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Schedule of Investment Income (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Investment income | $ 14,566 | $ 8,856 | $ 40,513 | $ 18,593
Investment expense | (366) | (467) | (1,089) | (1,682)
Net investment income | 14,200 | 8,389 | 39,424 | 16,911
Fixed Income Securities |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Investment income | 12,961 | 9,595 | 36,734 | 23,466
Equity Securities |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Investment income | 188 | 233 | 635 | 842
Cash and Cash Equivalents |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Investment income | 501 | 89 | 1,064 | 220
Other Invested Assets |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Investment income | $ 916 | $ (1,061) | $ 2,080 | $ (5,935)

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