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Schedule of Amortized Cost and Estimated Fair Value of Company's Fixed Maturities Securities (Detail) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Schedule Of Available For Sale Securities [Line Items]
Fixed maturities, Amortized Cost	$ 1,314,418	$ 1,394,639
Fixed maturities, Allowance for Expected Credit Losses	0	0
Fixed maturities, Gross Unrealized Gains	5,713	2,205
Fixed maturities, Gross Unrealized losses	(10,752)	(14,936)
Fixed maturities, Estimated Fair Value	1,309,379	1,381,908
U.S. Treasuries
Schedule Of Available For Sale Securities [Line Items]
Fixed maturities, Amortized Cost	577,064	875,273
Fixed maturities, Allowance for Expected Credit Losses	0	0
Fixed maturities, Gross Unrealized Gains	111	757
Fixed maturities, Gross Unrealized losses	(174)	(784)
Fixed maturities, Estimated Fair Value	577,001	875,246
Obligations of States and Political Subdivisions
Schedule Of Available For Sale Securities [Line Items]
Fixed maturities, Amortized Cost	14,540	17,125
Fixed maturities, Allowance for Expected Credit Losses	0	0
Fixed maturities, Gross Unrealized Gains	0	0
Fixed maturities, Gross Unrealized losses	(390)	(790)
Fixed maturities, Estimated Fair Value	14,150	16,335
Mortgage Backed Securities
Schedule Of Available For Sale Securities [Line Items]
Fixed maturities, Amortized Cost	224,318	61,905
Fixed maturities, Allowance for Expected Credit Losses	0	0
Fixed maturities, Gross Unrealized Gains	2,301	299
Fixed maturities, Gross Unrealized losses	(3,412)	(3,284)
Fixed maturities, Estimated Fair Value	223,207	58,920
Asset-backed Securities
Schedule Of Available For Sale Securities [Line Items]
Fixed maturities, Amortized Cost	153,311	137,445
Fixed maturities, Allowance for Expected Credit Losses	0	0
Fixed maturities, Gross Unrealized Gains	1,291	864
Fixed maturities, Gross Unrealized losses	(3,616)	(2,882)
Fixed maturities, Estimated Fair Value	150,986	135,427
Commercial Mortgage-Backed Securities
Schedule Of Available For Sale Securities [Line Items]
Fixed maturities, Amortized Cost	58,250	68,041
Fixed maturities, Allowance for Expected Credit Losses	0	0
Fixed maturities, Gross Unrealized Gains	414	15
Fixed maturities, Gross Unrealized losses	(1,343)	(2,488)
Fixed maturities, Estimated Fair Value	57,321	65,568
Corporate Bonds
Schedule Of Available For Sale Securities [Line Items]
Fixed maturities, Amortized Cost	205,176	158,798
Fixed maturities, Allowance for Expected Credit Losses	0	0
Fixed maturities, Gross Unrealized Gains	1,191	189
Fixed maturities, Gross Unrealized losses	(1,099)	(2,891)
Fixed maturities, Estimated Fair Value	205,268	156,096
Foreign Corporate Bonds
Schedule Of Available For Sale Securities [Line Items]
Fixed maturities, Amortized Cost	81,759	76,052
Fixed maturities, Allowance for Expected Credit Losses	0	0
Fixed maturities, Gross Unrealized Gains	405	81
Fixed maturities, Gross Unrealized losses	(718)	(1,817)
Fixed maturities, Estimated Fair Value	$ 81,446	$ 74,316

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