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Summary of Amortized Cost and Estimated Fair Value Through Fixed Maturities (Detail) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Schedule Of Available For Sale Securities [Line Items] |  |
Due in one year or less, Amortized Cost | $ 114,555 |
Due in one year through five years, Amortized Cost | 773,372 |
Due in five years through ten years, Amortized Cost | 29,200 |
Due in ten years through fifteen years, Amortized Cost | 202 |
Due after fifteen years, Amortized Cost | 13,896 |
Fixed maturities, Amortized Cost | 1,301,723 | $ 1,193,746
Due in one year or less, Estimated Fair value | 113,491 |
Due in one year through five years, Estimated Fair value | 747,197 |
Due in five years through ten years, Estimated Fair value | 25,594 |
Due in ten years through fifteen years, Estimated Fair value | 198 |
Due after fifteen years, Estimated Fair value | 11,538 |
Fixed Maturities, estimated fair value | 1,248,198 | 1,201,866
Mortgage Backed Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 67,560 |
Fixed maturities, Amortized Cost | 67,560 | 250,007
Estimated Fair value | 62,116 |
Fixed Maturities, estimated fair value | 62,116 | 250,341
Asset-backed Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 198,161 |
Fixed maturities, Amortized Cost | 198,161 | 172,916
Estimated Fair value | 189,400 |
Fixed Maturities, estimated fair value | 189,400 | 172,642
Commercial Mortgage-Backed Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 104,777 |
Fixed maturities, Amortized Cost | 104,777 | 135,017
Estimated Fair value | 98,664 |
Fixed Maturities, estimated fair value | $ 98,664 | $ 136,893

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