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Schedule of Amortized Cost and Estimated Fair Value of Company's Fixed Maturities Securities (Detail) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Schedule Of Available For Sale Securities [Line Items]
Fixed maturities, Amortized Cost	$ 1,404,854	$ 1,322,092
Fixed maturities, Allowance for Expected Credit Losses	0	0
Fixed maturities, Gross Unrealized Gains	3,847	1,580
Fixed maturities, Gross Unrealized losses	(13,472)	(29,879)
Fixed maturities, Estimated Fair Value	1,395,229	1,293,793
U.S. Treasuries
Schedule Of Available For Sale Securities [Line Items]
Fixed maturities, Amortized Cost	889,891	497,099
Fixed maturities, Allowance for Expected Credit Losses	0	0
Fixed maturities, Gross Unrealized Gains	1,380	515
Fixed maturities, Gross Unrealized losses	(683)	(3,391)
Fixed maturities, Estimated Fair Value	890,588	494,223
Obligations of States and Political Subdivisions
Schedule Of Available For Sale Securities [Line Items]
Fixed maturities, Amortized Cost	17,807	27,326
Fixed maturities, Allowance for Expected Credit Losses	0	0
Fixed maturities, Gross Unrealized Gains	0	0
Fixed maturities, Gross Unrealized losses	(634)	(1,176)
Fixed maturities, Estimated Fair Value	17,173	26,150
Mortgage Backed Securities
Schedule Of Available For Sale Securities [Line Items]
Fixed maturities, Amortized Cost	49,317	63,173
Fixed maturities, Allowance for Expected Credit Losses	0	0
Fixed maturities, Gross Unrealized Gains	598	229
Fixed maturities, Gross Unrealized losses	(2,438)	(4,475)
Fixed maturities, Estimated Fair Value	47,477	58,927
Asset-backed Securities
Schedule Of Available For Sale Securities [Line Items]
Fixed maturities, Amortized Cost	159,166	207,375
Fixed maturities, Allowance for Expected Credit Losses	0	0
Fixed maturities, Gross Unrealized Gains	1,312	668
Fixed maturities, Gross Unrealized losses	(2,810)	(5,091)
Fixed maturities, Estimated Fair Value	157,668	202,952
Commercial Mortgage-Backed Securities
Schedule Of Available For Sale Securities [Line Items]
Fixed maturities, Amortized Cost	76,675	84,062
Fixed maturities, Allowance for Expected Credit Losses	0	0
Fixed maturities, Gross Unrealized Gains	77	12
Fixed maturities, Gross Unrealized losses	(2,526)	(4,994)
Fixed maturities, Estimated Fair Value	74,226	79,080
Corporate Bonds
Schedule Of Available For Sale Securities [Line Items]
Fixed maturities, Amortized Cost	149,857	298,526
Fixed maturities, Allowance for Expected Credit Losses	0	0
Fixed maturities, Gross Unrealized Gains	317	116
Fixed maturities, Gross Unrealized losses	(2,777)	(6,929)
Fixed maturities, Estimated Fair Value	147,397	291,713
Foreign Corporate Bonds
Schedule Of Available For Sale Securities [Line Items]
Fixed maturities, Amortized Cost	62,141	144,531
Fixed maturities, Allowance for Expected Credit Losses	0	0
Fixed maturities, Gross Unrealized Gains	163	40
Fixed maturities, Gross Unrealized losses	(1,604)	(3,823)
Fixed maturities, Estimated Fair Value	$ 60,700	$ 140,748

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