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Real Estate Facilities - Summary of Reconciles Total Consideration Transferred (Parenthetical) (Detail) - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended
Jun. 01, 2022
Nov. 10, 2020
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Mar. 17, 2021
Business Acquisition [Line Items]                    
Cash consideration [1]   $ 54,250,000                
Debt Instrument Carrying Amount     $ 1,059,001,412   $ 1,059,001,412   $ 1,072,958,927      
Business acquisition, transaction costs     $ 75,933 $ 77,813 $ 118,229 $ 780,684 $ 888,009 $ 934,838 $ 1,366,092  
KeyBank SST IV CMBS Loan                    
Business Acquisition [Line Items]                    
Debt Instrument Carrying Amount                   $ 40,500,000
Fair market value discount on debt $ 16,100,000 0.1                
Strategic Storage Trust IV, Inc.                    
Business Acquisition [Line Items]                    
Cash consideration   54,300,000                
Debt Instrument Carrying Amount   54,000,000                
Business acquisition, transaction costs   $ 300,000                
SSGT II Merger Agreement                    
Business Acquisition [Line Items]                    
Cash consideration [2] 76,300,006                  
Debt Instrument Carrying Amount 75,100,000                  
Business acquisition, transaction costs 1,200,000                  
Fair market value discount on debt $ 16,100,000                  
[1] The approximately $54.3 million in cash was primarily used to pay off approximately $54.0 million of SST IV debt that we did not assume in the SST IV Merger, as well as approximately $0.3 million in transaction costs.
[2] The approximately $76.3 million in cash was primarily used to pay off approximately $75.1 million of SSGT II’s debt that we did not assume in the SSGT II Merger, as well as approximately $1.2 million in transaction costs.