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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Reclassifications (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Cash paid upon vesting of restricted shares $ (2,001) $ (1,599)
Accounting Standards Update 2016-09 | Reclassifications    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Cash paid upon vesting of restricted shares   1,600
CubeSmart, L.P. and Subsidiaries    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Cash paid upon vesting of restricted shares $ (2,001) $ (1,599)