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Schedule of Investment Income (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Investment income | $ 13,567 | $ 2,541 | $ 25,947 | $ 9,737
Investment expense | (351) | (611) | (723) | (1,215)
Net investment income | 13,216 | 1,930 | 25,224 | 8,522
Fixed Income Securities |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Investment income | 12,313 | 7,467 | 23,773 | 13,871
Equity Securities |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Investment income | 257 | 275 | 447 | 609
Cash and Cash Equivalents |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Investment income | 300 | 99 | 563 | 131
Other Invested Assets |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Investment income | $ 697 | $ (5,300) | $ 1,164 | $ (4,874)

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