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Schedule of Investment Income (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Schedule Of Available For Sale Securities [Line Items]        
Investment income $ 16,993 $ 14,566 $ 47,839 $ 40,513
Investment expense (505) (366) (1,520) (1,089)
Net investment income 16,488 14,200 46,319 39,424
Fixed Income Securities        
Schedule Of Available For Sale Securities [Line Items]        
Investment income 15,457 12,961 43,617 36,734
Equity Securities        
Schedule Of Available For Sale Securities [Line Items]        
Investment income 181 188 615 635
Cash and Cash Equivalents        
Schedule Of Available For Sale Securities [Line Items]        
Investment income 800 501 2,121 1,064
Other Invested Assets        
Schedule Of Available For Sale Securities [Line Items]        
Investment income $ 555 $ 916 $ 1,486 $ 2,080