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Summary of Amortized Cost and Estimated Fair Value Through Fixed Maturities (Detail) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Schedule Of Available For Sale Securities [Line Items]
Due in one year or less, Amortized Cost	$ 923,761
Due in one year through five years, Amortized Cost	184,069
Due in five years through ten years, Amortized Cost	9,524
Due after ten years, Amortized Cost	9,894
Fixed maturities, Amortized Cost	1,394,639	$ 1,322,092
Due in one year or less, Estimated Fair value	923,861
Due in one year through five years, Estimated Fair value	180,523
Due in five years through ten years, Estimated Fair value	8,600
Due after ten years, Estimated Fair value	9,009
Fixed Maturities, estimated fair value	1,381,908	1,293,793
Mortgage Backed Securities
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	61,905
Fixed maturities, Amortized Cost	61,905	63,173
Estimated Fair value	58,920
Fixed Maturities, estimated fair value	58,920	58,927
Asset-backed Securities
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	137,445
Fixed maturities, Amortized Cost	137,445	207,375
Estimated Fair value	135,427
Fixed Maturities, estimated fair value	135,427	202,952
Commercial Mortgage-Backed Securities
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	68,041
Fixed maturities, Amortized Cost	68,041	84,062
Estimated Fair value	65,568
Fixed Maturities, estimated fair value	$ 65,568	$ 79,080

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