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Schedule of Investment Income (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Schedule Of Available For Sale Securities [Line Items]      
Investment income $ 64,438 $ 56,960 $ 29,776
Investment expense (2,063) (1,516) (2,149)
Net investment income 62,375 55,444 27,627
Fixed Income Securities      
Schedule Of Available For Sale Securities [Line Items]      
Investment income 58,675 49,987 33,852
Equity Securities      
Schedule Of Available For Sale Securities [Line Items]      
Investment income 784 917 1,100
Cash and Cash Equivalents      
Schedule Of Available For Sale Securities [Line Items]      
Investment income 2,838 1,593 790
Other Invested Assets      
Schedule Of Available For Sale Securities [Line Items]      
Investment income $ 2,141 $ 4,463 $ (5,966)