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Investments - Summary of Carrying Amounts and Fair Value of Investments in Fixed Maturity Securities, Classified as Held-to-Maturity (Detail) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Schedule Of Held To Maturity Securities [Line Items] |  |
Within one year, Carrying Amount | $ 57,626 | $ 54,316
After one year through five years, Carrying Amount | 169,880 | 195,706
After five years through ten years, Carrying Amount | 105,046 | 107,347
After ten years, Carrying Amount | 203,500 | 220,345
Held-to-maturity, Carrying Amount, Totals | 541,224 | 585,130
Within one year, Fair Value | 58,183 | 54,794
After one year through five years, Fair Value | 176,260 | 204,289
After five years through ten years, Fair Value | 110,513 | 113,643
After ten years, Fair Value | 218,838 | 240,860
Held-to-maturity, Fair Value, Totals | 569,445 | 621,654
U.S. Agency-Based Mortgage-Backed Securities [Member] |  |
Schedule Of Held To Maturity Securities [Line Items] |  |
Without single maturity, Carrying Amount | 5,060 | 7,261
Held-to-maturity, Carrying Amount, Totals | 5,060 | 7,261
Without single maturity, Fair Value | 5,534 | 7,906
Held-to-maturity, Fair Value, Totals | 5,534 | 7,906
Asset-Backed Securities [Member] |  |
Schedule Of Held To Maturity Securities [Line Items] |  |
Without single maturity, Carrying Amount | 112 | 155
Held-to-maturity, Carrying Amount, Totals | 112 | 155
Without single maturity, Fair Value | 117 | 162
Held-to-maturity, Fair Value, Totals | $ 117 | $ 162

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- Definition Fair value of investment in debt security measured at amortized cost (held-to-maturity), with single maturity date and allocated without single maturity date, maturing after tenth 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 Fair value of investment in debt security measured at amortized cost (held-to-maturity), with single maturity date and allocated without single maturity date, maturing in sixth through tenth 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 Fair value of investment in debt security measured at amortized cost (held-to-maturity), with single maturity date and allocated without single maturity date, maturing in second through fifth 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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