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Schedule of Investment Income (Detail) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Schedule Of Available For Sale Securities [Line Items] |  |
Investment income | $ 15,023 | $ 12,380
Investment expense | (503) | (372)
Net investment income | 14,520 | 12,008
Fixed Income Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Investment income | 13,578 | 11,460
Equity Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Investment income | 189 | 190
Cash and Cash Equivalents |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Investment income | 659 | 263
Other Invested Assets |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Investment income | $ 597 | $ 467

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