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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, 2017
Dec. 31, 2016
Dec. 31, 2015
Insurance [Abstract]      
Balance at beginning of year $ 58,494 $ 98,840 $ 134,353
Less: Reinsurance recoverable (106) (13,540) (47,350)
Net balance at beginning of period 58,388 85,300 87,003
Incurred (recovered) related to current year 322,929 305,919 188,040
Incurred (recovered) related to prior years 27,499 (4,690) (301)
Total incurred 350,428 301,229 187,739
Paid related to Current year 215,274 229,761 123,952
Paid related to Prior years 127,522 98,380 65,490
Total paid 342,796 328,141 189,442
Net balance at end of period 66,020 58,388 85,300
Plus: Reinsurance recoverable 182,405 106 13,540
Balance at end of year $ 248,425 $ 58,494 $ 98,840