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Summary of Amortized Cost and Estimated Fair Value Through Fixed Maturities (Detail) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Schedule Of Available For Sale Securities [Line Items]
Due in one year or less, Amortized Cost	$ 945,787
Due in one year through five years, Amortized Cost	153,185
Due in five years through ten years, Amortized Cost	10,807
Due after ten years, Amortized Cost	9,917
Fixed maturities, Amortized Cost	1,404,854	$ 1,322,092
Due in one year or less, Estimated Fair value	946,078
Due in one year through five years, Estimated Fair value	150,427
Due in five years through ten years, Estimated Fair value	10,090
Due after ten years, Estimated Fair value	9,263
Fixed Maturities, estimated fair value	1,395,229	1,293,793
Mortgage Backed Securities
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	49,317
Fixed maturities, Amortized Cost	49,317	63,173
Estimated Fair value	47,477
Fixed Maturities, estimated fair value	47,477	58,927
Asset-backed Securities
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	159,166
Fixed maturities, Amortized Cost	159,166	207,375
Estimated Fair value	157,668
Fixed Maturities, estimated fair value	157,668	202,952
Commercial Mortgage-Backed Securities
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	76,675
Fixed maturities, Amortized Cost	76,675	84,062
Estimated Fair value	74,226
Fixed Maturities, estimated fair value	$ 74,226	$ 79,080

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