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Summary of Amortized Cost and Estimated Fair Value Through Fixed Maturities (Detail) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Schedule Of Available For Sale Securities [Line Items] |  |
Due in one year or less, Amortized Cost | $ 605,240 |
Due in one year through five years, Amortized Cost | 259,054 |
Due in five years through ten years, Amortized Cost | 5,193 |
Due after ten years, Amortized Cost | 9,052 |
Fixed maturities, Amortized Cost | 1,314,418 | $ 1,394,639
Due in one year or less, Estimated Fair value | 605,055 |
Due in one year through five years, Estimated Fair value | 259,264 |
Due in five years through ten years, Estimated Fair value | 5,012 |
Due after ten years, Estimated Fair value | 8,534 |
Fixed Maturities, estimated fair value | 1,309,379 | 1,381,908
Mortgage Backed Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 224,318 |
Fixed maturities, Amortized Cost | 224,318 | 61,905
Estimated Fair value | 223,207 |
Fixed Maturities, estimated fair value | 223,207 | 58,920
Asset-backed Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 153,311 |
Fixed maturities, Amortized Cost | 153,311 | 137,445
Estimated Fair value | 150,986 |
Fixed Maturities, estimated fair value | 150,986 | 135,427
Commercial Mortgage-Backed Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 58,250 |
Fixed maturities, Amortized Cost | 58,250 | 68,041
Estimated Fair value | 57,321 |
Fixed Maturities, estimated fair value | $ 57,321 | $ 65,568

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