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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, 2022 | Dec. 31, 2021
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Schedule Of Available For Sale Securities [Line Items] |  |
Within one year, Amortized Cost | $ 38,171 | $ 30,925
After one year through five years, Amortized Cost | 71,031 | 97,830
After five years through ten years, Amortized Cost | 100,619 | 58,050
After ten years, Amortized Cost | 135,089 | 129,848
Available-for-sale, Amortized Cost | 351,118 | 324,597
Within one year, Fair Value | 37,570 | 31,258
After one year through five years, Fair Value | 67,053 | 100,716
After five years through ten years, Fair Value | 91,651 | 60,137
After ten years, Fair Value | 124,038 | 141,569
Available-for-sale, Fair Value | 325,891 | 341,769
U.S. Agency-Based Mortgage-Backed Securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Without single maturity date, Amortized Cost | 6,208 | 7,944
Without single maturity date, Fair value | $ 5,579 | $ 8,089

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