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Schedule of Investment Income (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Investment income | $ 16,993 | $ 14,566 | $ 47,839 | $ 40,513
Investment expense | (505) | (366) | (1,520) | (1,089)
Net investment income | 16,488 | 14,200 | 46,319 | 39,424
Fixed Income Securities |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Investment income | 15,457 | 12,961 | 43,617 | 36,734
Equity Securities |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Investment income | 181 | 188 | 615 | 635
Cash and Cash Equivalents |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Investment income | 800 | 501 | 2,121 | 1,064
Other Invested Assets |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Investment income | $ 555 | $ 916 | $ 1,486 | $ 2,080

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