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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, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Net Investment Income [Line Items]        
Total investment income $ 6,975 $ 8,247 $ 14,580 $ 16,999
Less: Investment expenses (796) (837) (1,567) (1,447)
Net investment income 6,179 7,410 13,013 15,552
Debt Securities [Member]        
Net Investment Income [Line Items]        
Investment income 6,016 6,041 12,031 12,192
Equity Securities [Member]        
Net Investment Income [Line Items]        
Investment income 604 562 1,149 1,604
Cash and Cash Equivalents [Member]        
Net Investment Income [Line Items]        
Investment income 95 1,392 886 2,692
Other [Member]        
Net Investment Income [Line Items]        
Investment income $ 260 $ 252 $ 514 $ 511