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Summary of Securities with Gross Unrealized Losses (Detail) - Fixed Income Securities - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Schedule Of Available For Sale Securities [Line Items] |  |
Less than 12 months, Fair Value | $ 35,766 | $ 148,474
Less than 12 months, Gross Unrealized Losses | (198) | (1,496)
12 months or longer, Fair Value | 386,934 | 834,118
12 months or longer, Gross Unrealized Losses | (13,274) | (28,383)
Total, Fair Value | 422,700 | 982,592
Total, Gross Unrealized Losses | (13,472) | (29,879)
U.S. Treasuries |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less than 12 months, Fair Value | 18,829 | 55,447
Less than 12 months, Gross Unrealized Losses | (4) | (342)
12 months or longer, Fair Value | 67,499 | 239,254
12 months or longer, Gross Unrealized Losses | (679) | (3,049)
Total, Fair Value | 86,328 | 294,701
Total, Gross Unrealized Losses | (683) | (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 | 17,173 | 26,150
12 months or longer, Gross Unrealized Losses | (634) | (1,176)
Total, Fair Value | 17,173 | 26,150
Total, Gross Unrealized Losses | (634) | (1,176)
Mortgage Backed Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less than 12 months, Fair Value | 6,235 | 12,432
Less than 12 months, Gross Unrealized Losses | (127) | (406)
12 months or longer, Fair Value | 24,167 | 39,734
12 months or longer, Gross Unrealized Losses | (2,311) | (4,069)
Total, Fair Value | 30,402 | 52,166
Total, Gross Unrealized Losses | (2,438) | (4,475)
Asset-backed Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less than 12 months, Fair Value | 4,130 | 38,828
Less than 12 months, Gross Unrealized Losses | (49) | (469)
12 months or longer, Fair Value | 56,171 | 108,947
12 months or longer, Gross Unrealized Losses | (2,761) | (4,622)
Total, Fair Value | 60,301 | 147,775
Total, Gross Unrealized Losses | (2,810) | (5,091)
Commercial Mortgage-Backed Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less than 12 months, Fair Value | 9 | 13
Less than 12 months, Gross Unrealized Losses | 0 | (2)
12 months or longer, Fair Value | 65,051 | 76,467
12 months or longer, Gross Unrealized Losses | (2,526) | (4,992)
Total, Fair Value | 65,060 | 76,480
Total, Gross Unrealized Losses | (2,526) | (4,994)
Corporate Bonds |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less than 12 months, Fair Value | 6,043 | 34,658
Less than 12 months, Gross Unrealized Losses | (11) | (264)
12 months or longer, Fair Value | 106,762 | 231,816
12 months or longer, Gross Unrealized Losses | (2,766) | (6,665)
Total, Fair Value | 112,805 | 266,474
Total, Gross Unrealized Losses | (2,777) | (6,929)
Foreign Corporate Bonds |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less than 12 months, Fair Value | 520 | 7,096
Less than 12 months, Gross Unrealized Losses | (7) | (13)
12 months or longer, Fair Value | 50,111 | 111,750
12 months or longer, Gross Unrealized Losses | (1,597) | (3,810)
Total, Fair Value | 50,631 | 118,846
Total, Gross Unrealized Losses | $ (1,604) | $ (3,823)

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