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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, 2018
Mar. 31, 2017
Insurance [Abstract]    
Balance at beginning of period $ 248,425 $ 58,494
Less: Reinsurance recoverable (182,405) (106)
Net balance at beginning of period 66,020 58,388
Incurred (recovered) related to current year 75,970 70,474
Incurred (recovered) related to prior years (44) 96
Total incurred 75,926 70,570
Paid related to Current year 17,407 22,890
Paid related to Prior years 65,253 72,252
Total paid 82,660 95,142
Net balance at end of period 59,286 33,816
Plus: Reinsurance recoverable/(payable) 70,351 (2,353)
Balance at end of period $ 129,637 $ 31,463