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Summary of Significant Accounting Policies - Additional Information (Detail) | 12 Months Ended |  |  |
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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 |  |  |

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