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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 | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Sep. 30, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022
Basic and diluted earnings per common share |  |  |  |  |  |  |  |  |
Net income | $ 103,073 |  |  | $ 113,440 |  |  | $ 299,298 | $ 210,300 |
Noncontrolling interests in the Operating Partnership | (640) |  |  | (733) |  |  | (1,870) | (1,404) |
Noncontrolling interest in subsidiaries | 212 |  |  | 181 |  |  | 662 | 505 |
NET INCOME ATTRIBUTABLE TO THE COMPANY'S COMMON SHAREHOLDERS | $ 102,645 |  |  | $ 112,888 |  |  | $ 298,090 | $ 209,401 |
Weighted average basic shares outstanding (in shares) | 225,467,000 |  |  | 225,023,000 |  |  | 225,380,000 | 224,883,000 |
Share options and restricted share units (in shares) | 743,000 |  |  | 943,000 |  |  | 826,000 | 998,000 |
Weighted-average diluted shares outstanding (in shares) | 226,210,000 |  |  | 225,966,000 |  |  | 226,206,000 | 225,881,000 |
Basic earnings per share attributable to common shareholders (in dollars per share) | $ 0.46 |  |  | $ 0.50 |  |  | $ 1.32 | $ 0.93 |
Diluted earnings per share attributable to common shareholders (in dollars per share) | $ 0.45 |  |  | $ 0.50 |  |  | $ 1.32 | $ 0.93 |
Basic and diluted earnings per common unit |  |  |  |  |  |  |  |  |
Noncontrolling interests in the Operating Partnership | $ (640) |  |  | $ (733) |  |  | $ (1,870) | $ (1,404) |
Weighted average basic shares outstanding (in shares) | 225,467,000 |  |  | 225,023,000 |  |  | 225,380,000 | 224,883,000 |
Share options and restricted share units (in shares) | 743,000 |  |  | 943,000 |  |  | 826,000 | 998,000 |
Weighted-average diluted shares outstanding (in shares) | 226,210,000 |  |  | 225,966,000 |  |  | 226,206,000 | 225,881,000 |
Diluted earnings per share attributable to common shareholders (in dollars per share) | $ 0.45 |  |  | $ 0.50 |  |  | $ 1.32 | $ 0.93 |
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 | $ 0.49 | $ 0.43 | $ 0.43 | $ 0.43 | $ 1.47 | $ 1.29 |
OP units outstanding (in shares) | 1,360,549 |  |  | 1,460,520 |  |  | 1,360,549 | 1,460,520 | 1,426,549
Common shares, shares outstanding | 224,859,021 |  |  | 224,568,376 |  |  | 224,859,021 | 224,568,376 | 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 | 1,500,000 |
CubeSmart, L.P. and Subsidiaries |  |  |  |  |  |  |  |  |
Basic and diluted earnings per common share |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  | $ 299,298 | $ 210,300 |
Noncontrolling interests in the Operating Partnership | $ (640) |  |  | $ (733) |  |  | $ (1,870) | $ (1,404) |
Weighted average basic shares outstanding (in shares) | 225,467,000 |  |  | 225,023,000 |  |  | 225,380,000 | 224,883,000 |
Share options and restricted share units (in shares) | 743,000 |  |  | 943,000 |  |  | 826,000 | 998,000 |
Weighted-average diluted shares outstanding (in shares) | 226,210,000 |  |  | 225,966,000 |  |  | 226,206,000 | 225,881,000 |
Diluted earnings per share attributable to common shareholders (in dollars per share) | $ 0.45 |  |  | $ 0.50 |  |  | $ 1.32 | $ 0.93 |
Basic and diluted earnings per common unit |  |  |  |  |  |  |  |  |
Net Income | $ 103,073 |  |  | $ 113,440 |  |  | $ 299,298 | $ 210,300 |
Noncontrolling interests in the Operating Partnership | (640) |  |  | (733) |  |  | (1,870) | (1,404) |
Noncontrolling interest in subsidiaries | 212 |  |  | 181 |  |  | 662 | 505 |
Net income attributable to common unitholders | $ 102,645 |  |  | $ 112,888 |  |  | $ 298,090 | $ 209,401 |
Weighted average basic shares outstanding (in shares) | 225,467,000 |  |  | 225,023,000 |  |  | 225,380,000 | 224,883,000 |
Share options and restricted share units (in shares) | 743,000 |  |  | 943,000 |  |  | 826,000 | 998,000 |
Weighted-average diluted shares outstanding (in shares) | 226,210,000 |  |  | 225,966,000 |  |  | 226,206,000 | 225,881,000 |
Basic earnings per unit attributable to common unitholders (in dollars per share) | $ 0.46 |  |  | $ 0.50 |  |  | $ 1.32 | $ 0.93 |
Diluted earnings per share attributable to common shareholders (in dollars per share) | $ 0.45 |  |  | $ 0.50 |  |  | $ 1.32 | $ 0.93 |

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