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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
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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

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563 + Details
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