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Real Estate Facilities - Summary of Reconciles Total Consideration Transferred (Parenthetical) (Detail) - USD ($) |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Jun. 01, 2022 | Nov. 10, 2020 | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Mar. 17, 2021
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cash consideration | [1] |  | $ 54,250,000 |  |  |  |  |  |  |  |
Debt Instrument Carrying Amount |  |  |  | $ 1,059,001,412 |  | $ 1,059,001,412 |  | $ 1,072,958,927 |  |  |
Business acquisition, transaction costs |  |  |  | $ 75,933 | $ 77,813 | $ 118,229 | $ 780,684 | $ 888,009 | $ 934,838 | $ 1,366,092 |
KeyBank SST IV CMBS Loan |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument Carrying Amount |  |  |  |  |  |  |  |  |  |  | $ 40,500,000
Fair market value discount on debt |  | $ 16,100,000 | 0.1 |  |  |  |  |  |  |  |
Strategic Storage Trust IV, Inc. |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cash consideration |  |  | 54,300,000 |  |  |  |  |  |  |  |
Debt Instrument Carrying Amount |  |  | 54,000,000 |  |  |  |  |  |  |  |
Business acquisition, transaction costs |  |  | $ 300,000 |  |  |  |  |  |  |  |
SSGT II Merger Agreement |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cash consideration | [2] | 76,300,006 |  |  |  |  |  |  |  |  |
Debt Instrument Carrying Amount |  | 75,100,000 |  |  |  |  |  |  |  |  |
Business acquisition, transaction costs |  | 1,200,000 |  |  |  |  |  |  |  |  |
Fair market value discount on debt |  | $ 16,100,000 |  |  |  |  |  |  |  |  |
[1] | The approximately $54.3 million in cash was primarily used to pay off approximately $54.0 million of SST IV debt that we did not assume in the SST IV Merger, as well as approximately $0.3 million in transaction costs.
[2] | The approximately $76.3 million in cash was primarily used to pay off approximately $75.1 million of SSGT II’s debt that we did not assume in the SSGT II Merger, as well as approximately $1.2 million in transaction costs.

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