v3.25.4
Summary of Significant Accounting Policies - Additional Information (Detail)
 12 Months Ended
Dec. 31, 2025
USD ($)
Segment
Trademark
Dec. 31, 2024
USD ($)
Property
Dec. 31, 2023
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 $ 13,700,000 $ 6,500,000 $ 0      
Asset acquisition-related transaction costs 1,000,000 $ 400,000 200,000      
Acquisition costs 1,000,000          
Number of properties severely flooded | Property   1        
Impairment losses of real property assets recognized 0   0      
Indefinite lived trademark 15,700,000 $ 15,700,000        
Intangible assets, net of accumulated amortization 18,358,000 6,766,000        
Allowance for doubtful accounts 700,000 800,000        
Gross amounts of lease intangibles 100,100,000 86,400,000        
Accumulated amortization $ 89,400,000 79,600,000        
Maximum annual contributions per employee, percentage 100.00%          
Gains (losses) on exchange rate changes in equity investments recorded in other income (expense) $ 2,700,000 $ (3,400,000) $ 200,000      
Investment, Type [Extensible Enumeration] us-gaap:RealEstateInvestmentMember us-gaap:RealEstateInvestmentMember us-gaap:RealEstateInvestmentMember      
Minimum percentage of ordinary taxable income to be distributed to stockholders 90.00%          
Derivative instruments held 0          
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 20.20%          
Rental Income | Geographic Concentration Risk | California            
Summary Of Significant Accounting Policies [Line Items]            
Concentration Risk Percentage1 20.90%          
Rental Income | Geographic Concentration Risk | Greater Toronto Area of Canada            
Summary Of Significant Accounting Policies [Line Items]            
Concentration Risk Percentage1 9.10%          
Revolving Credit Facility            
Summary Of Significant Accounting Policies [Line Items]            
Debt issuance cost, gross $ 8,300,000 $ 9,400,000        
Accumulated amortization of debt issuance costs 4,900,000 2,600,000        
Non Revolving Debt            
Summary Of Significant Accounting Policies [Line Items]            
Debt issuance cost, gross 7,700,000 6,400,000        
Accumulated amortization of debt issuance costs 3,300,000 3,000,000        
Self Storage            
Summary Of Significant Accounting Policies [Line Items]            
Total estimated future amortization expense of intangible assets, year 2026 9,400,000          
Total estimated future amortization expense of intangible assets, year 2027 600,000          
Total estimated future amortization expense of intangible assets, year 2028 100,000          
Total estimated future amortization expense of intangible assets, year 2029 100,000          
Total estimated future amortization expense of intangible assets, thereafter 500,000          
Intangible assets, net of accumulated amortization $ 10,700,000          
Weighted-average amortization period on remaining intangible assets 10 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]            
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          
Third Party Platform            
Summary Of Significant Accounting Policies [Line Items]            
Acquisition costs $ 1,000,000          
Total estimated future amortization expense of intangible assets, year 2026 1,200,000          
Total estimated future amortization expense of intangible assets, year 2027 1,200,000          
Total estimated future amortization expense of intangible assets, year 2028 1,200,000          
Total estimated future amortization expense of intangible assets, year 2029 1,200,000          
Total estimated future amortization expense of intangible assets, thereafter 2,800,000          
Intangible assets, net of accumulated amortization $ 7,700,000          
Weighted-average amortization period on remaining intangible assets 6 years 3 months          
Gross amounts of lease intangibles $ 8,000,000          
Accumulated amortization $ 300,000          
Argus Professional Storage Management LLC            
Summary Of Significant Accounting Policies [Line Items]            
Maximum annual contributions per employee, percentage 100.00%          
Employer matching contribution, percent 100.00%          
Employer matching contribution, percent of match 3.00%          
SST VI            
Summary Of Significant Accounting Policies [Line Items]            
Offering price | $ / shares       $ 10   $ 9.3
SST VI | Class A Common stock            
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 | 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  
General and Administrative Expense            
Summary Of Significant Accounting Policies [Line Items]            
Advertising costs $ 2,000,000 2,300,000 $ 2,200,000      
Operating Expense            
Summary Of Significant Accounting Policies [Line Items]            
Advertising costs $ 5,800,000 $ 5,200,000 $ 4,800,000