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Summary of Amortized Cost and Estimated Fair Value Through Fixed Maturities (Detail) - USD ($) $ in Thousands | Jun. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Schedule Of Available For Sale Securities [Line Items] |  |
Due in one year or less, Amortized Cost | $ 619,568 |
Due in one year through five years, Amortized Cost | 265,534 |
Due in five years through ten years, Amortized Cost | 6,193 |
Due after ten years, Amortized Cost | 9,829 |
Fixed maturities, Amortized Cost | 1,341,934 | $ 1,394,639
Due in one year or less, Estimated Fair value | 619,117 |
Due in one year through five years, Estimated Fair value | 264,967 |
Due in five years through ten years, Estimated Fair value | 5,763 |
Due after ten years, Estimated Fair value | 9,174 |
Fixed Maturities, estimated fair value | 1,336,344 | 1,381,908
Mortgage Backed Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 216,275 |
Fixed maturities, Amortized Cost | 216,275 | 61,905
Estimated Fair value | 214,991 |
Fixed Maturities, estimated fair value | 214,991 | 58,920
Asset-backed Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 158,153 |
Fixed maturities, Amortized Cost | 158,153 | 137,445
Estimated Fair value | 157,128 |
Fixed Maturities, estimated fair value | 157,128 | 135,427
Commercial Mortgage-Backed Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 66,382 |
Fixed maturities, Amortized Cost | 66,382 | 68,041
Estimated Fair value | 65,204 |
Fixed Maturities, estimated fair value | $ 65,204 | $ 65,568

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