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Schedule of Amortized Cost and Estimated Fair Value of Company's Fixed Maturities Securities (Detail) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Schedule Of Available For Sale Securities [Line Items] |  |
Fixed maturities, Amortized Cost | $ 1,334,130 | $ 1,301,723
Fixed maturities, Allowance for Expected Credit Losses | 0 | 0
Fixed maturities, Gross Unrealized Gains | 222 | 591
Fixed maturities, Gross Unrealized losses | (47,257) | (54,116)
Fixed maturities, Estimated Fair Value | 1,287,095 | 1,248,198
U.S. Treasuries |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fixed maturities, Amortized Cost | 451,829 | 352,533
Fixed maturities, Allowance for Expected Credit Losses | 0 | 0
Fixed maturities, Gross Unrealized Gains | 13 | 0
Fixed maturities, Gross Unrealized losses | (6,671) | (8,430)
Fixed maturities, Estimated Fair Value | 445,171 | 344,103
Obligations of States and Political Subdivisions |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fixed maturities, Amortized Cost | 27,975 | 33,471
Fixed maturities, Allowance for Expected Credit Losses | 0 | 0
Fixed maturities, Gross Unrealized Gains | 0 | 0
Fixed maturities, Gross Unrealized losses | (1,760) | (1,876)
Fixed maturities, Estimated Fair Value | 26,215 | 31,595
Mortgage Backed Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fixed maturities, Amortized Cost | 66,571 | 67,560
Fixed maturities, Allowance for Expected Credit Losses | 0 | 0
Fixed maturities, Gross Unrealized Gains | 18 | 165
Fixed maturities, Gross Unrealized losses | (7,487) | (5,609)
Fixed maturities, Estimated Fair Value | 59,102 | 62,116
Asset-backed Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fixed maturities, Amortized Cost | 208,011 | 198,161
Fixed maturities, Allowance for Expected Credit Losses | 0 | 0
Fixed maturities, Gross Unrealized Gains | 87 | 390
Fixed maturities, Gross Unrealized losses | (7,124) | (9,151)
Fixed maturities, Estimated Fair Value | 200,974 | 189,400
Commercial Mortgage-Backed Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fixed maturities, Amortized Cost | 85,375 | 104,777
Fixed maturities, Allowance for Expected Credit Losses | 0 | 0
Fixed maturities, Gross Unrealized Gains | 13 | 20
Fixed maturities, Gross Unrealized losses | (6,628) | (6,133)
Fixed maturities, Estimated Fair Value | 78,760 | 98,664
Corporate Bonds |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fixed maturities, Amortized Cost | 331,758 | 353,622
Fixed maturities, Allowance for Expected Credit Losses | 0 | 0
Fixed maturities, Gross Unrealized Gains | 80 | 16
Fixed maturities, Gross Unrealized losses | (11,351) | (14,858)
Fixed maturities, Estimated Fair Value | 320,487 | 338,780
Foreign Corporate Bonds |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fixed maturities, Amortized Cost | 162,611 | 191,599
Fixed maturities, Allowance for Expected Credit Losses | 0 | 0
Fixed maturities, Gross Unrealized Gains | 11 | 0
Fixed maturities, Gross Unrealized losses | (6,236) | (8,059)
Fixed maturities, Estimated Fair Value | $ 156,386 | $ 183,540

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