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Related Party Transactions - Summary of Related Party Carrying Value of Investments In Advances (Parenthetical) (Detail) - USD ($) |  | 3 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
May 02, 2023 | Mar. 31, 2023 | Mar. 31, 2022 | May 31, 2023 | Dec. 31, 2022 | Oct. 07, 2021
Related Party Transaction [Line Items] |  |  |  |  |  |
Principal borrowing amount |  |  |  |  |  | $ 700,000,000
Outstanding principal, plus accrued interest |  | $ 12,016,875 | $ 0 |  |  |
SST VI | Subsequent Event |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Outstanding principal, plus accrued interest | $ 51,700,000 |  |  |  |  |
Series A Cumulative Preferred Stock | Subsequent Event |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Preferred stock shares redeemed |  |  |  | 600,000 |  |
Series A Cumulative Preferred Stock | SST VI OP | Subsequent Event |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Preferred stock shares redeemed | 600,000 |  |  |  |  |
Interest payable | $ 15,100,000 |  |  |  |  |
SSGT III Mezzanine Loan |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Principal borrowing amount |  | 17,500,000 |  |  | $ 17,500,000 |
SST VI Mezzanine Loan |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Principal borrowing amount |  | $ 5,000,000.0 |  |  | $ 20,000,000.0 |

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