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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 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Insurance [Abstract]        
Balance at beginning of period $ 31,463 $ 84,975 $ 58,494 $ 98,840
Less: Reinsurance (recoverable) payable 2,353 (7,709) (106) (13,540)
Net balance at beginning of period 33,816 77,266 58,388 85,300
Incurred (recovered) related to current year 79,075 60,084 149,549 126,185
Incurred (recovered) related to prior years 1,109 (1) 1,205 15
Total incurred 80,184 60,083 150,754 126,200
Paid related to Current year 62,141 54,041 85,031 72,659
Paid related to Prior years 30,607 26,122 102,859 81,655
Total paid 92,748 80,163 187,890 154,314
Net balance at end of period 21,252 57,186 21,252 57,186
Plus: Reinsurance recoverable 1,393 2,958 1,393 2,958
Balance at end of period $ 22,645 $ 60,144 $ 22,645 $ 60,144