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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Operating Partnership Ownership
Increase to OP units owned by third parties and a corresponding decrease to capital	$ 14,761us-gaap_MinorityInterestChangeInRedemptionValue	$ 3,292us-gaap_MinorityInterestChangeInRedemptionValue	$ 19,520us-gaap_MinorityInterestChangeInRedemptionValue
Minimum
Depreciation and Amortization
Useful lives of self-storage facilities and improvements	5 years
Maximum
Depreciation and Amortization
Useful lives of self-storage facilities and improvements	39 years
CubeSmart, L.P. and Subsidiaries
Operating Partnership Ownership
Increase to OP units owned by third parties and a corresponding decrease to capital	$ 14,761us-gaap_MinorityInterestChangeInRedemptionValue / dei_LegalEntityAxis = us-gaap_SubsidiariesMember	$ 3,292us-gaap_MinorityInterestChangeInRedemptionValue / dei_LegalEntityAxis = us-gaap_SubsidiariesMember	$ 19,520us-gaap_MinorityInterestChangeInRedemptionValue / dei_LegalEntityAxis = us-gaap_SubsidiariesMember

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