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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, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Net Investment Income [Line Items]        
Total investment income $ 2,860 $ 1,947 $ 7,776 $ 4,982
Less: Investment expenses (556) (640) (1,725) (1,606)
Net investment (expense) income 2,304 1,307 6,051 3,376
Fixed Maturities [Member]        
Net Investment Income [Line Items]        
Investment income 2,456 1,479 6,447 4,001
Equity Securities [Member]        
Net Investment Income [Line Items]        
Investment income 223 277 666 540
Short-term Investments [Member]        
Net Investment Income [Line Items]        
Investment income 15 89 60 194
Other [Member]        
Net Investment Income [Line Items]        
Investment income $ 166 $ 102 $ 603 $ 247