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Schedule of Investment Income (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Investment income | $ 18,415 | $ 16,993 | $ 48,908 | $ 47,839
Investment expense | (504) | (505) | (1,508) | (1,520)
Net investment income | 17,911 | 16,488 | 47,400 | 46,319
Fixed Income Securities |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Investment income | 14,972 | 15,457 | 44,268 | 43,617
Equity Securities |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Investment income | 716 | 181 | 1,001 | 615
Cash and Cash Equivalents |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Investment income | 715 | 800 | 2,321 | 2,121
Other Invested Assets |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Investment income | $ 2,012 | $ 555 | $ 1,318 | $ 1,486

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