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Losses and Loss Adjustment Expenses - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]        
Unpaid claims and claim adjustment expenses overall development $ 4,626 $ 1,781 $ 10,558 $ 2,331