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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
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Balance at Dec. 31, 2011 955,913us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
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= us-gaap_ParentMember
1,221us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
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= us-gaap_CommonStockMember
31us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
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= us-gaap_PreferredStockMember
1,309,505us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
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= us-gaap_AdditionalPaidInCapitalMember
(12,831)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
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= us-gaap_AccumulatedOtherComprehensiveIncomeMember
(342,013)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
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= 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
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= 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
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= 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
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= us-gaap_CommonStockMember
             
Conversion from units to shares 19,247us-gaap_StockIssuedDuringPeriodValueConversionOfUnits
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= 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
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= 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
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= us-gaap_CommonStockMember
             
Amortization of restricted shares 3,352cube_AdjustmentsToAdditionalPaidInCapitalAmortizationOfRestrictedStock
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= 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
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= 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
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= us-gaap_ParentMember
        1,817us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
1,918us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
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= 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
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= 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
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= us-gaap_ParentMember
      159us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
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= us-gaap_AccumulatedOtherComprehensiveIncomeMember
  9us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
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= us-gaap_NoncontrollingInterestMember
4us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
/ cube_TemporaryEquityAxis
= cube_TemporaryEquityMember
168us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
Preferred share distributions (6,008)us-gaap_DividendsPreferredStock
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        (6,008)us-gaap_DividendsPreferredStock
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= us-gaap_RetainedEarningsMember
    (6,008)us-gaap_DividendsPreferredStock
Common share distributions (44,501)us-gaap_DividendsCommonStock
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        (44,501)us-gaap_DividendsCommonStock
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= us-gaap_RetainedEarningsMember
(2,686)us-gaap_DividendsCommonStock
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(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
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= us-gaap_ParentMember
1,318us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
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= us-gaap_CommonStockMember
31us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
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= 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
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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
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= 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
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= us-gaap_ParentMember
10us-gaap_StockIssuedDuringPeriodValueConversionOfUnits
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= 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
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= 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
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= us-gaap_ParentMember
    4,747cube_AdjustmentsToAdditionalPaidInCapitalAmortizationOfRestrictedStock
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= 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
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= us-gaap_ParentMember
        (3,292)us-gaap_MinorityInterestChangeInRedemptionValue
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  3,292us-gaap_MinorityInterestChangeInRedemptionValue
/ cube_TemporaryEquityAxis
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(3,292)us-gaap_MinorityInterestChangeInRedemptionValue
Net income (loss) 41,448us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
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        41,448us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
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(42)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
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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
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= us-gaap_ParentMember
      8,751us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax
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= us-gaap_AccumulatedOtherComprehensiveIncomeMember
    151us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax
/ cube_TemporaryEquityAxis
= cube_TemporaryEquityMember
8,751us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax
Unrealized (loss) gain on foreign currency translation 31us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
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= us-gaap_ParentMember
      31us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
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= us-gaap_AccumulatedOtherComprehensiveIncomeMember
  24us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
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1us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
/ cube_TemporaryEquityAxis
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55us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
Preferred share distributions (6,008)us-gaap_DividendsPreferredStock
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= us-gaap_ParentMember
        (6,008)us-gaap_DividendsPreferredStock
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    (6,008)us-gaap_DividendsPreferredStock
Common share distributions (62,760)us-gaap_DividendsCommonStock
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= us-gaap_ParentMember
        (62,760)us-gaap_DividendsCommonStock
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  (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
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36,275us-gaap_TemporaryEquityCarryingAmountAttributableToNoncontrollingInterest
Balance at Dec. 31, 2013 1,092,276us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
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= us-gaap_ParentMember
1,393us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
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= us-gaap_CommonStockMember
31us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
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= us-gaap_PreferredStockMember
1,542,703us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
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(11,014)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
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(440,837)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
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931us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
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= us-gaap_NoncontrollingInterestMember
  1,093,207us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
Balance (in shares) at Dec. 31, 2013   139,328,000us-gaap_SharesIssued
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= us-gaap_CommonStockMember
3,100,000us-gaap_SharesIssued
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Increase (Decrease) in Stockholders' Equity                  
Contributions from noncontrolling interests in subsidiaries             642us-gaap_NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance
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= us-gaap_NoncontrollingInterestMember
  642us-gaap_NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance
Issuance of common shares, net 416,001us-gaap_StockIssuedDuringPeriodValueNewIssues
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= us-gaap_ParentMember
227us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
  415,774us-gaap_StockIssuedDuringPeriodValueNewIssues
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= us-gaap_AdditionalPaidInCapitalMember
        416,001us-gaap_StockIssuedDuringPeriodValueNewIssues
Issuance of common shares, net (in shares)   22,704,000us-gaap_StockIssuedDuringPeriodSharesNewIssues
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= us-gaap_CommonStockMember
             
Issuance of restricted shares 5us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross
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= 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
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= us-gaap_CommonStockMember
             
Conversion from units to shares 308us-gaap_StockIssuedDuringPeriodValueConversionOfUnits
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= 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
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= 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
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= 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