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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, 2024 | Dec. 31, 2023
--- | --- | ---
Schedule Of Held To Maturity Securities [Line Items] |  |
Within one year, Carrying Amount | $ 47,290 | $ 64,129
After one year through five years, Carrying Amount | 115,402 | 136,854
After five years through ten years, Carrying Amount | 113,949 | 114,990
After ten years, Carrying Amount | 156,835 | 164,270
Held-to-maturity, Carrying Amount, Totals | 436,369 | 483,575
Within one year, Fair Value | 46,978 | 63,703
After one year through five years, Fair Value | 112,425 | 131,396
After five years through ten years, Fair Value | 110,703 | 110,814
After ten years, Fair Value | 157,402 | 163,944
Held-to-maturity, Fair Value, Totals | 430,353 | 473,092
U.S. Agency-Based Mortgage-Backed Securities [Member] |  |
Schedule Of Held To Maturity Securities [Line Items] |  |
Without single maturity, Carrying Amount | 2,877 | 3,297
Held-to-maturity, Carrying Amount, Totals | 2,877 | 3,297
Without single maturity, Fair Value | 2,829 | 3,199
Held-to-maturity, Fair Value, Totals | 2,829 | 3,199
Asset-Backed Securities [Member] |  |
Schedule Of Held To Maturity Securities [Line Items] |  |
Without single maturity, Carrying Amount | 16 | 35
Held-to-maturity, Carrying Amount, Totals | 16 | 35
Without single maturity, Fair Value | 16 | 36
Held-to-maturity, Fair Value, Totals | $ 16 | $ 36

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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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