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Investments - Investment Income (Expense) Comprised Primarily of Interest and Dividends (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Net Investment Income [Line Items]    
Total investment income $ 4,752 $ 3,699
Less: Investment expenses (710) (713)
Net investment income 4,042 2,986
Available-for-sale debt securities    
Net Investment Income [Line Items]    
Investment income 4,067 2,829
Equity securities    
Net Investment Income [Line Items]    
Investment income 535 591
Cash and Cash Equivalents    
Net Investment Income [Line Items]    
Investment income 22 11
Other    
Net Investment Income [Line Items]    
Investment income $ 128 $ 268