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Summary of Securities with Gross Unrealized Losses (Detail) - Fixed Income Securities - USD ($) $ in Thousands | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Schedule Of Available For Sale Securities [Line Items] |  |
Less than 12 months, Fair Value | $ 588,383 | $ 148,474
Less than 12 months, Gross Unrealized Losses | (1,045) | (1,496)
12 months or longer, Fair Value | 544,052 | 834,118
12 months or longer, Gross Unrealized Losses | (22,699) | (28,383)
Total, Fair Value | 1,132,435 | 982,592
Total, Gross Unrealized Losses | (23,744) | (29,879)
U.S. Treasuries |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less than 12 months, Fair Value | 549,749 | 55,447
Less than 12 months, Gross Unrealized Losses | (719) | (342)
12 months or longer, Fair Value | 149,715 | 239,254
12 months or longer, Gross Unrealized Losses | (1,866) | (3,049)
Total, Fair Value | 699,464 | 294,701
Total, Gross Unrealized Losses | (2,585) | (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 | 19,381 | 26,150
12 months or longer, Gross Unrealized Losses | (1,068) | (1,176)
Total, Fair Value | 19,381 | 26,150
Total, Gross Unrealized Losses | (1,068) | (1,176)
Mortgage Backed Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less than 12 months, Fair Value | 6,072 | 12,432
Less than 12 months, Gross Unrealized Losses | (97) | (406)
12 months or longer, Fair Value | 34,795 | 39,734
12 months or longer, Gross Unrealized Losses | (3,875) | (4,069)
Total, Fair Value | 40,867 | 52,166
Total, Gross Unrealized Losses | (3,972) | (4,475)
Asset-backed Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less than 12 months, Fair Value | 19,742 | 38,828
Less than 12 months, Gross Unrealized Losses | (168) | (469)
12 months or longer, Fair Value | 80,809 | 108,947
12 months or longer, Gross Unrealized Losses | (3,582) | (4,622)
Total, Fair Value | 100,551 | 147,775
Total, Gross Unrealized Losses | (3,750) | (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 | 70,298 | 76,467
12 months or longer, Gross Unrealized Losses | (4,159) | (4,992)
Total, Fair Value | 70,298 | 76,480
Total, Gross Unrealized Losses | (4,159) | (4,994)
Corporate Bonds |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less than 12 months, Fair Value | 8,827 | 34,658
Less than 12 months, Gross Unrealized Losses | (54) | (264)
12 months or longer, Fair Value | 128,858 | 231,816
12 months or longer, Gross Unrealized Losses | (5,098) | (6,665)
Total, Fair Value | 137,685 | 266,474
Total, Gross Unrealized Losses | (5,152) | (6,929)
Foreign Corporate Bonds |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less than 12 months, Fair Value | 3,993 | 7,096
Less than 12 months, Gross Unrealized Losses | (7) | (13)
12 months or longer, Fair Value | 60,196 | 111,750
12 months or longer, Gross Unrealized Losses | (3,051) | (3,810)
Total, Fair Value | 64,189 | 118,846
Total, Gross Unrealized Losses | $ (3,058) | $ (3,823)

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