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Investments - Summary of Amortized Cost and Fair Value of Investments in Fixed Maturity Securities, Classified as Available-for-Sale (Detail) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Schedule Of Available For Sale Securities [Line Items] |  |
Within one year, Amortized Cost | $ 29,845 | $ 28,290
After one year through five years, Amortized Cost | 105,650 | 68,876
After five years through ten years, Amortized Cost | 83,150 | 102,296
After ten years, Amortized Cost | 107,777 | 133,147
Available-for-sale, Amortized Cost | 331,798 | 338,593
Within one year, Fair Value | 29,610 | 27,814
After one year through five years, Fair Value | 98,566 | 65,406
After five years through ten years, Fair Value | 75,968 | 95,366
After ten years, Fair Value | 97,232 | 127,089
Available-for-sale, Fair Value | 306,040 | 321,121
U.S. Agency-Based Mortgage-Backed Securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Without single maturity date, Amortized Cost | 5,376 | 5,984
Without single maturity date, Fair value | $ 4,664 | $ 5,446

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