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Investments - Scheduled Contractual Maturities of Fixed-Maturity Securities (Detail) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
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Investments Debt And Equity Securities [Abstract] |  |
Due in one year or less, Amortized Cost | $ 34,594 | $ 63,135
Due after one year through five years, Amortized Cost | 48,555 | 125,833
Due after five years through ten years, Amortized Cost | 3,109 | 6,896
Due after ten years, Amortized Cost | 4,908 | 4,090
Fixed-maturity securities, Cost or Amortized Cost | 91,166 | 199,954
Due in one year or less, Fair Value | 34,814 | 63,429
Due after one year through five years, Fair Value | 49,329 | 127,660
Due after five years through ten years, Fair Value | 3,410 | 7,350
Due after ten years, Fair Value | 5,190 | 4,400
Fair Value Total | $ 92,743 | $ 202,839

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