us-gaap_TemporaryEquityCarryingAmountAttributableToNoncontrollingInterest / cube_TemporaryEquityAxis = cube_TemporaryEquityMember |
Balance at Dec. 31, 2011 | 955,913us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember | 1,221us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 31us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember | 1,309,505us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | (12,831)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (342,013)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 39,409us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  | 995,322us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
Balance (in shares) at Dec. 31, 2011 |  | 122,059,000us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 3,100,000us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |
Issuance of common shares, net | 102,079us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember | 79us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  | 102,000us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  | 102,079us-gaap_StockIssuedDuringPeriodValueNewIssues
Issuance of common shares, net (in shares) |  | 7,900,000us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |  |
Issuance of restricted shares | 2us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember | 2us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |  | 2us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross
Issuance of restricted shares (in shares) |  | 246,000us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |  |
Conversion from units to shares | 19,247us-gaap_StockIssuedDuringPeriodValueConversionOfUnits / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember | 14us-gaap_StockIssuedDuringPeriodValueConversionOfUnits / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  | 19,233us-gaap_StockIssuedDuringPeriodValueConversionOfUnits / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  | (19,247)us-gaap_StockIssuedDuringPeriodValueConversionOfUnits / cube_TemporaryEquityAxis = cube_TemporaryEquityMember | 19,247us-gaap_StockIssuedDuringPeriodValueConversionOfUnits
Conversion from units to shares (in shares) |  | 1,380,000us-gaap_StockIssuedDuringPeriodSharesConversionOfUnits / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |  |
Exercise of stock options | 1,629us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember | 2us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  | 1,627us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  | 1,629us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
Exercise of stock options (in shares) |  | 210,000us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |  |
Amortization of restricted shares | 3,352cube_AdjustmentsToAdditionalPaidInCapitalAmortizationOfRestrictedStock / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  | 3,352cube_AdjustmentsToAdditionalPaidInCapitalAmortizationOfRestrictedStock / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  | 3,352cube_AdjustmentsToAdditionalPaidInCapitalAmortizationOfRestrictedStock
Share compensation expense | 1,198us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  | 1,198us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  | 1,198us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
Acquisition of noncontrolling interest | (18,452)us-gaap_MinorityInterestDecreaseFromRedemptions / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  | (18,452)us-gaap_MinorityInterestDecreaseFromRedemptions / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | (38,532)us-gaap_MinorityInterestDecreaseFromRedemptions / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | (132)us-gaap_MinorityInterestDecreaseFromRedemptions / cube_TemporaryEquityAxis = cube_TemporaryEquityMember | (56,984)us-gaap_MinorityInterestDecreaseFromRedemptions
Adjustment for noncontrolling interest in the Operating Partnership | (19,520)us-gaap_MinorityInterestChangeInRedemptionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  |  | (19,520)us-gaap_MinorityInterestChangeInRedemptionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | 19,520us-gaap_MinorityInterestChangeInRedemptionValue / cube_TemporaryEquityAxis = cube_TemporaryEquityMember | (19,520)us-gaap_MinorityInterestChangeInRedemptionValue
Net income (loss) | 1,817us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  |  | 1,817us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 1,918us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | (107)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / cube_TemporaryEquityAxis = cube_TemporaryEquityMember | (4,191)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Net income (loss), including temporary equity |  |  |  |  |  |  |  |  | 3,735cube_ProfitLossIncludingTemporaryEquityNetIncomeLoss
Other comprehensive income (loss): |  |  |  |  |  |  |  |  |
Unrealized gains (losses) on interest rate swaps | (7,124)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  | (7,124)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |  | (342)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax / cube_TemporaryEquityAxis = cube_TemporaryEquityMember | (7,124)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax
Unrealized (loss) gain on foreign currency translation | 159us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  | 159us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  | 9us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | 4us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / cube_TemporaryEquityAxis = cube_TemporaryEquityMember | 168us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
Preferred share distributions | (6,008)us-gaap_DividendsPreferredStock / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  |  | (6,008)us-gaap_DividendsPreferredStock / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  | (6,008)us-gaap_DividendsPreferredStock
Common share distributions | (44,501)us-gaap_DividendsCommonStock / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  |  | (44,501)us-gaap_DividendsCommonStock / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (2,686)us-gaap_DividendsCommonStock / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | (1,438)us-gaap_DividendsCommonStock / cube_TemporaryEquityAxis = cube_TemporaryEquityMember | (47,187)us-gaap_DividendsCommonStock
Balance of Noncontrolling Interests in the Operating Partnership at Dec. 31, 2012 |  |  |  |  |  |  |  | 47,990us-gaap_TemporaryEquityCarryingAmountAttributableToNoncontrollingInterest / cube_TemporaryEquityAxis = cube_TemporaryEquityMember |
