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Summary of Amortized Cost and Estimated Fair Value Through Fixed Maturities (Detail) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Schedule Of Available For Sale Securities [Line Items] |  |
Due in one year or less, Amortized Cost | $ 632,837 |
Due in one year through five years, Amortized Cost | 247,306 |
Due in five years through ten years, Amortized Cost | 12,694 |
Due after ten years, Amortized Cost | 11,462 |
Fixed maturities, Amortized Cost | 1,250,975 | $ 1,322,092
Due in one year or less, Estimated Fair value | 630,760 |
Due in one year through five years, Estimated Fair value | 238,850 |
Due in five years through ten years, Estimated Fair value | 11,330 |
Due after ten years, Estimated Fair value | 10,361 |
Fixed Maturities, estimated fair value | 1,226,309 | 1,293,793
Mortgage Backed Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 61,200 |
Fixed maturities, Amortized Cost | 61,200 | 63,173
Estimated Fair value | 57,542 |
Fixed Maturities, estimated fair value | 57,542 | 58,927
Asset-backed Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 203,449 |
Fixed maturities, Amortized Cost | 203,449 | 207,375
Estimated Fair value | 199,695 |
Fixed Maturities, estimated fair value | 199,695 | 202,952
Commercial Mortgage-Backed Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 82,027 |
Fixed maturities, Amortized Cost | 82,027 | 84,062
Estimated Fair value | 77,771 |
Fixed Maturities, estimated fair value | $ 77,771 | $ 79,080

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