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Summary of Significant Accounting Policies - Additional Information (Detail) |  | 3 Months Ended | 6 Months Ended |
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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 |

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