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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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