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Liability for Unpaid Losses and Loss Adjustment Expenses - Change in Liability for Unpaid Losses and LAE (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Insurance [Abstract]      
Balance at beginning of year $ 248,425 $ 58,494 $ 98,840
Less: Reinsurance recoverable (182,405) (106) (13,540)
Net balance at beginning of period 66,020 58,388 85,300
Incurred (recovered) related to current year 314,933 322,929 305,919
Incurred (recovered) related to prior years 99,522 27,499 (4,690)
Total incurred 414,455 350,428 301,229
Paid related to Current year 221,708 215,274 229,761
Paid related to Prior years 179,303 127,522 98,380
Total paid 401,011 342,796 328,141
Net balance at end of period 79,464 66,020 58,388
Plus: Reinsurance recoverable 393,365 182,405 106
Balance at end of year $ 472,829 $ 248,425 $ 58,494