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Schedule of Amortized Cost and Estimated Fair Value of Company's Fixed Maturities Securities (Detail) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Schedule Of Available For Sale Securities [Line Items]
Fixed maturities, Amortized Cost	$ 1,311,567	$ 1,301,723
Fixed maturities, Allowance for Expected Credit Losses	0	0
Fixed maturities, Gross Unrealized Gains	747	591
Fixed maturities, Gross Unrealized losses	(46,708)	(54,116)
Fixed maturities, Estimated Fair Value	1,265,606	1,248,198
U.S. Treasuries
Schedule Of Available For Sale Securities [Line Items]
Fixed maturities, Amortized Cost	396,451	352,533
Fixed maturities, Allowance for Expected Credit Losses	0	0
Fixed maturities, Gross Unrealized Gains	12	0
Fixed maturities, Gross Unrealized losses	(7,701)	(8,430)
Fixed maturities, Estimated Fair Value	388,762	344,103
Obligations of States and Political Subdivisions
Schedule Of Available For Sale Securities [Line Items]
Fixed maturities, Amortized Cost	32,272	33,471
Fixed maturities, Allowance for Expected Credit Losses	0	0
Fixed maturities, Gross Unrealized Gains	0	0
Fixed maturities, Gross Unrealized losses	(1,666)	(1,876)
Fixed maturities, Estimated Fair Value	30,606	31,595
Mortgage Backed Securities
Schedule Of Available For Sale Securities [Line Items]
Fixed maturities, Amortized Cost	65,086	67,560
Fixed maturities, Allowance for Expected Credit Losses	0	0
Fixed maturities, Gross Unrealized Gains	396	165
Fixed maturities, Gross Unrealized losses	(4,816)	(5,609)
Fixed maturities, Estimated Fair Value	60,666	62,116
Asset-backed Securities
Schedule Of Available For Sale Securities [Line Items]
Fixed maturities, Amortized Cost	212,095	198,161
Fixed maturities, Allowance for Expected Credit Losses	0	0
Fixed maturities, Gross Unrealized Gains	186	390
Fixed maturities, Gross Unrealized losses	(7,966)	(9,151)
Fixed maturities, Estimated Fair Value	204,315	189,400
Commercial Mortgage-Backed Securities
Schedule Of Available For Sale Securities [Line Items]
Fixed maturities, Amortized Cost	86,313	104,777
Fixed maturities, Allowance for Expected Credit Losses	0	0
Fixed maturities, Gross Unrealized Gains	21	20
Fixed maturities, Gross Unrealized losses	(5,880)	(6,133)
Fixed maturities, Estimated Fair Value	80,454	98,664
Corporate Bonds
Schedule Of Available For Sale Securities [Line Items]
Fixed maturities, Amortized Cost	343,600	353,622
Fixed maturities, Allowance for Expected Credit Losses	0	0
Fixed maturities, Gross Unrealized Gains	102	16
Fixed maturities, Gross Unrealized losses	(12,038)	(14,858)
Fixed maturities, Estimated Fair Value	331,664	338,780
Foreign Corporate Bonds
Schedule Of Available For Sale Securities [Line Items]
Fixed maturities, Amortized Cost	175,750	191,599
Fixed maturities, Allowance for Expected Credit Losses	0	0
Fixed maturities, Gross Unrealized Gains	30	0
Fixed maturities, Gross Unrealized losses	(6,641)	(8,059)
Fixed maturities, Estimated Fair Value	$ 169,139	$ 183,540

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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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