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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 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Insurance [Abstract]        
Balance at beginning of period $ 22,645 $ 60,144 $ 58,494 $ 98,840
Less: Reinsurance recoverable (1,393) (2,958) (106) (13,540)
Net balance at beginning of period 21,252 57,186 58,388 85,300
Incurred (recovered) related to current year 116,262 73,721 265,811 199,907
Incurred (recovered) related to prior years 113 (173) 1,318 (158)
Total incurred 116,375 73,548 267,129 199,749
Paid related to Current year 93,969 73,352 179,000 146,012
Paid related to Prior years 15,912 5,077 118,771 86,732
Total paid 109,881 78,429 297,771 232,744
Net balance at end of period 27,746 52,305 27,746 52,305
Plus: Reinsurance recoverable 412,697 1,904 412,697 1,904
Balance at end of period $ 440,443 $ 54,209 $ 440,443 $ 54,209