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Summary of Significant Accounting Policies - Additional Information (Detail)
shares in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Mar. 01, 2022
Sep. 30, 2023
USD ($)
Sep. 30, 2022
USD ($)
Sep. 30, 2023
USD ($)
Trademark
Segment
Sep. 30, 2022
USD ($)
Dec. 31, 2022
USD ($)
Segment
Trademark
shares
Dec. 31, 2021
USD ($)
shares
Dec. 31, 2020
USD ($)
shares
Summary Of Significant Accounting Policies [Line Items]                
Payments to acquire intangible assets       $ 0 $ 10,500,000 $ 10,500,000 $ 21,500,000 $ 0
Business acquisition, transaction costs   $ 76,000 $ 78,000 118,000 781,000 900,000 900,000 1,400,000
Impairment losses of real property assets recognized       0 0 0 0 0
Indefinite lived trademark   15,805,882   15,805,882   15,911,765 16,052,941  
Allowance for doubtful accounts   900,000   900,000   700,000 500,000  
Gross amounts of lease intangibles   80,500,000   80,500,000   88,500,000 68,600,000  
Accumulated amortization   78,300,000   $ 78,300,000   $ 72,900,000 56,800,000  
Maximum annual contributions per employee, percentage       100.00%   100.00%    
Gains (losses) on exchange rate changes in equity investments recorded in other income (expense)   3,800,000 (8,700,000) $ 700,000 (11,100,000) $ 9,600,000 3,800,000  
Redemptions of common stock           $ 2,400,000 $ 5,600,000 $ 2,000,000
Redemptions of common stock (in shares) | shares           0.2 0.4 0.2
Employer matching contributions, amount   100,000 100,000 $ 400,000 $ 400,000 $ 500,000 $ 200,000  
Employer matching contribution, percent       100.00%   100.00%    
Employer matching contribution, percent of match         4.00% 4.00%    
Minimum percentage of ordinary taxable income to be distributed to stockholders       90.00%   90.00%    
Number of reportable business segments | Segment       2   2    
Finite-Lived Intangible Assets, Net, Total   $ 2,214,891   $ 2,214,891   $ 15,553,303 $ 14,337,820  
Investment, Type [Extensible Enumeration]   Real Estate Investment [Member]   Real Estate Investment [Member]   Real Estate Investment [Member]    
Rental Income | Geographic Concentration Risk | Florida                
Summary Of Significant Accounting Policies [Line Items]                
Concentration Risk Percentage1       22.80%   23.00%    
Rental Income | Geographic Concentration Risk | California                
Summary Of Significant Accounting Policies [Line Items]                
Concentration Risk Percentage1       20.00%   20.10%    
Rental Income | Geographic Concentration Risk | Greater Toronto Area of Canada                
Summary Of Significant Accounting Policies [Line Items]                
Concentration Risk Percentage1       10.30%   9.80%    
Class T Common stock                
Summary Of Significant Accounting Policies [Line Items]                
Monthly stockholder servicing fee accrual description       accrued daily in an amount equal to 1/365th of 1% of the purchase price per share   accrued daily in an amount equal to 1/365th of 1% of the purchase price per share accrues daily in an amount equal to 1/365th of 1% of the purchase price per share  
Redeemable Common Stock                
Summary Of Significant Accounting Policies [Line Items]                
Redemptions of common stock             $ 1,700,000 $ 700,000
Redeemable Common Stock | Share Redemption Program                
Summary Of Significant Accounting Policies [Line Items]                
Redemptions of common stock             3,900,000 $ 1,300,000
Revolving Credit Facility                
Summary Of Significant Accounting Policies [Line Items]                
Debt issuance cost, gross   $ 4,500,000   $ 4,500,000   $ 4,500,000 4,100,000  
Accumulated amortization of debt issuance costs   3,700,000   3,700,000   2,400,000 800,000  
Non Revolving Debt                
Summary Of Significant Accounting Policies [Line Items]                
Debt issuance cost, gross   6,800,000   6,800,000   7,000,000 5,800,000  
Accumulated amortization of debt issuance costs   3,100,000   3,100,000   2,500,000 1,900,000  
Self Storage                
Summary Of Significant Accounting Policies [Line Items]                
Total estimated future amortization expense of intangible assets, year 2023   1,100,000   1,100,000   6,400,000    
Total estimated future amortization expense of intangible assets, year 2024   100,000   100,000   100,000    
Total estimated future amortization expense of intangible assets, year 2025   100,000   100,000   100,000    
Total estimated future amortization expense of intangible assets, year 2026   100,000   100,000   100,000    
Total estimated future amortization expense of intangible assets, thereafter           $ 800,000    
Total estimated future amortization expense of intangible assets, year 2027   100,000   100,000        
Total estimated future amortization expense of intangible assets, thereafter   700,000   700,000        
Finite-Lived Intangible Assets, Net, Total   2,100,000   $ 2,100,000        
Weighted-average amortization period on remaining intangible assets       3 years 2 months 12 days        
Minimum                
Summary Of Significant Accounting Policies [Line Items]                
Estimated useful life       3 years   3 years    
Maximum                
Summary Of Significant Accounting Policies [Line Items]                
Estimated useful life       5 years   5 years    
Strategic Storage Trademark                
Summary Of Significant Accounting Policies [Line Items]                
Trademarks acquired amount   105,000   $ 105,000   $ 211,000 400,000  
Indefinite lived trademark   15,700,000   15,700,000   15,700,000 15,700,000  
Total estimated future amortization expense of intangible assets, year 2023   35,000   35,000   140,000    
Total estimated future amortization expense of intangible assets, year 2024   70,000   70,000   70,000    
Finite Lived Intangible Assets Amortization Expense After Year Two   0   $ 0   $ 0    
Self Administration Transaction                
Summary Of Significant Accounting Policies [Line Items]                
Number of trademarks acquired | Trademark       2   2    
Total estimated future amortization expense of intangible assets, year 2023           $ 55,000    
Total estimated future amortization expense of intangible assets, year 2024           55,000    
Total estimated future amortization expense of intangible assets, year 2025           0    
Gross amounts of lease intangibles           9,900,000 6,800,000  
Accumulated amortization           1,800,000 4,300,000  
Pacific Oak Holding Group                
Summary Of Significant Accounting Policies [Line Items]                
Variable interest entity non-voting ownership percentage 10.00%              
Operating Expense                
Summary Of Significant Accounting Policies [Line Items]                
Advertising costs   1,200,000 1,200,000 $ 3,600,000 $ 3,300,000 4,400,000 3,700,000  
General and Administrative Expense                
Summary Of Significant Accounting Policies [Line Items]                
Advertising costs   $ 500,000 $ 400,000 $ 1,600,000 $ 800,000 $ 1,300,000 $ 700,000