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ACQUISITIONS AND DISPOSITIONS - Additional Information (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Apr. 30, 2025
USD ($)
jointVenture
property
joint_venture
Mar. 31, 2025
property
Sep. 30, 2025
USD ($)
Jun. 30, 2025
USD ($)
Mar. 31, 2025
USD ($)
property
Sep. 30, 2024
USD ($)
Jun. 30, 2024
USD ($)
Mar. 31, 2024
USD ($)
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Asset Acquisition [Line Items]                    
Assumed debt | $     $ 0 $ 258,000 $ 0 $ 0 $ 0 $ 0 $ 258,000 $ 0
Number of joint ventures | joint_venture 2                  
ESS-NYFL JV LP and ESS-CA TIVS JV LP                    
Asset Acquisition [Line Items]                    
Value of real estate asset acquired | $ $ 436,797                  
Assumed debt | $ $ 258,000                  
Equity Ownership % 100.00%                  
Number of properties acquired 27                  
Number of joint ventures | jointVenture 2                  
PR II EXR JV LLC                    
Asset Acquisition [Line Items]                    
Equity Ownership %   25.00% 25.00%   25.00%       25.00%  
Number of properties acquired   6     6          
Number of properties exchanged   17     17          
Number of properties in portfolio   23     23          
Ownership percentage after transaction   100.00%                
PR II EXR JV LLC | Partner                    
Asset Acquisition [Line Items]                    
Number of properties acquired   17     17          
Number of properties exchanged   6     6          
Equity ownership percentage exchanged   75.00%     75.00%