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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 | Mar. 31, 2021 | Dec. 31, 2020
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Schedule Of Available For Sale Securities [Line Items] |  |
Within one year, Amortized Cost | $ 62,627 | $ 69,177
After one year through five years, Amortized Cost | 89,766 | 80,593
After five years through ten years, Amortized Cost | 67,212 | 53,835
After ten years, Amortized Cost | 157,386 | 165,406
Available-for-sale, Amortized Cost | 391,687 | 387,665
Within one year, Fair Value | 63,083 | 69,938
After one year through five years, Fair Value | 94,312 | 85,829
After five years through ten years, Fair Value | 69,638 | 57,829
After ten years, Fair Value | 169,843 | 181,631
Available-for-sale, Fair Value | 411,904 | 414,279
U.S. Agency-Based Mortgage-Backed Securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Without single maturity date, Amortized Cost | 14,696 | 18,654
Available-for-sale, Amortized Cost | 14,696 | 18,654
Without single maturity date, Fair value | 15,028 | 19,052
Available-for-sale, Fair Value | $ 15,028 | $ 19,052

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- Definition Amortized cost of investment in debt security, measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in rolling sixth through tenth fiscal year following latest fiscal year. For interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date. + References No definition available. + Details
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