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Real Estate Facilities - Summary of Reconciles Total Consideration Transferred (Parenthetical) (Detail) - USD ($)
 12 Months Ended
Jun. 01, 2022
Nov. 10, 2020
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Mar. 17, 2021
Business Acquisition [Line Items]            
Debt Instrument Carrying Amount     $ 1,072,958,927      
Business acquisition, transaction costs     $ 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 $ 100,000        
Strategic Storage Trust IV, Inc.            
Business Acquisition [Line Items]            
Cash consideration [1]   54,250,000        
Debt Instrument Carrying Amount   54,000,000.0        
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          
[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] (1) 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.