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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 | Dec. 31, 2022 | Dec. 31, 2021
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Schedule Of Held To Maturity Securities [Line Items] |  |
Within one year, Carrying Amount | $ 41,878 | $ 70,859
After one year through five years, Carrying Amount | 165,216 | 174,157
After five years through ten years, Carrying Amount | 121,739 | 100,543
After ten years, Carrying Amount | 159,093 | 198,945
Held-to-maturity, Carrying Amount, Totals | 491,688 | 549,231
Within one year, Fair Value | 41,652 | 71,455
After one year through five years, Fair Value | 159,006 | 180,376
After five years through ten years, Fair Value | 112,665 | 104,851
After ten years, Fair Value | 151,178 | 214,060
Without single maturity, Fair Value | 468,144 |
Held-to-maturity, Fair Value, Totals | 468,144 | 575,850
U.S. Agency-Based Mortgage-Backed Securities [Member] |  |
Schedule Of Held To Maturity Securities [Line Items] |  |
Without single maturity, Carrying Amount | 3,696 | 4,623
Held-to-maturity, Carrying Amount, Totals | 3,696 | 4,623
Without single maturity, Fair Value | 3,576 | 5,000
Held-to-maturity, Fair Value, Totals | 3,576 | 5,000
Asset-Backed Securities [Member] |  |
Schedule Of Held To Maturity Securities [Line Items] |  |
Without single maturity, Carrying Amount | 66 | 104
Held-to-maturity, Carrying Amount, Totals | 66 | 104
Without single maturity, Fair Value | 67 | 108
Held-to-maturity, Fair Value, Totals | $ 67 | $ 108

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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 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 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 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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