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Related Party Transactions - Summary of Related Party Carrying Value of Investments In Advances (Parenthetical) (Detail) - USD ($) $ in Millions | Dec. 31, 2023 | Jun. 13, 2023 | Oct. 07, 2021
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Related Party Transaction [Line Items] |  |  |
Principal borrowing amount |  |  | $ 700.0
SST VI |  |  |
Related Party Transaction [Line Items] |  |  |
Principal borrowing amount |  | $ 15.0 |
SSGT III Mezzanine Loan |  |  |
Related Party Transaction [Line Items] |  |  |
Principal borrowing amount | $ 1.5 |  |

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