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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 | Dec. 31, 2022 | Dec. 31, 2021
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Schedule Of Available For Sale Securities [Line Items] |  |
Within one year, Amortized Cost | $ 28,290 | $ 30,925
After one year through five years, Amortized Cost | 68,876 | 97,830
After five years through ten years, Amortized Cost | 102,296 | 58,050
After ten years, Amortized Cost | 133,147 | 129,848
Available-for-sale, Amortized Cost | 338,593 | 324,597
Within one year, Fair Value | 27,814 | 31,258
After one year through five years, Fair Value | 65,406 | 100,716
After five years through ten years, Fair Value | 95,366 | 60,137
After ten years, Fair Value | 127,089 | 141,569
Available-for-sale, Fair Value | 321,121 | 341,769
U.S. Agency-Based Mortgage-Backed Securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Without single maturity date, Amortized Cost | 5,984 | 7,944
Without single maturity date, Fair value | $ 5,446 | $ 8,089

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