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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

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