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PRO FORMA FINANCIAL INFORMATION (UNAUDITED) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Consolidated results of operations on a pro forma basis
Pro forma revenue	$ 405,171us-gaap_BusinessAcquisitionsProFormaRevenue	$ 378,518us-gaap_BusinessAcquisitionsProFormaRevenue
Pro forma income from continuing operations	59,406us-gaap_BusinessAcquisitionsProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTax	(276)us-gaap_BusinessAcquisitionsProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTax
Earnings (loss) per share from continuing operations:
Basic and diluted - as reported (in dollars per share)	$ 0.13us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare	$ 0.03us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare	$ (0.17)us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations before Changes in Accounting and Extraordinary Items, Net of Tax, Per Share, Basic	$ 0.36us-gaap_BusinessAcquisitionProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTaxPerShareBasic	$ (0.05)us-gaap_BusinessAcquisitionProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTaxPerShareBasic
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations before Changes in Accounting and Extraordinary Items, Net of Tax, Per Share, Diluted	$ 0.35us-gaap_BusinessAcquisitionProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTaxPerShareDiluted	$ (0.05)us-gaap_BusinessAcquisitionProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTaxPerShareDiluted
Self-storage facilities
Self-storage facilities
Number of self-storage facilities acquired (in properties)	53cube_NumberOfRealEstatePropertiesAcquired / cube_SignificantAcquisitionsAndDisposalsByTypeAxis = us-gaap_RealEstateMember
Aggregate purchase or sale price	$ 568,200us-gaap_SignificantAcquisitionsAndDisposalsAcquisitionCostsOrSaleProceeds / cube_SignificantAcquisitionsAndDisposalsByTypeAxis = us-gaap_RealEstateMember	$ 126,400us-gaap_SignificantAcquisitionsAndDisposalsAcquisitionCostsOrSaleProceeds / cube_SignificantAcquisitionsAndDisposalsByTypeAxis = us-gaap_RealEstateMember	$ 60,000us-gaap_SignificantAcquisitionsAndDisposalsAcquisitionCostsOrSaleProceeds / cube_SignificantAcquisitionsAndDisposalsByTypeAxis = us-gaap_RealEstateMember

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