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Schedule of Amortized Cost and Estimated Fair Value of Company's Fixed Maturities Securities (Detail) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Schedule Of Available For Sale Securities [Line Items] |  |
Fixed maturities, Amortized Cost | $ 1,404,854 | $ 1,322,092
Fixed maturities, Allowance for Expected Credit Losses | 0 | 0
Fixed maturities, Gross Unrealized Gains | 3,847 | 1,580
Fixed maturities, Gross Unrealized losses | (13,472) | (29,879)
Fixed maturities, Estimated Fair Value | 1,395,229 | 1,293,793
U.S. Treasuries |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fixed maturities, Amortized Cost | 889,891 | 497,099
Fixed maturities, Allowance for Expected Credit Losses | 0 | 0
Fixed maturities, Gross Unrealized Gains | 1,380 | 515
Fixed maturities, Gross Unrealized losses | (683) | (3,391)
Fixed maturities, Estimated Fair Value | 890,588 | 494,223
Obligations of States and Political Subdivisions |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fixed maturities, Amortized Cost | 17,807 | 27,326
Fixed maturities, Allowance for Expected Credit Losses | 0 | 0
Fixed maturities, Gross Unrealized Gains | 0 | 0
Fixed maturities, Gross Unrealized losses | (634) | (1,176)
Fixed maturities, Estimated Fair Value | 17,173 | 26,150
Mortgage Backed Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fixed maturities, Amortized Cost | 49,317 | 63,173
Fixed maturities, Allowance for Expected Credit Losses | 0 | 0
Fixed maturities, Gross Unrealized Gains | 598 | 229
Fixed maturities, Gross Unrealized losses | (2,438) | (4,475)
Fixed maturities, Estimated Fair Value | 47,477 | 58,927
Asset-backed Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fixed maturities, Amortized Cost | 159,166 | 207,375
Fixed maturities, Allowance for Expected Credit Losses | 0 | 0
Fixed maturities, Gross Unrealized Gains | 1,312 | 668
Fixed maturities, Gross Unrealized losses | (2,810) | (5,091)
Fixed maturities, Estimated Fair Value | 157,668 | 202,952
Commercial Mortgage-Backed Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fixed maturities, Amortized Cost | 76,675 | 84,062
Fixed maturities, Allowance for Expected Credit Losses | 0 | 0
Fixed maturities, Gross Unrealized Gains | 77 | 12
Fixed maturities, Gross Unrealized losses | (2,526) | (4,994)
Fixed maturities, Estimated Fair Value | 74,226 | 79,080
Corporate Bonds |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fixed maturities, Amortized Cost | 149,857 | 298,526
Fixed maturities, Allowance for Expected Credit Losses | 0 | 0
Fixed maturities, Gross Unrealized Gains | 317 | 116
Fixed maturities, Gross Unrealized losses | (2,777) | (6,929)
Fixed maturities, Estimated Fair Value | 147,397 | 291,713
Foreign Corporate Bonds |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fixed maturities, Amortized Cost | 62,141 | 144,531
Fixed maturities, Allowance for Expected Credit Losses | 0 | 0
Fixed maturities, Gross Unrealized Gains | 163 | 40
Fixed maturities, Gross Unrealized losses | (1,604) | (3,823)
Fixed maturities, Estimated Fair Value | $ 60,700 | $ 140,748

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