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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, 2020 | Dec. 31, 2019
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Schedule Of Available For Sale Securities [Line Items] |  |
Within one year, Amortized Cost | $ 61,469 | $ 27,160
After one year through five years, Amortized Cost | 90,936 | 144,142
After five years through ten years, Amortized Cost | 56,622 | 47,175
After ten years, Amortized Cost | 168,186 | 177,722
Available-for-sale, Amortized Cost | 401,063 | 425,698
Within one year, Fair Value | 62,203 | 27,194
After one year through five years, Fair Value | 96,406 | 146,469
After five years through ten years, Fair Value | 60,484 | 49,419
After ten years, Fair Value | 182,834 | 188,597
Available-for-sale, Fair Value | 426,237 | 441,146
U.S. Agency-Based Mortgage-Backed Securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Without single maturity date, Amortized Cost | 23,850 | 29,499
Available-for-sale, Amortized Cost | 23,850 | 29,499
Without single maturity date, Fair value | 24,310 | 29,467
Available-for-sale, Fair Value | $ 24,310 | $ 29,467

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- Definition Fair value 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 next rolling 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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- 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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