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Schedule of Amortized Cost and Estimated Fair Value of Company's Fixed Maturities Securities (Detail) - USD ($) $ in Thousands | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Schedule Of Available For Sale Securities [Line Items] |  |
Fixed maturities, Amortized Cost | $ 1,323,666 | $ 1,394,639
Fixed maturities, Allowance for Expected Credit Losses | 0 | 0
Fixed maturities, Gross Unrealized Gains | 3,050 | 2,205
Fixed maturities, Gross Unrealized losses | (11,317) | (14,936)
Fixed maturities, Estimated Fair Value | 1,315,399 | 1,381,908
U.S. Treasuries |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fixed maturities, Amortized Cost | 543,858 | 875,273
Fixed maturities, Allowance for Expected Credit Losses | 0 | 0
Fixed maturities, Gross Unrealized Gains | 74 | 757
Fixed maturities, Gross Unrealized losses | (422) | (784)
Fixed maturities, Estimated Fair Value | 543,510 | 875,246
Obligations of States and Political Subdivisions |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fixed maturities, Amortized Cost | 17,099 | 17,125
Fixed maturities, Allowance for Expected Credit Losses | 0 | 0
Fixed maturities, Gross Unrealized Gains | 0 | 0
Fixed maturities, Gross Unrealized losses | (615) | (790)
Fixed maturities, Estimated Fair Value | 16,484 | 16,335
Mortgage Backed Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fixed maturities, Amortized Cost | 210,360 | 61,905
Fixed maturities, Allowance for Expected Credit Losses | 0 | 0
Fixed maturities, Gross Unrealized Gains | 862 | 299
Fixed maturities, Gross Unrealized losses | (2,586) | (3,284)
Fixed maturities, Estimated Fair Value | 208,636 | 58,920
Asset-backed Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fixed maturities, Amortized Cost | 143,084 | 137,445
Fixed maturities, Allowance for Expected Credit Losses | 0 | 0
Fixed maturities, Gross Unrealized Gains | 962 | 864
Fixed maturities, Gross Unrealized losses | (2,346) | (2,882)
Fixed maturities, Estimated Fair Value | 141,700 | 135,427
Commercial Mortgage-Backed Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fixed maturities, Amortized Cost | 69,010 | 68,041
Fixed maturities, Allowance for Expected Credit Losses | 0 | 0
Fixed maturities, Gross Unrealized Gains | 333 | 15
Fixed maturities, Gross Unrealized losses | (1,786) | (2,488)
Fixed maturities, Estimated Fair Value | 67,557 | 65,568
Corporate Bonds |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fixed maturities, Amortized Cost | 247,440 | 158,798
Fixed maturities, Allowance for Expected Credit Losses | 0 | 0
Fixed maturities, Gross Unrealized Gains | 595 | 189
Fixed maturities, Gross Unrealized losses | (2,151) | (2,891)
Fixed maturities, Estimated Fair Value | 245,884 | 156,096
Foreign Corporate Bonds |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fixed maturities, Amortized Cost | 92,815 | 76,052
Fixed maturities, Allowance for Expected Credit Losses | 0 | 0
Fixed maturities, Gross Unrealized Gains | 224 | 81
Fixed maturities, Gross Unrealized losses | (1,411) | (1,817)
Fixed maturities, Estimated Fair Value | $ 91,628 | $ 74,316

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-2 + Details
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