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Investments - Investment Income (Expense) Comprised Primarily of Interest and Dividends (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Net Investment Income [Line Items]        
Total investment income $ 3,699 $ 6,975 $ 7,398 $ 14,580
Less: Investment expenses (841) (796) (1,554) (1,567)
Net investment income 2,858 6,179 5,844 13,013
Available-for-sale debt securities        
Net Investment Income [Line Items]        
Investment income 2,765 6,016 5,594 12,031
Equity securities        
Net Investment Income [Line Items]        
Investment income 652 604 1,243 1,149
Cash and Cash Equivalents        
Net Investment Income [Line Items]        
Investment income 15 95 26 886
Other        
Net Investment Income [Line Items]        
Investment income $ 267 $ 260 $ 535 $ 514