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Schedule of Amortized Cost and Estimated Fair Value of Company's Fixed Maturities Securities (Detail) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Schedule Of Available For Sale Securities [Line Items]
Fixed maturities, Amortized Cost	$ 1,362,384	$ 1,322,092
Fixed maturities, Allowance for Expected Credit Losses	0	0
Fixed maturities, Gross Unrealized Gains	1,406	1,580
Fixed maturities, Gross Unrealized losses	(23,744)	(29,879)
Fixed maturities, Estimated Fair Value	1,340,046	1,293,793
U.S. Treasuries
Schedule Of Available For Sale Securities [Line Items]
Fixed maturities, Amortized Cost	764,718	497,099
Fixed maturities, Allowance for Expected Credit Losses	0	0
Fixed maturities, Gross Unrealized Gains	18	515
Fixed maturities, Gross Unrealized losses	(2,585)	(3,391)
Fixed maturities, Estimated Fair Value	762,151	494,223
Obligations of States and Political Subdivisions
Schedule Of Available For Sale Securities [Line Items]
Fixed maturities, Amortized Cost	20,449	27,326
Fixed maturities, Allowance for Expected Credit Losses	0	0
Fixed maturities, Gross Unrealized Gains	0	0
Fixed maturities, Gross Unrealized losses	(1,068)	(1,176)
Fixed maturities, Estimated Fair Value	19,381	26,150
Mortgage Backed Securities
Schedule Of Available For Sale Securities [Line Items]
Fixed maturities, Amortized Cost	58,825	63,173
Fixed maturities, Allowance for Expected Credit Losses	0	0
Fixed maturities, Gross Unrealized Gains	510	229
Fixed maturities, Gross Unrealized losses	(3,972)	(4,475)
Fixed maturities, Estimated Fair Value	55,363	58,927
Asset-backed Securities
Schedule Of Available For Sale Securities [Line Items]
Fixed maturities, Amortized Cost	178,730	207,375
Fixed maturities, Allowance for Expected Credit Losses	0	0
Fixed maturities, Gross Unrealized Gains	638	668
Fixed maturities, Gross Unrealized losses	(3,750)	(5,091)
Fixed maturities, Estimated Fair Value	175,618	202,952
Commercial Mortgage-Backed Securities
Schedule Of Available For Sale Securities [Line Items]
Fixed maturities, Amortized Cost	76,904	84,062
Fixed maturities, Allowance for Expected Credit Losses	0	0
Fixed maturities, Gross Unrealized Gains	16	12
Fixed maturities, Gross Unrealized losses	(4,159)	(4,994)
Fixed maturities, Estimated Fair Value	72,761	79,080
Corporate Bonds
Schedule Of Available For Sale Securities [Line Items]
Fixed maturities, Amortized Cost	180,833	298,526
Fixed maturities, Allowance for Expected Credit Losses	0	0
Fixed maturities, Gross Unrealized Gains	188	116
Fixed maturities, Gross Unrealized losses	(5,152)	(6,929)
Fixed maturities, Estimated Fair Value	175,869	291,713
Foreign Corporate Bonds
Schedule Of Available For Sale Securities [Line Items]
Fixed maturities, Amortized Cost	81,925	144,531
Fixed maturities, Allowance for Expected Credit Losses	0	0
Fixed maturities, Gross Unrealized Gains	36	40
Fixed maturities, Gross Unrealized losses	(3,058)	(3,823)
Fixed maturities, Estimated Fair Value	$ 78,903	$ 140,748

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