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NONCONTROLLING INTERESTS (Details 2) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
May. 14, 2015
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Operating Partnership Ownership        
OP units issued (in shares) 20,408      
Issuance of OP Units $ 500      
Additional consideration to be paid upon the completion of certain milestones within a specified period from closing $ 1,500      
Acrrued liability relating to the additional consideration to be paid in the acquisition of real property   $ 200    
Increase to OP units owned by third parties and a corresponding decrease to capital   $ 2,913 $ 5,830 $ 14,800
CubeSmart, L.P. and Subsidiaries        
Operating Partnership Ownership        
OP Units outstanding which are not owned by the general partner (as a percent)   1.30%   1.40%
Number of trading days used to determine average of the closing prices of the common shares   10 days    
OP units outstanding (in shares)   2,265,650   2,257,486
Increase to OP units owned by third parties and a corresponding decrease to capital   $ 2,913 $ 5,830