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NONCONTROLLING INTERESTS - Operating Partnership Ownership (Details) - USD ($)
$ in Thousands
 12 Months Ended
May 09, 2017
Apr. 12, 2017
Apr. 18, 2016
May 14, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Operating Partnership Ownership              
OP units issued (in shares)     61,224 20,408      
Issuance of OP Shares     $ 1,500 $ 500      
Adjustment for noncontrolling interest in the Operating Partnership         $ (3,965) $ 7,388 $ (19,619)
Illinois              
Operating Partnership Ownership              
Total consideration   $ 11,200          
Cash paid for acquisition   $ 9,700     $ 9,700    
Units issued (in shares)   58,400          
Maryland              
Operating Partnership Ownership              
Total consideration $ 18,200            
Amount of mortgage loan commitment $ 5,900            
Units issued (in shares) 440,160            
Units issued $ 12,300            
CubeSmart, L.P. and Subsidiaries              
Operating Partnership Ownership              
OP Units outstanding which are not owned by the general partner (as a percent)         1.00% 1.10%  
Issuance of OP Shares           $ 4,876  
OP units outstanding (in shares)         1,878,253 2,032,394  
Number of trading days used to determine average of the closing prices of the shares         10 days    
Adjustment for noncontrolling interest in the Operating Partnership         $ (3,965) $ 7,388 $ 19,619