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MORTGAGE LOANS AND NOTES PAYABLE (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Mortgage loans and Notes payable
Carrying value	$ 192,367us-gaap_DebtInstrumentCarryingAmount
Unamortized fair value adjustment	3,484cube_DebtInstrumentUnamortizedFairValueAdjustment	3,674cube_DebtInstrumentUnamortizedFairValueAdjustment
Total mortgage loans and notes payable	195,851us-gaap_NotesAndLoansPayable	200,218us-gaap_NotesAndLoansPayable
Net book value of self-storage facilities	2,625,129us-gaap_RealEstateInvestmentPropertyNet	2,155,170us-gaap_RealEstateInvestmentPropertyNet
YSI 10
Mortgage loans and Notes payable
Carrying value		3,839us-gaap_DebtInstrumentCarryingAmount / cube_MortgageLoansOnRealEstateByPortfolioAxis = cube_YSI10LoanMember
Effective interest rate (as a percent)	5.87%us-gaap_DebtInstrumentInterestRateEffectivePercentage / cube_MortgageLoansOnRealEstateByPortfolioAxis = cube_YSI10LoanMember
YSI 15
Mortgage loans and Notes payable
Carrying value		1,733us-gaap_DebtInstrumentCarryingAmount / cube_MortgageLoansOnRealEstateByPortfolioAxis = cube_YSI15LoanMember
Effective interest rate (as a percent)	6.41%us-gaap_DebtInstrumentInterestRateEffectivePercentage / cube_MortgageLoansOnRealEstateByPortfolioAxis = cube_YSI15LoanMember
YSI 52
Mortgage loans and Notes payable
Carrying value		4,548us-gaap_DebtInstrumentCarryingAmount / cube_MortgageLoansOnRealEstateByPortfolioAxis = cube_YSI52LoanMember
Effective interest rate (as a percent)	5.63%us-gaap_DebtInstrumentInterestRateEffectivePercentage / cube_MortgageLoansOnRealEstateByPortfolioAxis = cube_YSI52LoanMember
YSI 58
Mortgage loans and Notes payable
Carrying value		8,676us-gaap_DebtInstrumentCarryingAmount / cube_MortgageLoansOnRealEstateByPortfolioAxis = cube_YSI58LoanMember
Effective interest rate (as a percent)	2.97%us-gaap_DebtInstrumentInterestRateEffectivePercentage / cube_MortgageLoansOnRealEstateByPortfolioAxis = cube_YSI58LoanMember
YSI 29
Mortgage loans and Notes payable
Carrying value	12,635us-gaap_DebtInstrumentCarryingAmount / cube_MortgageLoansOnRealEstateByPortfolioAxis = cube_YSI29LoanMember	12,853us-gaap_DebtInstrumentCarryingAmount / cube_MortgageLoansOnRealEstateByPortfolioAxis = cube_YSI29LoanMember
Effective interest rate (as a percent)	3.69%us-gaap_DebtInstrumentInterestRateEffectivePercentage / cube_MortgageLoansOnRealEstateByPortfolioAxis = cube_YSI29LoanMember
YSI 13
Mortgage loans and Notes payable
Carrying value	8,427us-gaap_DebtInstrumentCarryingAmount / cube_MortgageLoansOnRealEstateByPortfolioAxis = cube_YSI13LoanMember	8,500us-gaap_DebtInstrumentCarryingAmount / cube_MortgageLoansOnRealEstateByPortfolioAxis = cube_YSI13LoanMember
Effective interest rate (as a percent)	3.00%us-gaap_DebtInstrumentInterestRateEffectivePercentage / cube_MortgageLoansOnRealEstateByPortfolioAxis = cube_YSI13LoanMember
YSI 20
Mortgage loans and Notes payable
Carrying value	54,091us-gaap_DebtInstrumentCarryingAmount / cube_MortgageLoansOnRealEstateByPortfolioAxis = cube_YSI20LoanMember	56,373us-gaap_DebtInstrumentCarryingAmount / cube_MortgageLoansOnRealEstateByPortfolioAxis = cube_YSI20LoanMember
