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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, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Net Investment Income [Line Items]        
Total investment income $ 2,694 $ 1,690 $ 4,916 $ 3,035
Less: Investment expenses (552) (483) (1,169) (966)
Net investment (expense) income 2,142 1,207 3,747 2,069
Fixed Maturities [Member]        
Net Investment Income [Line Items]        
Investment income 2,160 1,338 3,992 2,522
Equity Securities [Member]        
Net Investment Income [Line Items]        
Investment income 239 206 442 263
Short-term Investments [Member]        
Net Investment Income [Line Items]        
Investment income 14 67 45 105
Other [Member]        
Net Investment Income [Line Items]        
Investment income $ 281 $ 79 $ 437 $ 145