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Investments - Investment Income (Expense) Comprised Primarily of Interest and Dividends (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Net Investment Income [Line Items]        
Total investment income $ 8,420 $ 7,423 $ 25,419 $ 19,316
Less: Investment expenses (807) (781) (2,254) (2,103)
Net investment income 7,613 6,642 23,165 17,213
Debt Securities [Member]        
Net Investment Income [Line Items]        
Investment income 6,316 4,595 18,508 12,390
Equity Securities [Member]        
Net Investment Income [Line Items]        
Investment income 487 722 2,091 2,016
Short-term Investments [Member]        
Net Investment Income [Line Items]        
Investment income 0 0 0 145
Cash and Cash Equivalents [Member]        
Net Investment Income [Line Items]        
Investment income 1,374 1,854 4,066 4,100
Other [Member]        
Net Investment Income [Line Items]        
Investment income $ 243 $ 252 $ 754 $ 665