Effective interest rate (as a percent)	5.97%us-gaap_DebtInstrumentInterestRateEffectivePercentage / cube_MortgageLoansOnRealEstateByPortfolioAxis = cube_YSI20LoanMember
YSI 63
Mortgage loans and Notes payable
Carrying value	7,466us-gaap_DebtInstrumentCarryingAmount / cube_MortgageLoansOnRealEstateByPortfolioAxis = cube_YSI63LoanMember
Effective interest rate (as a percent)	2.82%us-gaap_DebtInstrumentInterestRateEffectivePercentage / cube_MortgageLoansOnRealEstateByPortfolioAxis = cube_YSI63LoanMember
YSI 59
Mortgage loans and Notes payable
Carrying value	9,221us-gaap_DebtInstrumentCarryingAmount / cube_MortgageLoansOnRealEstateByPortfolioAxis = cube_YSI59LoanMember	9,418us-gaap_DebtInstrumentCarryingAmount / cube_MortgageLoansOnRealEstateByPortfolioAxis = cube_YSI59LoanMember
Effective interest rate (as a percent)	4.82%us-gaap_DebtInstrumentInterestRateEffectivePercentage / cube_MortgageLoansOnRealEstateByPortfolioAxis = cube_YSI59LoanMember
YSI 60
Mortgage loans and Notes payable
Carrying value	3,610us-gaap_DebtInstrumentCarryingAmount / cube_MortgageLoansOnRealEstateByPortfolioAxis = cube_YSI60LoanMember	3,670us-gaap_DebtInstrumentCarryingAmount / cube_MortgageLoansOnRealEstateByPortfolioAxis = cube_YSI60LoanMember
Effective interest rate (as a percent)	5.04%us-gaap_DebtInstrumentInterestRateEffectivePercentage / cube_MortgageLoansOnRealEstateByPortfolioAxis = cube_YSI60LoanMember
YSI 51
Mortgage loans and Notes payable
Carrying value	7,105us-gaap_DebtInstrumentCarryingAmount / cube_MortgageLoansOnRealEstateByPortfolioAxis = cube_YSI51LoanMember	7,219us-gaap_DebtInstrumentCarryingAmount / cube_MortgageLoansOnRealEstateByPortfolioAxis = cube_YSI51LoanMember
Effective interest rate (as a percent)	5.15%us-gaap_DebtInstrumentInterestRateEffectivePercentage / cube_MortgageLoansOnRealEstateByPortfolioAxis = cube_YSI51LoanMember
YSI 64
Mortgage loans and Notes payable
Carrying value	7,919us-gaap_DebtInstrumentCarryingAmount / cube_MortgageLoansOnRealEstateByPortfolioAxis = cube_YSI64LoanMember
Effective interest rate (as a percent)	3.54%us-gaap_DebtInstrumentInterestRateEffectivePercentage / cube_MortgageLoansOnRealEstateByPortfolioAxis = cube_YSI64LoanMember
YSI 62
Mortgage loans and Notes payable
Carrying value	7,962us-gaap_DebtInstrumentCarryingAmount / cube_MortgageLoansOnRealEstateByPortfolioAxis = cube_YSI62LoanMember
Effective interest rate (as a percent)	3.54%us-gaap_DebtInstrumentInterestRateEffectivePercentage / cube_MortgageLoansOnRealEstateByPortfolioAxis = cube_YSI62LoanMember
YSI 35
Mortgage loans and Notes payable
Carrying value		4,274us-gaap_DebtInstrumentCarryingAmount / cube_MortgageLoansOnRealEstateByPortfolioAxis = cube_YSI35LoanMember
Effective interest rate (as a percent)	6.90%us-gaap_DebtInstrumentInterestRateEffectivePercentage / cube_MortgageLoansOnRealEstateByPortfolioAxis = cube_YSI35LoanMember
YSI 33
Mortgage loans and Notes payable
Carrying value	10,429us-gaap_DebtInstrumentCarryingAmount / cube_MortgageLoansOnRealEstateByPortfolioAxis = cube_YSI33LoanMember	10,688us-gaap_DebtInstrumentCarryingAmount / cube_MortgageLoansOnRealEstateByPortfolioAxis = cube_YSI33LoanMember
