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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, 2021 | Dec. 31, 2020
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Schedule Of Available For Sale Securities [Line Items] |  |
Within one year, Amortized Cost | $ 32,152 | $ 69,177
After one year through five years, Amortized Cost | 88,065 | 80,593
After five years through ten years, Amortized Cost | 56,405 | 53,835
After ten years, Amortized Cost | 136,754 | 165,406
Available-for-sale, Amortized Cost | 322,863 | 387,665
Within one year, Fair Value | 32,718 | 69,938
After one year through five years, Fair Value | 92,012 | 85,829
After five years through ten years, Fair Value | 58,625 | 57,829
After ten years, Fair Value | 148,768 | 181,631
Available-for-sale, Fair Value | 341,838 | 414,279
U.S. Agency-Based Mortgage-Backed Securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Without single maturity date, Amortized Cost | 9,487 | 18,654
Available-for-sale, Amortized Cost | 9,487 | 18,654
Without single maturity date, Fair value | 9,715 | 19,052
Available-for-sale, Fair Value | $ 9,715 | $ 19,052

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