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Loss Reserves - Liability for Unpaid Loss and Loss Adjustment Expenses, Net of Related Amounts Recoverable from Reinsurers (Detail) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Roll Forward In Liability For Unpaid Claims And Claims Adjustment Expense [Abstract]    
Balance, beginning of period $ 771,845 $ 742,776
Less amounts recoverable from reinsurers on unpaid loss and loss adjustment expenses 84,889 78,256
Net balance, beginning of period 686,956 664,520
Add incurred related to:    
Current accident year 186,964 178,562
Prior accident years (34,128) (27,524)
Total incurred 152,836 151,038
Less paid related to:    
Current accident year 37,901 31,749
Prior accident years 115,194 108,284
Total paid 153,095 140,033
Net balance, end of period 686,697 675,525
Add amounts recoverable from reinsurers on unpaid loss and loss adjustment expenses 104,432 79,501
Balance, end of period $ 791,129 $ 755,026