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Schedule of Amortized Cost and Estimated Fair Value of Company's Fixed Maturities Securities (Detail) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Schedule Of Available For Sale Securities [Line Items] |  |
Fixed maturities, Amortized Cost | $ 1,314,418 | $ 1,394,639
Fixed maturities, Allowance for Expected Credit Losses | 0 | 0
Fixed maturities, Gross Unrealized Gains | 5,713 | 2,205
Fixed maturities, Gross Unrealized losses | (10,752) | (14,936)
Fixed maturities, Estimated Fair Value | 1,309,379 | 1,381,908
U.S. Treasuries |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fixed maturities, Amortized Cost | 577,064 | 875,273
Fixed maturities, Allowance for Expected Credit Losses | 0 | 0
Fixed maturities, Gross Unrealized Gains | 111 | 757
Fixed maturities, Gross Unrealized losses | (174) | (784)
Fixed maturities, Estimated Fair Value | 577,001 | 875,246
Obligations of States and Political Subdivisions |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fixed maturities, Amortized Cost | 14,540 | 17,125
Fixed maturities, Allowance for Expected Credit Losses | 0 | 0
Fixed maturities, Gross Unrealized Gains | 0 | 0
Fixed maturities, Gross Unrealized losses | (390) | (790)
Fixed maturities, Estimated Fair Value | 14,150 | 16,335
Mortgage Backed Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fixed maturities, Amortized Cost | 224,318 | 61,905
Fixed maturities, Allowance for Expected Credit Losses | 0 | 0
Fixed maturities, Gross Unrealized Gains | 2,301 | 299
Fixed maturities, Gross Unrealized losses | (3,412) | (3,284)
Fixed maturities, Estimated Fair Value | 223,207 | 58,920
Asset-backed Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fixed maturities, Amortized Cost | 153,311 | 137,445
Fixed maturities, Allowance for Expected Credit Losses | 0 | 0
Fixed maturities, Gross Unrealized Gains | 1,291 | 864
Fixed maturities, Gross Unrealized losses | (3,616) | (2,882)
Fixed maturities, Estimated Fair Value | 150,986 | 135,427
Commercial Mortgage-Backed Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fixed maturities, Amortized Cost | 58,250 | 68,041
Fixed maturities, Allowance for Expected Credit Losses | 0 | 0
Fixed maturities, Gross Unrealized Gains | 414 | 15
Fixed maturities, Gross Unrealized losses | (1,343) | (2,488)
Fixed maturities, Estimated Fair Value | 57,321 | 65,568
Corporate Bonds |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fixed maturities, Amortized Cost | 205,176 | 158,798
Fixed maturities, Allowance for Expected Credit Losses | 0 | 0
Fixed maturities, Gross Unrealized Gains | 1,191 | 189
Fixed maturities, Gross Unrealized losses | (1,099) | (2,891)
Fixed maturities, Estimated Fair Value | 205,268 | 156,096
Foreign Corporate Bonds |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fixed maturities, Amortized Cost | 81,759 | 76,052
Fixed maturities, Allowance for Expected Credit Losses | 0 | 0
Fixed maturities, Gross Unrealized Gains | 405 | 81
Fixed maturities, Gross Unrealized losses | (718) | (1,817)
Fixed maturities, Estimated Fair Value | $ 81,446 | $ 74,316

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