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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 | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Schedule Of Held To Maturity Securities [Line Items] |  |
Within one year, Carrying Amount | $ 46,809 | $ 49,303
After one year through five years, Carrying Amount | 84,055 | 93,087
After five years through ten years, Carrying Amount | 119,428 | 115,307
After ten years, Carrying Amount | 146,244 | 152,570
Held-to-maturity, Carrying Amount, Totals | 399,241 | 413,061
Within one year, Fair Value | 46,468 | 48,831
After one year through five years, Fair Value | 81,338 | 89,418
After five years through ten years, Fair Value | 113,802 | 109,812
After ten years, Fair Value | 141,769 | 149,004
Held-to-maturity, Fair Value, Totals | 385,981 | 399,721
U.S. Agency-Based Mortgage-Backed Securities [Member] |  |
Schedule Of Held To Maturity Securities [Line Items] |  |
Without single maturity, Carrying Amount | 2,696 | 2,781
Held-to-maturity, Carrying Amount, Totals | 2,696 | 2,781
Without single maturity, Fair Value | 2,595 | 2,643
Held-to-maturity, Fair Value, Totals | 2,595 | 2,643
Asset-Backed Securities [Member] |  |
Schedule Of Held To Maturity Securities [Line Items] |  |
Without single maturity, Carrying Amount | 9 | 13
Held-to-maturity, Carrying Amount, Totals | 9 | 13
Without single maturity, Fair Value | 9 | 13
Held-to-maturity, Fair Value, Totals | $ 9 | $ 13

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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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