Effective interest rate (as a percent)	6.42%us-gaap_DebtInstrumentInterestRateEffectivePercentage / cube_MortgageLoansOnRealEstateByPortfolioAxis = cube_YSI33LoanMember
YSI 26
Mortgage loans and Notes payable
Carrying value	8,780us-gaap_DebtInstrumentCarryingAmount / cube_MortgageLoansOnRealEstateByPortfolioAxis = cube_YSI26LoanMember	8,945us-gaap_DebtInstrumentCarryingAmount / cube_MortgageLoansOnRealEstateByPortfolioAxis = cube_YSI26LoanMember
Effective interest rate (as a percent)	4.56%us-gaap_DebtInstrumentInterestRateEffectivePercentage / cube_MortgageLoansOnRealEstateByPortfolioAxis = cube_YSI26LoanMember
YSI 57
Mortgage loans and Notes payable
Carrying value	3,082us-gaap_DebtInstrumentCarryingAmount / cube_MortgageLoansOnRealEstateByPortfolioAxis = cube_YSI57LoanMember	3,140us-gaap_DebtInstrumentCarryingAmount / cube_MortgageLoansOnRealEstateByPortfolioAxis = cube_YSI57LoanMember
Effective interest rate (as a percent)	4.61%us-gaap_DebtInstrumentInterestRateEffectivePercentage / cube_MortgageLoansOnRealEstateByPortfolioAxis = cube_YSI57LoanMember
YSI 55
Mortgage loans and Notes payable
Carrying value	23,767us-gaap_DebtInstrumentCarryingAmount / cube_MortgageLoansOnRealEstateByPortfolioAxis = cube_YSI55LoanMember	24,145us-gaap_DebtInstrumentCarryingAmount / cube_MortgageLoansOnRealEstateByPortfolioAxis = cube_YSI55LoanMember
Effective interest rate (as a percent)	4.85%us-gaap_DebtInstrumentInterestRateEffectivePercentage / cube_MortgageLoansOnRealEstateByPortfolioAxis = cube_YSI55LoanMember
YSI 24
Mortgage loans and Notes payable
Carrying value	27,873us-gaap_DebtInstrumentCarryingAmount / cube_MortgageLoansOnRealEstateByPortfolioAxis = cube_YSI24LoanMember	28,523us-gaap_DebtInstrumentCarryingAmount / cube_MortgageLoansOnRealEstateByPortfolioAxis = cube_YSI24LoanMember
Effective interest rate (as a percent)	4.64%us-gaap_DebtInstrumentInterestRateEffectivePercentage / cube_MortgageLoansOnRealEstateByPortfolioAxis = cube_YSI24LoanMember
Mortgage Loans
Mortgage loans and Notes payable
Net book value of self-storage facilities	$ 344,000us-gaap_RealEstateInvestmentPropertyNet / cube_MortgageLoansOnRealEstateByPortfolioAxis = us-gaap_MortgageLoansOnRealEstateMember	$ 371,000us-gaap_RealEstateInvestmentPropertyNet / cube_MortgageLoansOnRealEstateByPortfolioAxis = us-gaap_MortgageLoansOnRealEstateMember

X

- Definition

The amount of fair value adjustment that was originally recognized at the issuance of the instrument that has yet to be amortized.

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Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer.

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-Publisher SEC

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of all notes and loans payable (with maturities initially due after one year or beyond the operating cycle if longer).

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Number 210

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Amount of real estate investment property, net of accumulated depreciation, which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments.

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