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Schedule of Amortized Cost and Estimated Fair Value of Company's Fixed Maturities Securities (Detail) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Schedule Of Available For Sale Securities [Line Items]
Fixed maturities, Amortized Cost	$ 1,394,639	$ 1,322,092
Fixed maturities, Allowance for Expected Credit Losses	0	0
Fixed maturities, Gross Unrealized Gains	2,205	1,580
Fixed maturities, Gross Unrealized losses	(14,936)	(29,879)
Fixed maturities, Estimated Fair Value	1,381,908	1,293,793
U.S. Treasuries
Schedule Of Available For Sale Securities [Line Items]
Fixed maturities, Amortized Cost	875,273	497,099
Fixed maturities, Allowance for Expected Credit Losses	0	0
Fixed maturities, Gross Unrealized Gains	757	515
Fixed maturities, Gross Unrealized losses	(784)	(3,391)
Fixed maturities, Estimated Fair Value	875,246	494,223
Obligations of States and Political Subdivisions
Schedule Of Available For Sale Securities [Line Items]
Fixed maturities, Amortized Cost	17,125	27,326
Fixed maturities, Allowance for Expected Credit Losses	0	0
Fixed maturities, Gross Unrealized Gains	0	0
Fixed maturities, Gross Unrealized losses	(790)	(1,176)
Fixed maturities, Estimated Fair Value	16,335	26,150
Mortgage Backed Securities
Schedule Of Available For Sale Securities [Line Items]
Fixed maturities, Amortized Cost	61,905	63,173
Fixed maturities, Allowance for Expected Credit Losses	0	0
Fixed maturities, Gross Unrealized Gains	299	229
Fixed maturities, Gross Unrealized losses	(3,284)	(4,475)
Fixed maturities, Estimated Fair Value	58,920	58,927
Asset-backed Securities
Schedule Of Available For Sale Securities [Line Items]
Fixed maturities, Amortized Cost	137,445	207,375
Fixed maturities, Allowance for Expected Credit Losses	0	0
Fixed maturities, Gross Unrealized Gains	864	668
Fixed maturities, Gross Unrealized losses	(2,882)	(5,091)
Fixed maturities, Estimated Fair Value	135,427	202,952
Commercial Mortgage-Backed Securities
Schedule Of Available For Sale Securities [Line Items]
Fixed maturities, Amortized Cost	68,041	84,062
Fixed maturities, Allowance for Expected Credit Losses	0	0
Fixed maturities, Gross Unrealized Gains	15	12
Fixed maturities, Gross Unrealized losses	(2,488)	(4,994)
Fixed maturities, Estimated Fair Value	65,568	79,080
Corporate Bonds
Schedule Of Available For Sale Securities [Line Items]
Fixed maturities, Amortized Cost	158,798	298,526
Fixed maturities, Allowance for Expected Credit Losses	0	0
Fixed maturities, Gross Unrealized Gains	189	116
Fixed maturities, Gross Unrealized losses	(2,891)	(6,929)
Fixed maturities, Estimated Fair Value	156,096	291,713
Foreign Corporate Bonds
Schedule Of Available For Sale Securities [Line Items]
Fixed maturities, Amortized Cost	76,052	144,531
Fixed maturities, Allowance for Expected Credit Losses	0	0
Fixed maturities, Gross Unrealized Gains	81	40
Fixed maturities, Gross Unrealized losses	(1,817)	(3,823)
Fixed maturities, Estimated Fair Value	$ 74,316	$ 140,748

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