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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, 2016
Dec. 31, 2015
Dec. 31, 2014
Insurance [Abstract]      
Balance at beginning of year $ 98,840 $ 134,353 $ 159,222
Less: Reinsurance recoverable (13,540) (47,350) (68,584)
Net balance at beginning of period 85,300 87,003 90,638
Incurred (recovered) related to current year 305,919 188,040 124,011
Incurred (recovered) related to prior years (4,690) (301) (736)
Total incurred 301,229 187,739 123,275
Paid related to Current year 229,761 123,952 73,981
Paid related to Prior years 98,380 65,490 52,929
Total paid 328,141 189,442 126,910
Net balance at end of period 58,388 85,300 87,003
Plus: Reinsurance recoverable 106 13,540 47,350
Balance at end of year $ 58,494 $ 98,840 $ 134,353