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Schedule of Investment Income (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Investment income | $ 15,220 | $ 15,823 | $ 30,493 | $ 30,846
Investment expense | (513) | (512) | (1,004) | (1,015)
Net investment income | 14,707 | 15,311 | 29,489 | 29,831
Fixed Income Securities |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Investment income | 14,909 | 14,582 | 29,296 | 28,160
Equity Securities |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Investment income | 169 | 245 | 285 | 434
Cash and Cash Equivalents |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Investment income | 750 | 662 | 1,606 | 1,321
Other Invested Assets |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Investment income | $ (608) | $ 334 | $ (694) | $ 931

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