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Investments - Investment Income (Expense) Comprised Primarily of Interest and Dividends (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Net Investment Income [Line Items]    
Total investment income $ 11,267 $ 4,752
Less: Investment expenses (569) (710)
Net investment income 10,698 4,042
Available-for-sale debt securities    
Net Investment Income [Line Items]    
Investment income 5,870 4,067
Equity securities    
Net Investment Income [Line Items]    
Investment income 1,053 535
Cash and cash equivalents    
Net Investment Income [Line Items]    
Investment income 4,203 22
Other    
Net Investment Income [Line Items]    
Investment income $ 141 $ 128