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Summary of Significant Accounting Policies - Additional Information (Detail)
 12 Months Ended
Dec. 31, 2023
USD ($)
Segment
Trademark
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Nov. 01, 2023
$ / shares
Summary Of Significant Accounting Policies [Line Items]        
Payments to acquire intangible assets $ 0 $ 10,500,000 $ 21,500,000  
Business acquisition, transaction costs 200,000 900,000 900,000  
Impairment losses of real property assets recognized 0 0 0  
Indefinite lived trademark 15,770,588 15,911,765    
Intangible assets, net of accumulated amortization 1,170,100 15,553,303    
Allowance for doubtful accounts 900,000 700,000    
Gross amounts of lease intangibles 80,700,000 88,500,000    
Accumulated amortization $ 79,500,000 $ 72,900,000    
Maximum annual contributions per employee, percentage 100.00%      
Investment, Type [Extensible Enumeration] Real Estate Investment [Member] Real Estate Investment [Member]    
Gains (losses) on exchange rate changes in equity investments recorded in other income (expense) $ 200,000 $ 9,600,000    
Employer matching contributions, amount $ 500,000 500,000    
Employer matching contribution, percent 100.00%      
Employer matching contribution, percent of match 4.00%      
Minimum percentage of ordinary taxable income to be distributed to stockholders 90.00%      
Number of reportable business segments | Segment 2      
Rental Income | Geographic Concentration Risk | Florida        
Summary Of Significant Accounting Policies [Line Items]        
Concentration Risk Percentage1 23.00%      
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%      
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    
Accumulated amortization of debt issuance costs 4,100,000 2,400,000    
Non Revolving Debt        
Summary Of Significant Accounting Policies [Line Items]        
Debt issuance cost, gross 7,700,000 7,000,000    
Accumulated amortization of debt issuance costs 3,400,000 2,500,000    
Self Storage        
Summary Of Significant Accounting Policies [Line Items]        
Total estimated future amortization expense of intangible assets, year 2024 200,000      
Total estimated future amortization expense of intangible assets, year 2025 100,000      
Total estimated future amortization expense of intangible assets, year 2026 100,000      
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 $ 1,200,000      
Weighted-average amortization period on remaining intangible assets 5 years 9 months 18 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      
SST VI        
Summary Of Significant Accounting Policies [Line Items]        
Offering price | $ / shares       $ 9.3
SST VI | Class A Common stock        
Summary Of Significant Accounting Policies [Line Items]        
Offering price | $ / shares       10
SST VI | Minimum | Class A Common stock        
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
Strategic Storage Trademark        
Summary Of Significant Accounting Policies [Line Items]        
Trademarks acquired amount $ 71,000 211,000    
Indefinite lived trademark 15,700,000 15,700,000    
Total estimated future amortization expense of intangible assets, year 2024 $ 71,000      
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 $ 4,800,000 4,400,000 3,700,000  
General and Administrative Expense        
Summary Of Significant Accounting Policies [Line Items]        
Advertising costs $ 2,200,000 $ 1,300,000 $ 700,000