NONCONTROLLING INTERESTS - Operating Partnership Ownership (Details) - USD ($) $ in Thousands |
9 Months Ended | 12 Months Ended | |||
|---|---|---|---|---|---|
Apr. 18, 2016 |
May 14, 2015 |
Sep. 30, 2017 |
Sep. 30, 2016 |
Dec. 31, 2016 |
|
| Operating Partnership Ownership | |||||
| OP Units outstanding which are not owned by the general partner (as a percent) | 1.00% | 1.10% | |||
| OP units issued (in shares) | 61,224 | 20,408 | |||
| Issuance of OP Shares | $ 1,500 | $ 500 | |||
| Adjustment for noncontrolling interest in the Operating Partnership | $ 1,756 | $ 6,404 | $ 7,400 | ||
| CubeSmart, L.P. and Subsidiaries | |||||
| Operating Partnership Ownership | |||||
| 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 | $ 1,756 | $ 6,404 | |||