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Losses and Loss Adjustment Expenses - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]      
Unpaid claims and claim adjustment expenses overall development $ 20,539 $ 8,899 $ 3,658