Losses and Loss Adjustment Expenses - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Unpaid claims and claim adjustment expenses overall development	$ 5,469	$ 343	$ 5,932	$ 550