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Liability for Unpaid Losses and Loss Adjustment Expenses - Change in Liability for Unpaid Losses and LAE (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Insurance [Abstract]    
Balance at beginning of period $ 58,494 $ 98,840
Less: Reinsurance recoverable (106) (13,540)
Net balance at beginning of period 58,388 85,300
Incurred (recovered) related to current year 70,474 66,101
Incurred (recovered) related to prior years 96 16
Total incurred 70,570 66,117
Paid related to Current year 22,890 18,618
Paid related to Prior years 72,252 55,533
Total paid 95,142 74,151
Net balance at end of period 33,816 77,266
Plus: Reinsurance recoverable (payable) (2,353) 7,709
Balance at end of period $ 31,463 $ 84,975