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NONCONTROLLING INTERESTS - Operating Partnership Ownership (Details) $ in Thousands |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Sep. 29, 2020 USD ($) shares | Jul. 20, 2020 USD ($) | Dec. 31, 2020 USD ($) item shares | Jun. 30, 2021 USD ($) shares | Mar. 31, 2021 USD ($) | Jun. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2020 USD ($) shares
Operating Partnership Ownership |  |  |  |  |  |  |  |
OP Units outstanding which are not owned by the general partner (as a percent) |  |  | 3.60% | 3.50% |  |  |  | 3.60%
OP units outstanding (in shares) | shares |  |  | 7,420,828 | 7,284,506 |  |  |  | 7,420,828
Adjustment for noncontrolling interest in the Operating Partnership |  |  |  | $ (63,025) | $ (32,102) | $ (615) | $ 7,976 | $ (4,200)
New York |  |  |  |  |  |  |  |
Operating Partnership Ownership |  |  |  |  |  |  |  |
Purchase Price |  | $ 9,500 |  |  |  |  |  |
Total consideration | $ 10,000 |  |  |  |  |  |  |
Cash paid for acquisition | $ 1,000 |  |  |  |  |  |  |
Units issued (in shares) | shares | 276,497 |  |  |  |  |  |  |
Units issued | $ 9,000 |  |  |  |  |  |  |
Storage Deluxe assets |  |  |  |  |  |  |  |
Operating Partnership Ownership |  |  |  |  |  |  |  |
Purchase Price |  |  | $ 540,000 |  |  |  |  |
Number of tranches | item |  |  | 2 |  |  |  |  |
Units issued (in shares) | shares |  |  | 5,272,023 |  |  |  |  |
Units issued |  |  | $ 175,100 |  |  |  |  |
Cubesmart, L P and Subsidiaries |  |  |  |  |  |  |  |
Operating Partnership Ownership |  |  |  |  |  |  |  |
Adjustment for noncontrolling interest in the Operating Partnership |  |  |  | $ (63,025) | $ (32,102) | $ (615) | $ 7,976 |

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