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Schedule of Amortized Cost and Estimated Fair Value of Company's Fixed Maturities Securities (Detail) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Schedule Of Available For Sale Securities [Line Items]    
Fixed maturities, Amortized Cost $ 1,300,148 $ 1,301,723
Fixed maturities, Allowance for Expected Credit Losses 0 0
Fixed maturities, Gross Unrealized Gains 1,313 591
Fixed maturities, Gross Unrealized losses (44,104) (54,116)
Fixed maturities, Estimated Fair Value 1,257,357 1,248,198
U.S. Treasuries    
Schedule Of Available For Sale Securities [Line Items]    
Fixed maturities, Amortized Cost 337,865 352,533
Fixed maturities, Allowance for Expected Credit Losses 0 0
Fixed maturities, Gross Unrealized Gains 102 0
Fixed maturities, Gross Unrealized losses (5,661) (8,430)
Fixed maturities, Estimated Fair Value 332,306 344,103
Obligations of States and Political Subdivisions    
Schedule Of Available For Sale Securities [Line Items]    
Fixed maturities, Amortized Cost 33,386 33,471
Fixed maturities, Allowance for Expected Credit Losses 0 0
Fixed maturities, Gross Unrealized Gains 0 0
Fixed maturities, Gross Unrealized losses (1,513) (1,876)
Fixed maturities, Estimated Fair Value 31,873 31,595
Mortgage Backed Securities    
Schedule Of Available For Sale Securities [Line Items]    
Fixed maturities, Amortized Cost 66,799 67,560
Fixed maturities, Allowance for Expected Credit Losses 0 0
Fixed maturities, Gross Unrealized Gains 421 165
Fixed maturities, Gross Unrealized losses (4,738) (5,609)
Fixed maturities, Estimated Fair Value 62,482 62,116
Asset-backed Securities    
Schedule Of Available For Sale Securities [Line Items]    
Fixed maturities, Amortized Cost 214,005 198,161
Fixed maturities, Allowance for Expected Credit Losses 0 0
Fixed maturities, Gross Unrealized Gains 695 390
Fixed maturities, Gross Unrealized losses (6,995) (9,151)
Fixed maturities, Estimated Fair Value 207,705 189,400
Commercial Mortgage-Backed Securities    
Schedule Of Available For Sale Securities [Line Items]    
Fixed maturities, Amortized Cost 104,788 104,777
Fixed maturities, Allowance for Expected Credit Losses 0 0
Fixed maturities, Gross Unrealized Gains 22 20
Fixed maturities, Gross Unrealized losses (5,723) (6,133)
Fixed maturities, Estimated Fair Value 99,087 98,664
Corporate Bonds    
Schedule Of Available For Sale Securities [Line Items]    
Fixed maturities, Amortized Cost 353,329 353,622
Fixed maturities, Allowance for Expected Credit Losses 0 0
Fixed maturities, Gross Unrealized Gains 68 16
Fixed maturities, Gross Unrealized losses (12,237) (14,858)
Fixed maturities, Estimated Fair Value 341,160 338,780
Foreign Corporate Bonds    
Schedule Of Available For Sale Securities [Line Items]    
Fixed maturities, Amortized Cost 189,976 191,599
Fixed maturities, Allowance for Expected Credit Losses 0 0
Fixed maturities, Gross Unrealized Gains 5 0
Fixed maturities, Gross Unrealized losses (7,237) (8,059)
Fixed maturities, Estimated Fair Value $ 182,744 $ 183,540