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Schedule of Amortized Cost and Estimated Fair Value of Company's Fixed Maturities Securities (Detail) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
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Schedule Of Available For Sale Securities [Line Items] |  |
Fixed maturities, Amortized Cost | $ 1,250,975 | $ 1,322,092
Fixed maturities, Allowance for Expected Credit Losses | 0 | 0
Fixed maturities, Gross Unrealized Gains | 1,437 | 1,580
Fixed maturities, Gross Unrealized losses | (26,103) | (29,879)
Fixed maturities, Estimated Fair Value | 1,226,309 | 1,293,793
U.S. Treasuries |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fixed maturities, Amortized Cost | 547,350 | 497,099
Fixed maturities, Allowance for Expected Credit Losses | 0 | 0
Fixed maturities, Gross Unrealized Gains | 36 | 515
Fixed maturities, Gross Unrealized losses | (2,843) | (3,391)
Fixed maturities, Estimated Fair Value | 544,543 | 494,223
Obligations of States and Political Subdivisions |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fixed maturities, Amortized Cost | 24,280 | 27,326
Fixed maturities, Allowance for Expected Credit Losses | 0 | 0
Fixed maturities, Gross Unrealized Gains | 0 | 0
Fixed maturities, Gross Unrealized losses | (1,188) | (1,176)
Fixed maturities, Estimated Fair Value | 23,092 | 26,150
Mortgage Backed Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fixed maturities, Amortized Cost | 61,200 | 63,173
Fixed maturities, Allowance for Expected Credit Losses | 0 | 0
Fixed maturities, Gross Unrealized Gains | 486 | 229
Fixed maturities, Gross Unrealized losses | (4,144) | (4,475)
Fixed maturities, Estimated Fair Value | 57,542 | 58,927
Asset-backed Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fixed maturities, Amortized Cost | 203,449 | 207,375
Fixed maturities, Allowance for Expected Credit Losses | 0 | 0
Fixed maturities, Gross Unrealized Gains | 687 | 668
Fixed maturities, Gross Unrealized losses | (4,441) | (5,091)
Fixed maturities, Estimated Fair Value | 199,695 | 202,952
Commercial Mortgage-Backed Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fixed maturities, Amortized Cost | 82,027 | 84,062
Fixed maturities, Allowance for Expected Credit Losses | 0 | 0
Fixed maturities, Gross Unrealized Gains | 15 | 12
Fixed maturities, Gross Unrealized losses | (4,271) | (4,994)
Fixed maturities, Estimated Fair Value | 77,771 | 79,080
Corporate Bonds |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fixed maturities, Amortized Cost | 230,387 | 298,526
Fixed maturities, Allowance for Expected Credit Losses | 0 | 0
Fixed maturities, Gross Unrealized Gains | 168 | 116
Fixed maturities, Gross Unrealized losses | (5,891) | (6,929)
Fixed maturities, Estimated Fair Value | 224,664 | 291,713
Foreign Corporate Bonds |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fixed maturities, Amortized Cost | 102,282 | 144,531
Fixed maturities, Allowance for Expected Credit Losses | 0 | 0
Fixed maturities, Gross Unrealized Gains | 45 | 40
Fixed maturities, Gross Unrealized losses | (3,325) | (3,823)
Fixed maturities, Estimated Fair Value | $ 99,002 | $ 140,748

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