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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, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Net Investment Income [Line Items]        
Total investment income $ 3,644 $ 2,860 $ 10,634 $ 7,776
Less: Investment expenses (559) (556) (1,622) (1,725)
Net investment (expense) income 3,085 2,304 9,012 6,051
Fixed Maturities [Member]        
Net Investment Income [Line Items]        
Investment income 2,977 2,456 8,893 6,447
Equity Securities [Member]        
Net Investment Income [Line Items]        
Investment income 348 223 1,068 666
Short-term Investments [Member]        
Net Investment Income [Line Items]        
Investment income   15 22 60
Other [Member]        
Net Investment Income [Line Items]        
Investment income $ 319 $ 166 $ 651 $ 603