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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Operating Partnership, Purchase Allocation, Depreciation and Amortization (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Operating Partnership Ownership      
Increase (decrease) to OP units owned by third parties and a corresponding decrease to capital $ 8,084 $ (27,203) $ 164,109
Purchase Price Allocation      
Amount of purchase price allocated to above- or below-market lease intangibles assumed at acquisition 0    
Depreciation and Amortization      
Write-off of fully depreciated real estate assets 29,100 32,300  
Write-off of fully amortized in-place lease intangible assets 3,400 121,600  
Impairment losses $ 0 0 0
Minimum      
Depreciation and Amortization      
Useful lives of self-storage facilities and improvements 5 years    
Maximum      
Depreciation and Amortization      
Useful lives of self-storage facilities and improvements 39 years    
CubeSmart, L.P. and Subsidiaries      
Operating Partnership Ownership      
Increase (decrease) to OP units owned by third parties and a corresponding decrease to capital $ 8,084 $ (27,203) $ 164,109