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Summary of Significant Accounting Policies - Additional Information (Detail)
 12 Months Ended
Dec. 31, 2024
USD ($)
Segment
Property
Trademark
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Aug. 07, 2024
$ / shares
Aug. 06, 2024
$ / shares
Nov. 01, 2023
$ / shares
Summary Of Significant Accounting Policies [Line Items]            
Payments to acquire intangible assets $ 6,500,000 $ 0 $ 10,500,000      
Business acquisition, transaction costs $ 400,000 200,000 900,000      
Number of properties severely flooded | Property 1          
Impairment losses of real property assets recognized   0 0      
Indefinite lived trademark $ 15,700,000 15,771,000        
Intangible assets, net of accumulated amortization 6,766,000 1,170,000        
Allowance for doubtful accounts 800,000 900,000        
Gross amounts of lease intangibles 86,400,000 80,700,000        
Accumulated amortization $ 79,600,000 79,500,000        
Maximum annual contributions per employee, percentage 100.00%          
Gains (losses) on exchange rate changes in equity investments recorded in other income (expense) $ (3,400,000) 200,000        
Investment, Type [Extensible Enumeration] Real Estate Investment [Member]          
Minimum percentage of ordinary taxable income to be distributed to stockholders 90.00%          
Employer matching contributions, amount $ 500,000 500,000        
Employer matching contribution, percent 100.00%          
Employer matching contribution, percent of match 4.00%          
Number of reportable business segments | Segment 2          
Rental Income | Geographic Concentration Risk | Florida            
Summary Of Significant Accounting Policies [Line Items]            
Concentration Risk Percentage1 22.00%          
Rental Income | Geographic Concentration Risk | California            
Summary Of Significant Accounting Policies [Line Items]            
Concentration Risk Percentage1 20.00%          
Rental Income | Geographic Concentration Risk | Greater Toronto Area of Canada            
Summary Of Significant Accounting Policies [Line Items]            
Concentration Risk Percentage1 10.00%          
Revolving Credit Facility            
Summary Of Significant Accounting Policies [Line Items]            
Debt issuance cost, gross $ 9,400,000 4,500,000        
Accumulated amortization of debt issuance costs 2,600,000 4,100,000        
Non Revolving Debt            
Summary Of Significant Accounting Policies [Line Items]            
Debt issuance cost, gross 6,400,000 7,700,000        
Accumulated amortization of debt issuance costs 3,000 3,400,000        
Self Storage            
Summary Of Significant Accounting Policies [Line Items]            
Total estimated future amortization expense of intangible assets, year 2025 4,300,000          
Total estimated future amortization expense of intangible assets, year 2026 1,700,000          
Total estimated future amortization expense of intangible assets, year 2027 100,000          
Total estimated future amortization expense of intangible assets, year 2028 100,000          
Total estimated future amortization expense of intangible assets, thereafter 600,000          
Intangible assets, net of accumulated amortization $ 6,800,000          
Weighted-average amortization period on remaining intangible assets 2 years 4 months 24 days          
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 $ 0 71,000        
Indefinite lived trademark $ 15,700,000 15,700,000        
Self Administration Transaction            
Summary Of Significant Accounting Policies [Line Items]            
Number of trademarks acquired | Trademark 2          
SST VI            
Summary Of Significant Accounting Policies [Line Items]            
Offering price | $ / shares       $ 10   $ 10
SST VI | Class C Common stock            
Summary Of Significant Accounting Policies [Line Items]            
Offering price | $ / shares       10    
SST VI | Common Class Y and Z shares            
Summary Of Significant Accounting Policies [Line Items]            
Offering price | $ / shares       10    
SST VI | Maximum            
Summary Of Significant Accounting Policies [Line Items]            
Offering price | $ / shares       10    
SST VI | Maximum | Class A Common stock            
Summary Of Significant Accounting Policies [Line Items]            
Offering price | $ / shares       $ 10   $ 10
SST VI OP | Class C Common stock            
Summary Of Significant Accounting Policies [Line Items]            
Share Price | $ / shares         $ 9.3  
Pacific Oak Holding Group            
Summary Of Significant Accounting Policies [Line Items]            
Variable interest entity non-voting ownership percentage 17.50%          
General and Administrative Expense            
Summary Of Significant Accounting Policies [Line Items]            
Advertising costs $ 2,300,000 2,200,000 1,300,000      
Operating Expense            
Summary Of Significant Accounting Policies [Line Items]            
Advertising costs $ 5,200,000 $ 4,800,000 $ 4,400,000