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Summary of Amortized Cost and Estimated Fair Value Through Fixed Maturities (Detail) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Schedule Of Available For Sale Securities [Line Items]
Due in one year or less, Amortized Cost	$ 323,345
Due in one year through five years, Amortized Cost	556,218
Due in five years through ten years, Amortized Cost	22,295
Due after fifteen years, Amortized Cost	12,698
Fixed maturities, Amortized Cost	1,300,148	$ 1,301,723
Due in one year or less, Estimated Fair value	318,732
Due in one year through five years, Estimated Fair value	538,542
Due in five years through ten years, Estimated Fair value	19,921
Due after fifteen years, Estimated Fair value	10,888
Fixed Maturities, estimated fair value	1,257,357	1,248,198
Mortgage Backed Securities
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	66,799
Fixed maturities, Amortized Cost	66,799	67,560
Estimated Fair value	62,482
Fixed Maturities, estimated fair value	62,482	62,116
Asset-backed Securities
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	214,005
Fixed maturities, Amortized Cost	214,005	198,161
Estimated Fair value	207,705
Fixed Maturities, estimated fair value	207,705	189,400
Commercial Mortgage-Backed Securities
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	104,788
Fixed maturities, Amortized Cost	104,788	104,777
Estimated Fair value	99,087
Fixed Maturities, estimated fair value	$ 99,087	$ 98,664

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