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EARNINGS PER SHARE AND UNIT AND SHAREHOLDERS' EQUITY AND CAPITAL - Summary of OP and Common Units (Details) - shares
Sep. 30, 2024
Dec. 31, 2023
Sep. 30, 2023
CubeSmart, L.P. and Subsidiaries      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Outstanding units of noncontrolling interest in the Operating Partnership (in shares) 1,232,205 1,300,462 1,360,549