Balance at Dec. 31, 2012 | 989,791us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember | 1,318us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 31us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember | 1,418,463us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | (19,796)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (410,225)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 118us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  | 989,909us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
Balance (in shares) at Dec. 31, 2012 |  | 131,795,000us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 3,100,000us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |
Contributions from noncontrolling interests in subsidiaries |  |  |  |  |  |  | 831us-gaap_NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  | 831us-gaap_NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance
Issuance of common shares, net | 100,287us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember | 57us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  | 100,230us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  | 100,287us-gaap_StockIssuedDuringPeriodValueNewIssues
Issuance of common shares, net (in shares) |  | 5,700,000us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |  |
Issuance of restricted shares | 3us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember | 3us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |  | 3us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross
Issuance of restricted shares (in shares) |  | 301,000us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |  |
Conversion from units to shares | 14,698us-gaap_StockIssuedDuringPeriodValueConversionOfUnits / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember | 10us-gaap_StockIssuedDuringPeriodValueConversionOfUnits / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  | 14,688us-gaap_StockIssuedDuringPeriodValueConversionOfUnits / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  | (14,698)us-gaap_StockIssuedDuringPeriodValueConversionOfUnits / cube_TemporaryEquityAxis = cube_TemporaryEquityMember | 14,698us-gaap_StockIssuedDuringPeriodValueConversionOfUnits
Conversion from units to shares (in shares) |  | 1,018,000us-gaap_StockIssuedDuringPeriodSharesConversionOfUnits / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |  |
Exercise of stock options | 3,710us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember | 5us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  | 3,705us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  | 3,710us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
Exercise of stock options (in shares) |  | 514,000us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |  |
Amortization of restricted shares | 4,747cube_AdjustmentsToAdditionalPaidInCapitalAmortizationOfRestrictedStock / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  | 4,747cube_AdjustmentsToAdditionalPaidInCapitalAmortizationOfRestrictedStock / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  | 4,747cube_AdjustmentsToAdditionalPaidInCapitalAmortizationOfRestrictedStock
Share compensation expense | 870us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  | 870us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  | 870us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
Adjustment for noncontrolling interest in the Operating Partnership | (3,292)us-gaap_MinorityInterestChangeInRedemptionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  |  | (3,292)us-gaap_MinorityInterestChangeInRedemptionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | 3,292us-gaap_MinorityInterestChangeInRedemptionValue / cube_TemporaryEquityAxis = cube_TemporaryEquityMember | (3,292)us-gaap_MinorityInterestChangeInRedemptionValue
Net income (loss) | 41,448us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  |  | 41,448us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (42)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | 588us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / cube_TemporaryEquityAxis = cube_TemporaryEquityMember | 35,440us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Net income (loss), including temporary equity |  |  |  |  |  |  |  |  | 41,406cube_ProfitLossIncludingTemporaryEquityNetIncomeLoss
Other comprehensive income (loss): |  |  |  |  |  |  |  |  |
Unrealized gains (losses) on interest rate swaps | 8,751us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  | 8,751us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |  | 151us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax / cube_TemporaryEquityAxis = cube_TemporaryEquityMember | 8,751us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax
Unrealized (loss) gain on foreign currency translation | 31us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  | 31us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  | 24us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | 1us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / cube_TemporaryEquityAxis = cube_TemporaryEquityMember | 55us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
Preferred share distributions | (6,008)us-gaap_DividendsPreferredStock / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  |  | (6,008)us-gaap_DividendsPreferredStock / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  | (6,008)us-gaap_DividendsPreferredStock
Common share distributions | (62,760)us-gaap_DividendsCommonStock / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  |  | (62,760)us-gaap_DividendsCommonStock / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | (1,049)us-gaap_DividendsCommonStock / cube_TemporaryEquityAxis = cube_TemporaryEquityMember | (62,760)us-gaap_DividendsCommonStock
Balance of Noncontrolling Interests in the Operating Partnership at Dec. 31, 2013 |  |  |  |  |  |  |  | 36,275us-gaap_TemporaryEquityCarryingAmountAttributableToNoncontrollingInterest / cube_TemporaryEquityAxis = cube_TemporaryEquityMember | 36,275us-gaap_TemporaryEquityCarryingAmountAttributableToNoncontrollingInterest
Balance at Dec. 31, 2013 | 1,092,276us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember | 1,393us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 31us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember | 1,542,703us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | (11,014)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (440,837)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 931us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  | 1,093,207us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
Balance (in shares) at Dec. 31, 2013 |  | 139,328,000us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 3,100,000us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |
