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Schedule of Amortized Cost and Estimated Fair Value of Company's Fixed Maturities Securities (Detail) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Schedule Of Available For Sale Securities [Line Items]
Fixed maturities, Amortized Cost	$ 1,250,975	$ 1,322,092
Fixed maturities, Allowance for Expected Credit Losses	0	0
Fixed maturities, Gross Unrealized Gains	1,437	1,580
Fixed maturities, Gross Unrealized losses	(26,103)	(29,879)
Fixed maturities, Estimated Fair Value	1,226,309	1,293,793
U.S. Treasuries
Schedule Of Available For Sale Securities [Line Items]
Fixed maturities, Amortized Cost	547,350	497,099
Fixed maturities, Allowance for Expected Credit Losses	0	0
Fixed maturities, Gross Unrealized Gains	36	515
Fixed maturities, Gross Unrealized losses	(2,843)	(3,391)
Fixed maturities, Estimated Fair Value	544,543	494,223
Obligations of States and Political Subdivisions
Schedule Of Available For Sale Securities [Line Items]
Fixed maturities, Amortized Cost	24,280	27,326
Fixed maturities, Allowance for Expected Credit Losses	0	0
Fixed maturities, Gross Unrealized Gains	0	0
Fixed maturities, Gross Unrealized losses	(1,188)	(1,176)
Fixed maturities, Estimated Fair Value	23,092	26,150
Mortgage Backed Securities
Schedule Of Available For Sale Securities [Line Items]
Fixed maturities, Amortized Cost	61,200	63,173
Fixed maturities, Allowance for Expected Credit Losses	0	0
Fixed maturities, Gross Unrealized Gains	486	229
Fixed maturities, Gross Unrealized losses	(4,144)	(4,475)
Fixed maturities, Estimated Fair Value	57,542	58,927
Asset-backed Securities
Schedule Of Available For Sale Securities [Line Items]
Fixed maturities, Amortized Cost	203,449	207,375
Fixed maturities, Allowance for Expected Credit Losses	0	0
Fixed maturities, Gross Unrealized Gains	687	668
Fixed maturities, Gross Unrealized losses	(4,441)	(5,091)
Fixed maturities, Estimated Fair Value	199,695	202,952
Commercial Mortgage-Backed Securities
Schedule Of Available For Sale Securities [Line Items]
Fixed maturities, Amortized Cost	82,027	84,062
Fixed maturities, Allowance for Expected Credit Losses	0	0
Fixed maturities, Gross Unrealized Gains	15	12
Fixed maturities, Gross Unrealized losses	(4,271)	(4,994)
Fixed maturities, Estimated Fair Value	77,771	79,080
Corporate Bonds
Schedule Of Available For Sale Securities [Line Items]
Fixed maturities, Amortized Cost	230,387	298,526
Fixed maturities, Allowance for Expected Credit Losses	0	0
Fixed maturities, Gross Unrealized Gains	168	116
Fixed maturities, Gross Unrealized losses	(5,891)	(6,929)
Fixed maturities, Estimated Fair Value	224,664	291,713
Foreign Corporate Bonds
Schedule Of Available For Sale Securities [Line Items]
Fixed maturities, Amortized Cost	102,282	144,531
Fixed maturities, Allowance for Expected Credit Losses	0	0
Fixed maturities, Gross Unrealized Gains	45	40
Fixed maturities, Gross Unrealized losses	(3,325)	(3,823)
Fixed maturities, Estimated Fair Value	$ 99,002	$ 140,748

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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