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Schedule of Investment Income (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Schedule Of Available For Sale Securities [Line Items]    
Investment income $ 15,023 $ 12,380
Investment expense (503) (372)
Net investment income 14,520 12,008
Fixed Income Securities    
Schedule Of Available For Sale Securities [Line Items]    
Investment income 13,578 11,460
Equity Securities    
Schedule Of Available For Sale Securities [Line Items]    
Investment income 189 190
Cash and Cash Equivalents    
Schedule Of Available For Sale Securities [Line Items]    
Investment income 659 263
Other Invested Assets    
Schedule Of Available For Sale Securities [Line Items]    
Investment income $ 597 $ 467