NONCONTROLLING INTERESTS - Operating Partnership Ownership (Details) - USD ($) $ in Thousands			6 Months Ended		12 Months Ended
	Apr. 18, 2016	May 14, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Operating Partnership Ownership
OP Units outstanding which are not owned by the general partner (as a percent)			1.20%		1.20%
OP units issued (in shares)	61,224	20,408
Issuance of OP Units	$ 1,500	$ 500
Increase to OP units owned by third parties and a corresponding decrease to capital			$ 1,469	$ 2,913
CubeSmart, L.P. and Subsidiaries
Operating Partnership Ownership
OP units outstanding (in shares)			2,220,874		2,159,650
Number of trading days used to determine average of the closing prices of the common shares			10 days
Increase to OP units owned by third parties and a corresponding decrease to capital			$ 1,469	$ 2,913	$ 19,600