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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Operating Partnership, Purchase Allocation, Depreciation and Amortization (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Operating Partnership Ownership      
Increase (decrease) to OP units owned by third parties and a corresponding decrease to capital $ 3,965 $ (7,388) $ 19,619
Purchase Price Allocation      
Amount of purchase price allocated to above- or below-market lease intangibles $ 0    
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 (decrease) to OP units owned by third parties and a corresponding decrease to capital $ 3,965 $ (7,388) $ (19,619)