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Schedule of Amortized Cost and Estimated Fair Value of Company's Fixed Maturities Securities (Detail) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
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Schedule Of Available For Sale Securities [Line Items] |  |
Fixed maturities, Amortized Cost | $ 1,301,723 | $ 1,193,746
Fixed maturities, Allowance for Expected Credit Losses | 0 | 0
Fixed maturities, Gross Unrealized Gains | 591 | 15,751
Fixed maturities, Gross Unrealized losses | (54,116) | (7,631)
Fixed maturities, Estimated Fair Value | 1,248,198 | 1,201,866
U.S. Treasuries |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fixed maturities, Amortized Cost | 352,533 | 149,934
Fixed maturities, Allowance for Expected Credit Losses | 0 | 0
Fixed maturities, Gross Unrealized Gains | 0 | 603
Fixed maturities, Gross Unrealized losses | (8,430) | (419)
Fixed maturities, Estimated Fair Value | 344,103 | 150,118
Agency Obligations |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fixed maturities, Amortized Cost |  | 5,697
Fixed maturities, Allowance for Expected Credit Losses |  | 0
Fixed maturities, Gross Unrealized Gains |  | 1
Fixed maturities, Gross Unrealized losses |  | (68)
Fixed maturities, Estimated Fair Value |  | 5,630
Obligations of States and Political Subdivisions |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fixed maturities, Amortized Cost | 33,471 | 53,637
Fixed maturities, Allowance for Expected Credit Losses | 0 | 0
Fixed maturities, Gross Unrealized Gains | 0 | 1,385
Fixed maturities, Gross Unrealized losses | (1,876) | (301)
Fixed maturities, Estimated Fair Value | 31,595 | 54,721
Mortgage Backed Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fixed maturities, Amortized Cost | 67,560 | 250,007
Fixed maturities, Allowance for Expected Credit Losses | 0 | 0
Fixed maturities, Gross Unrealized Gains | 165 | 2,618
Fixed maturities, Gross Unrealized losses | (5,609) | (2,284)
Fixed maturities, Estimated Fair Value | 62,116 | 250,341
Asset-backed Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fixed maturities, Amortized Cost | 198,161 | 172,916
Fixed maturities, Allowance for Expected Credit Losses | 0 | 0
Fixed maturities, Gross Unrealized Gains | 390 | 700
Fixed maturities, Gross Unrealized losses | (9,151) | (974)
Fixed maturities, Estimated Fair Value | 189,400 | 172,642
Commercial Mortgage-Backed Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fixed maturities, Amortized Cost | 104,777 | 135,017
Fixed maturities, Allowance for Expected Credit Losses | 0 | 0
Fixed maturities, Gross Unrealized Gains | 20 | 2,503
Fixed maturities, Gross Unrealized losses | (6,133) | (627)
Fixed maturities, Estimated Fair Value | 98,664 | 136,893
Corporate Bonds |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fixed maturities, Amortized Cost | 353,622 | 288,866
Fixed maturities, Allowance for Expected Credit Losses | 0 | 0
Fixed maturities, Gross Unrealized Gains | 16 | 5,571
Fixed maturities, Gross Unrealized losses | (14,858) | (2,054)
Fixed maturities, Estimated Fair Value | 338,780 | 292,383
Foreign Corporate Bonds |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fixed maturities, Amortized Cost | 191,599 | 137,672
Fixed maturities, Allowance for Expected Credit Losses | 0 | 0
Fixed maturities, Gross Unrealized Gains | 0 | 2,370
Fixed maturities, Gross Unrealized losses | (8,059) | (904)
Fixed maturities, Estimated Fair Value | $ 183,540 | $ 139,138

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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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