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EARNINGS PER SHARE AND UNIT AND SHAREHOLDERS' EQUITY AND CAPITAL (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
EARNINGS PER SHARE AND UNIT AND SHAREHOLDERS' EQUITY AND CAPITAL |  |  |  |  |  |  |  |  |  |  |
Income (Loss) from continuing operations |  |  |  |  |  |  |  |  | $ 26,366us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | $ 10,409us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | $ (13,276)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
Noncontrolling interests in the Operating Partnership |  |  |  |  |  |  |  |  | (302)cube_NetIncomeLossFromContinuingOperationsAttributableToRedeemableNoncontrollingInterest | (51)cube_NetIncomeLossFromContinuingOperationsAttributableToRedeemableNoncontrollingInterest | 513cube_NetIncomeLossFromContinuingOperationsAttributableToRedeemableNoncontrollingInterest
Noncontrolling interest in subsidiaries |  |  |  |  |  |  |  |  | (16)us-gaap_NoncontrollingInterestInNetIncomeLossOtherNoncontrollingInterestsRedeemable | 42us-gaap_NoncontrollingInterestInNetIncomeLossOtherNoncontrollingInterestsRedeemable | (1,918)us-gaap_NoncontrollingInterestInNetIncomeLossOtherNoncontrollingInterestsRedeemable
Distribution to preferred shares |  |  |  |  |  |  |  |  | (6,008)us-gaap_PreferredStockDividendsIncomeStatementImpact | (6,008)us-gaap_PreferredStockDividendsIncomeStatementImpact | (6,008)us-gaap_PreferredStockDividendsIncomeStatementImpact
Income (Loss) from continuing operations attributable to the Company's common shareholders |  |  |  |  |  |  |  |  | 20,040us-gaap_IncomeLossFromContinuingOperations | 4,392us-gaap_IncomeLossFromContinuingOperations | (20,689)us-gaap_IncomeLossFromContinuingOperations
Total discontinued operations |  |  |  |  |  |  |  |  | 336us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 31,585us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 16,904us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax
Noncontrolling interests in the Operating Partnership |  |  |  |  |  |  |  |  | (5)cube_NetIncomeLossFromDiscontinuedOperationsAttributableToRedeemableNoncontrollingInterest | (537)cube_NetIncomeLossFromDiscontinuedOperationsAttributableToRedeemableNoncontrollingInterest | (406)cube_NetIncomeLossFromDiscontinuedOperationsAttributableToRedeemableNoncontrollingInterest
Total discontinued operations attributable to the Company's common shareholders |  |  |  |  |  |  |  |  | 331us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | 31,048us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | 16,498us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity
NET INCOME (LOSS) ATTRIBUTABLE TO THE COMPANY'S COMMON SHAREHOLDERS |  |  |  |  |  |  |  |  | $ 20,371us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 35,440us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ (4,191)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Weighted-average shares outstanding (in shares) |  |  |  |  |  |  |  |  | 149,107,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 135,191,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 124,548,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Share options and restricted share units (in shares) |  |  |  |  |  |  |  |  | 1,756,000us-gaap_WeightedAverageNumberOfSharesRestrictedStock | 2,551,000us-gaap_WeightedAverageNumberOfSharesRestrictedStock |
Weighted-average diluted shares outstanding (in shares) |  |  |  |  |  |  |  |  | 150,863,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 137,742,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 124,548,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Earnings (loss) per common share |  |  |  |  |  |  |  |  |  |  |
Continuing operations (in dollars per share) |  |  |  |  |  |  |  |  | $ 0.13us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare | $ 0.03us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare | $ (0.17)us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare
Discontinued operations (in dollars per share) |  |  |  |  |  |  |  |  | $ 0.01us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicAndDilutedShare | $ 0.23us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicAndDilutedShare | $ 0.14us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicAndDilutedShare
Basic and diluted earnings (loss) per common share (in dollars per share) | $ 0.02us-gaap_EarningsPerShareBasicAndDiluted | $ 0.05us-gaap_EarningsPerShareBasicAndDiluted | $ 0.04us-gaap_EarningsPerShareBasicAndDiluted | $ 0.03us-gaap_EarningsPerShareBasicAndDiluted | $ 0.15us-gaap_EarningsPerShareBasicAndDiluted | $ 0.11us-gaap_EarningsPerShareBasicAndDiluted | $ 0.01us-gaap_EarningsPerShareBasicAndDiluted | $ (0.01)us-gaap_EarningsPerShareBasicAndDiluted | $ 0.14us-gaap_EarningsPerShareBasicAndDiluted | $ 0.26us-gaap_EarningsPerShareBasicAndDiluted | $ (0.03)us-gaap_EarningsPerShareBasicAndDiluted
Preferred stock, cash dividends declared (in dollars per share) |  |  |  |  |  |  |  |  | $ 1.938us-gaap_PreferredStockDividendsPerShareDeclared | $ 1.938us-gaap_PreferredStockDividendsPerShareDeclared | $ 1.938us-gaap_PreferredStockDividendsPerShareDeclared
Potentially dilutive shares not included in the earnings per share calculation as their effect is antidilutive (in shares) |  |  |  |  |  |  |  |  |  |  | 2,000,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Potential dilutive securities included in the calculation of diluted earnings per share (in shares) |  |  |  |  |  |  |  |  | 1,756,000us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements | 2,551,000us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements |
Common stock, cash dividends declared (in dollars per share) |  |  |  |  |  |  |  |  | $ 0.550us-gaap_CommonStockDividendsPerShareDeclared | $ 0.460us-gaap_CommonStockDividendsPerShareDeclared | $ 0.350us-gaap_CommonStockDividendsPerShareDeclared
Outstanding units of noncontrolling interest in the Operating Partnership (in shares) | 2,257,486us-gaap_TemporaryEquitySharesOutstanding |  |  |  | 2,275,730us-gaap_TemporaryEquitySharesOutstanding |  |  |  | 2,257,486us-gaap_TemporaryEquitySharesOutstanding | 2,275,730us-gaap_TemporaryEquitySharesOutstanding | 3,293,730us-gaap_TemporaryEquitySharesOutstanding
Common shares, shares outstanding | 163,956,675us-gaap_CommonStockSharesOutstanding |  |  |  | 139,328,366us-gaap_CommonStockSharesOutstanding |  |  |  | 163,956,675us-gaap_CommonStockSharesOutstanding | 139,328,366us-gaap_CommonStockSharesOutstanding | 131,794,547us-gaap_CommonStockSharesOutstanding

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