Contributions from noncontrolling interests in subsidiaries |  |  |  |  |  |  | 642us-gaap_NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  | 642us-gaap_NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance
Issuance of common shares, net | 416,001us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember | 227us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  | 415,774us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  | 416,001us-gaap_StockIssuedDuringPeriodValueNewIssues
Issuance of common shares, net (in shares) |  | 22,704,000us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |  |
Issuance of restricted shares | 5us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember | 5us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |  | 5us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross
Issuance of restricted shares (in shares) |  | 482,000us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |  |
Conversion from units to shares | 308us-gaap_StockIssuedDuringPeriodValueConversionOfUnits / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  | 308us-gaap_StockIssuedDuringPeriodValueConversionOfUnits / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  | (308)us-gaap_StockIssuedDuringPeriodValueConversionOfUnits / cube_TemporaryEquityAxis = cube_TemporaryEquityMember | 308us-gaap_StockIssuedDuringPeriodValueConversionOfUnits
Conversion from units to shares (in shares) |  | 18,000us-gaap_StockIssuedDuringPeriodSharesConversionOfUnits / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |  |
Exercise of stock options | 13,802us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember | 14us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  | 13,788us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  | 13,802us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
Exercise of stock options (in shares) |  | 1,425,000us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |  |
Amortization of restricted shares | 182cube_AdjustmentsToAdditionalPaidInCapitalAmortizationOfRestrictedStock / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  | 182cube_AdjustmentsToAdditionalPaidInCapitalAmortizationOfRestrictedStock / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  | 182cube_AdjustmentsToAdditionalPaidInCapitalAmortizationOfRestrictedStock
Share compensation expense | 1,553us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  | 1,553us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  | 1,553us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
Adjustment for noncontrolling interest in the Operating Partnership | (14,761)us-gaap_MinorityInterestChangeInRedemptionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  |  | (14,761)us-gaap_MinorityInterestChangeInRedemptionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | 14,761us-gaap_MinorityInterestChangeInRedemptionValue / cube_TemporaryEquityAxis = cube_TemporaryEquityMember | (14,761)us-gaap_MinorityInterestChangeInRedemptionValue
Net income (loss) | 26,379us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  |  | 26,379us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 16us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | 307us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / cube_TemporaryEquityAxis = cube_TemporaryEquityMember | 20,371us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Net income (loss), including temporary equity |  |  |  |  |  |  |  |  | 26,395cube_ProfitLossIncludingTemporaryEquityNetIncomeLoss
Other comprehensive income (loss): |  |  |  |  |  |  |  |  |
Unrealized gains (losses) on interest rate swaps | 2,427us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  | 2,427us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |  | 37us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax / cube_TemporaryEquityAxis = cube_TemporaryEquityMember | 2,427us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax
Unrealized (loss) gain on foreign currency translation | (172)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  | (172)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  | 3us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | (6)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / cube_TemporaryEquityAxis = cube_TemporaryEquityMember | (169)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
Preferred share distributions | (6,008)us-gaap_DividendsPreferredStock / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  |  | (6,008)us-gaap_DividendsPreferredStock / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  | (6,008)us-gaap_DividendsPreferredStock
Common share distributions | (83,966)us-gaap_DividendsCommonStock / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  |  | (83,966)us-gaap_DividendsCommonStock / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | (1,243)us-gaap_DividendsCommonStock / cube_TemporaryEquityAxis = cube_TemporaryEquityMember | (83,966)us-gaap_DividendsCommonStock
Balance of Noncontrolling Interests in the Operating Partnership at Dec. 31, 2014 |  |  |  |  |  |  |  | 49,823us-gaap_TemporaryEquityCarryingAmountAttributableToNoncontrollingInterest / cube_TemporaryEquityAxis = cube_TemporaryEquityMember | 49,823us-gaap_TemporaryEquityCarryingAmountAttributableToNoncontrollingInterest
Balance at Dec. 31, 2014 | $ 1,448,026us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember | $ 1,639us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 31us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember | $ 1,974,308us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ (8,759)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ (519,193)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ 1,592us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  | $ 1,449,618us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
Balance (in shares) at Dec. 31, 2014 |  | 163,957,000us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 3,100,000us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember |  |  |  |  |  |

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- Definition Value of stock issued as a result of the exercise of stock options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29-31) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 + Details
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- Definition Carrying amount, attributable to noncontrolling interests, of an entity's issued and outstanding stock which is not included within permanent equity. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. Includes stock with a put option held by an ESOP and stock redeemable by a holder only in the event of a change in control of the issuer. + References No definition available. + Details
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