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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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