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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, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Insurance [Abstract]        
Balance at beginning of period $ 151,916 $ 22,645 $ 248,425 $ 58,494
Less: Reinsurance recoverable (net of payable offsets) (96,733) (1,393) (182,405) (106)
Net balance at beginning of period 55,183 21,252 66,020 58,388
Incurred (recovered) related to current year 85,986 116,262 249,488 265,811
Incurred (recovered) related to prior years (39) 113 2,227 1,318
Total incurred 85,947 116,375 251,715 267,129
Paid related to Current year 72,034 93,969 140,013 179,000
Paid related to Prior years 38,372 15,912 146,998 118,771
Total paid 110,406 109,881 287,011 297,771
Net balance at end of period 30,724 27,746 30,724 27,746
Plus: Reinsurance recoverable (net of payable offsets) 127,943 412,697 127,943 412,697
Balance at end of period $ 158,667 $ 440,443 $ 158,667 $ 440,443