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EARNINGS PER SHARE AND UNIT AND SHAREHOLDERS' EQUITY AND CAPITAL - Earnings Per Share and Unit (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Basic and diluted earnings per common share |  |  |
Net income | $ 412,435 | $ 292,472 | $ 230,813
Net income attributable to noncontrolling interests in the Operating Partnership | (2,535) | (1,931) | (7,873)
Net loss attributable to noncontrolling interests in subsidiaries | 857 | 722 | 542
NET INCOME ATTRIBUTABLE TO THE COMPANY'S COMMON SHAREHOLDERS | $ 410,757 | $ 291,263 | $ 223,482
Weighted average basic shares outstanding (in shares) | 225,424 | 224,928 | 203,832
Share options and restricted share units (in shares) | 817 | 953 | 1,177
Weighted-average diluted shares outstanding (in shares) | 226,241 | 225,881 | 205,009
Basic earnings per share attributable to common shareholders (in dollars per share) | $ 1.82 | $ 1.29 | $ 1.10
Diluted earnings per share attributable to common shareholders (in dollars per share) | $ 1.82 | $ 1.29 | $ 1.09
Basic and diluted earnings per common unit |  |  |
Weighted average basic shares outstanding (in shares) | 225,424 | 224,928 | 203,832
Share options and restricted share units (in shares) | 817 | 953 | 1,177
Weighted-average diluted shares outstanding (in shares) | 226,241 | 225,881 | 205,009
Diluted earnings per share attributable to common shareholders (in dollars per share) | $ 1.82 | $ 1.29 | $ 1.09
Potentially dilutive shares not included in the earnings per share calculation as their effect is antidilutive (in shares) | 700 | 300 | 0
Common stock, cash dividends declared (in dollars per share) | $ 1.98 | $ 1.78 | $ 1.45
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 | 1,500 | 7,100
CubeSmart, L.P. and Subsidiaries |  |  |
Basic and diluted earnings per common share |  |  |
Net income | $ 412,435 | $ 292,472 | $ 230,813
Weighted average basic shares outstanding (in shares) | 226,817 | 226,449 | 210,949
Share options and restricted share units (in shares) | 817 | 953 | 1,177
Weighted-average diluted shares outstanding (in shares) | 227,634 | 227,402 | 212,126
Diluted earnings per share attributable to common shareholders (in dollars per share) | $ 1.82 | $ 1.29 | $ 1.09
Basic and diluted earnings per common unit |  |  |
Net Income | $ 412,435 | $ 292,472 | $ 230,813
Net loss attributable to noncontrolling interest in subsidiaries | 857 | 722 | 542
Net income attributable to CubeSmart L.P. | $ 413,292 | $ 293,194 | $ 231,355
Weighted average basic shares outstanding (in shares) | 226,817 | 226,449 | 210,949
Share options and restricted share units (in shares) | 817 | 953 | 1,177
Weighted-average diluted shares outstanding (in shares) | 227,634 | 227,402 | 212,126
Basic earnings per unit attributable to common unitholders (in dollars per share) | $ 1.82 | $ 1.29 | $ 1.10
Diluted earnings per share attributable to common shareholders (in dollars per share) | $ 1.82 | $ 1.29 | $ 1.09

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