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Summary of Significant Accounting Policies - Additional Information (Detail)
 3 Months Ended 6 Months Ended
Mar. 01, 2022
Jun. 30, 2023
USD ($)
Jun. 30, 2022
USD ($)
Jun. 30, 2023
USD ($)
Segment
Trademark
Jun. 30, 2022
USD ($)
Dec. 31, 2022
USD ($)
Summary Of Significant Accounting Policies [Line Items]            
Payments to acquire intangible assets       $ 0 $ 10,500,000  
Business acquisition, transaction costs   $ 11,000,000,000 $ 285,000,000,000 42,000,000,000 703,000,000,000  
Impairment losses of real property assets recognized       0 $ 0  
Indefinite lived trademark   15,841,176   15,841,176   $ 15,911,765
Allowance for doubtful accounts   900,000   900,000   700,000
Gross amounts of lease intangibles   88,600,000   88,600,000   88,500,000
Accumulated amortization   76,700,000   $ 76,700,000   72,900,000
Maximum annual contributions per employee, percentage       100.00%    
Minimum percentage of ordinary taxable income to be distributed to stockholders       90.00%    
Employer matching contribution, percent       100.00%    
Employer matching contribution, percent of match         4.00%  
Employer matching contributions, amount   100,000 100,000 $ 300,000 $ 200,000  
Number of reportable business segments | Segment       2    
Rental Income | Geographic Concentration Risk | Florida            
Summary Of Significant Accounting Policies [Line Items]            
Concentration Risk Percentage1       22.90%    
Rental Income | Geographic Concentration Risk | California            
Summary Of Significant Accounting Policies [Line Items]            
Concentration Risk Percentage1       20.10%    
Rental Income | Geographic Concentration Risk | Greater Toronto Area of Canada            
Summary Of Significant Accounting Policies [Line Items]            
Concentration Risk Percentage1       10.30%    
Real Estate Investment            
Summary Of Significant Accounting Policies [Line Items]            
Gains (losses) on exchange rate changes in equity investments recorded in other income (expense)   3,100,000 (4,400,000) $ 3,100,000 (2,400,000)  
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    
Revolving Credit Facility            
Summary Of Significant Accounting Policies [Line Items]            
Debt issuance cost, gross   4,500,000   $ 4,500,000   4,500,000
Accumulated amortization of debt issuance costs   3,300,000   3,300,000   2,400,000
Non Revolving Debt            
Summary Of Significant Accounting Policies [Line Items]            
Debt issuance cost, gross   6,800,000   6,800,000   7,000,000.0
Accumulated amortization of debt issuance costs   2,900,000   2,900,000   2,500,000
Self Storage            
Summary Of Significant Accounting Policies [Line Items]            
Total estimated future amortization expense of intangible assets, year 2023   2,800,000   2,800,000    
Total estimated future amortization expense of intangible assets, year 2024   200,000   200,000    
Total estimated future amortization expense of intangible assets, year 2025   100,000   100,000    
Total estimated future amortization expense of intangible assets, year 2026   100,000   100,000    
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    
Minimum            
Summary Of Significant Accounting Policies [Line Items]            
Estimated useful life       3 years    
Maximum            
Summary Of Significant Accounting Policies [Line Items]            
Estimated useful life       5 years    
Strategic Storage Trademark            
Summary Of Significant Accounting Policies [Line Items]            
Trademarks acquired amount   141,000,000,000   $ 141,000,000,000   1,000,000,000
Indefinite lived trademark   15,700,000   15,700,000   $ 15,700,000
Total estimated future amortization expense of intangible assets, year 2023   71,000   71,000    
Total estimated future amortization expense of intangible assets, year 2024   70,000   70,000    
Finite Lived Intangible Assets Amortization Expense After Year Two   0   $ 0    
Self Administration Transaction            
Summary Of Significant Accounting Policies [Line Items]            
Number of trademarks acquired | Trademark       2    
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   1,300,000 1,100,000 $ 2,500,000 2,100,000  
General and Administrative Expense            
Summary Of Significant Accounting Policies [Line Items]            
Advertising costs   $ 600,000 $ 300,000 $ 1,100,000 $ 400,000