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Summary of Securities with Gross Unrealized Losses (Detail) - Fixed Income Securities - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Schedule Of Available For Sale Securities [Line Items] |  |
Less than 12 months, Fair Value | $ 382,597 | $ 148,474
Less than 12 months, Gross Unrealized Losses | (1,408) | (1,496)
12 months or longer, Fair Value | 596,865 | 834,118
12 months or longer, Gross Unrealized Losses | (24,695) | (28,383)
Total, Fair Value | 979,462 | 982,592
Total, Gross Unrealized Losses | (26,103) | (29,879)
U.S. Treasuries |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less than 12 months, Fair Value | 301,942 | 55,447
Less than 12 months, Gross Unrealized Losses | (816) | (342)
12 months or longer, Fair Value | 148,120 | 239,254
12 months or longer, Gross Unrealized Losses | (2,027) | (3,049)
Total, Fair Value | 450,062 | 294,701
Total, Gross Unrealized Losses | (2,843) | (3,391)
Obligations of States and Political Subdivisions |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less than 12 months, Fair Value | 0 | 0
Less than 12 months, Gross Unrealized Losses | 0 | 0
12 months or longer, Fair Value | 20,092 | 26,150
12 months or longer, Gross Unrealized Losses | (1,188) | (1,176)
Total, Fair Value | 20,092 | 26,150
Total, Gross Unrealized Losses | (1,188) | (1,176)
Mortgage Backed Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less than 12 months, Fair Value | 5,770 | 12,432
Less than 12 months, Gross Unrealized Losses | (67) | (406)
12 months or longer, Fair Value | 37,528 | 39,734
12 months or longer, Gross Unrealized Losses | (4,077) | (4,069)
Total, Fair Value | 43,298 | 52,166
Total, Gross Unrealized Losses | (4,144) | (4,475)
Asset-backed Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less than 12 months, Fair Value | 46,385 | 38,828
Less than 12 months, Gross Unrealized Losses | (474) | (469)
12 months or longer, Fair Value | 84,010 | 108,947
12 months or longer, Gross Unrealized Losses | (3,967) | (4,622)
Total, Fair Value | 130,395 | 147,775
Total, Gross Unrealized Losses | (4,441) | (5,091)
Commercial Mortgage-Backed Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less than 12 months, Fair Value | 0 | 13
Less than 12 months, Gross Unrealized Losses | 0 | (2)
12 months or longer, Fair Value | 75,207 | 76,467
12 months or longer, Gross Unrealized Losses | (4,271) | (4,992)
Total, Fair Value | 75,207 | 76,480
Total, Gross Unrealized Losses | (4,271) | (4,994)
Corporate Bonds |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less than 12 months, Fair Value | 23,798 | 34,658
Less than 12 months, Gross Unrealized Losses | (45) | (264)
12 months or longer, Fair Value | 150,118 | 231,816
12 months or longer, Gross Unrealized Losses | (5,846) | (6,665)
Total, Fair Value | 173,916 | 266,474
Total, Gross Unrealized Losses | (5,891) | (6,929)
Foreign Corporate Bonds |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less than 12 months, Fair Value | 4,702 | 7,096
Less than 12 months, Gross Unrealized Losses | (6) | (13)
12 months or longer, Fair Value | 81,790 | 111,750
12 months or longer, Gross Unrealized Losses | (3,319) | (3,810)
Total, Fair Value | 86,492 | 118,846
Total, Gross Unrealized Losses | $ (3,325) | $ (3,823)

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