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Investments - Investment Income (Expense) Comprised Primarily of Interest and Dividends (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Net Investment Income [Line Items]    
Total investment income $ 3,699 $ 7,605
Less: Investment expenses (713) (771)
Net investment income 2,986 6,834
Available-for-sale debt securities    
Net Investment Income [Line Items]    
Investment income 2,829 6,015
Equity securities    
Net Investment Income [Line Items]    
Investment income 591 545
Cash and Cash Equivalents    
Net Investment Income [Line Items]    
Investment income 11 791
Other    
Net Investment Income [Line Items]    
Investment income $ 268 $ 254