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Schedule of Investment Income (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024
Schedule Of Available For Sale Securities [Line Items] |  |
Investment income | $ 15,273 | $ 15,023
Investment expense | (491) | (503)
Net investment income | 14,782 | 14,520
Fixed Income Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Investment income | 14,387 | 13,578
Equity Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Investment income | 116 | 189
Cash and Cash Equivalents |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Investment income | 856 | 659
Other Invested Assets |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Investment income | $ (86) | $ 597

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