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EARNINGS PER SHARE AND UNIT AND SHAREHOLDERS' EQUITY AND CAPITAL - Earnings Per Share and Unit (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2023 | Mar. 31, 2023 | Jun. 30, 2022 | Mar. 31, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | Dec. 31, 2022
Basic and diluted earnings per common share |  |  |  |  |  |  |
Net income | $ 98,283 |  | $ 58,594 |  | $ 196,225 | $ 96,860 |
Noncontrolling interests in the Operating Partnership | (616) |  | (379) |  | (1,230) | (671) |
Noncontrolling interest in subsidiaries | 212 |  | 143 |  | 450 | 324 |
NET INCOME ATTRIBUTABLE TO THE COMPANY'S COMMON SHAREHOLDERS | $ 97,879 |  | $ 58,358 |  | $ 195,445 | $ 96,513 |
Weighted average basic shares outstanding (in shares) | 225,388,000 |  | 224,960,000 |  | 225,342,000 | 224,812,000 |
Share options and restricted share units (in shares) | 887,000 |  | 935,000 |  | 896,000 | 1,008,000 |
Weighted-average diluted shares outstanding (in shares) | 226,275,000 |  | 225,895,000 |  | 226,238,000 | 225,820,000 |
Basic earnings per share attributable to common shareholders (in dollars per share) | $ 0.43 |  | $ 0.26 |  | $ 0.87 | $ 0.43 |
Diluted earnings per share attributable to common shareholders (in dollars per share) | $ 0.43 |  | $ 0.26 |  | $ 0.86 | $ 0.43 |
Basic and diluted earnings per common unit |  |  |  |  |  |  |
Noncontrolling interests in the Operating Partnership | $ (616) |  | $ (379) |  | $ (1,230) | $ (671) |
Weighted average basic shares outstanding (in shares) | 225,388,000 |  | 224,960,000 |  | 225,342,000 | 224,812,000 |
Share options and restricted share units (in shares) | 887,000 |  | 935,000 |  | 896,000 | 1,008,000 |
Weighted-average diluted shares outstanding (in shares) | 226,275,000 |  | 225,895,000 |  | 226,238,000 | 225,820,000 |
Diluted earnings per share attributable to common shareholders (in dollars per share) | $ 0.43 |  | $ 0.26 |  | $ 0.86 | $ 0.43 |
Potentially dilutive shares not included in the earnings per share calculation as their effect is antidilutive (in shares) | 700,000 |  | 300,000 |  | 700,000 | 300,000 |
Common stock, cash dividends declared (in dollars per share) | $ 0.49 | $ 0.49 | $ 0.43 | $ 0.43 | $ 0.98 | $ 0.86 |
OP units outstanding (in shares) | 1,418,549 |  | 1,460,520 |  | 1,418,549 | 1,460,520 | 1,426,549
Common shares, shares outstanding | 224,797,239 |  | 224,452,547 |  | 224,797,239 | 224,452,547 | 224,603,462
Operating Partnership [Member] |  |  |  |  |  |  |
Basic and diluted earnings per common unit |  |  |  |  |  |  |
Potentially dilutive shares not included in the earnings per share calculation as their effect is antidilutive (in shares) | 1,400,000 |  | 1,500,000 |  | 1,400,000 | 1,600,000 |
CubeSmart, L.P. and Subsidiaries |  |  |  |  |  |  |
Basic and diluted earnings per common share |  |  |  |  |  |  |
Net income |  |  |  |  | $ 196,225 | $ 96,860 |
Noncontrolling interests in the Operating Partnership | $ (616) |  | $ (379) |  | $ (1,230) | $ (671) |
Weighted average basic shares outstanding (in shares) | 225,388,000 |  | 224,960,000 |  | 225,342,000 | 224,812,000 |
Share options and restricted share units (in shares) | 887,000 |  | 935,000 |  | 896,000 | 1,008,000 |
Weighted-average diluted shares outstanding (in shares) | 226,275,000 |  | 225,895,000 |  | 226,238,000 | 225,820,000 |
Diluted earnings per share attributable to common shareholders (in dollars per share) | $ 0.43 |  | $ 0.26 |  | $ 0.86 | $ 0.43 |
Basic and diluted earnings per common unit |  |  |  |  |  |  |
Net Income | $ 98,283 |  | $ 58,594 |  | $ 196,225 | $ 96,860 |
Noncontrolling interests in the Operating Partnership | (616) |  | (379) |  | (1,230) | (671) |
Noncontrolling interest in subsidiaries | 212 |  | 143 |  | 450 | 324 |
Net income attributable to common unitholders | $ 97,879 |  | $ 58,358 |  | $ 195,445 | $ 96,513 |
Weighted average basic shares outstanding (in shares) | 225,388,000 |  | 224,960,000 |  | 225,342,000 | 224,812,000 |
Share options and restricted share units (in shares) | 887,000 |  | 935,000 |  | 896,000 | 1,008,000 |
Weighted-average diluted shares outstanding (in shares) | 226,275,000 |  | 225,895,000 |  | 226,238,000 | 225,820,000 |
Basic earnings per unit attributable to common unitholders (in dollars per share) | $ 0.43 |  | $ 0.26 |  | $ 0.87 | $ 0.43 |
Diluted earnings per share attributable to common shareholders (in dollars per share) | $ 0.43 |  | $ 0.26 |  | $ 0.86 | $ 0.43 |

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