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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