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Loss and Loss Adjustment Expenses - Reconciliation of Beginning and Ending Reserve Balances, Net of Related Amounts Recoverable from Reinsurers (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Roll Forward In Liability For Unpaid Claims And Claims Adjustment Expense [Abstract]      
Balance, beginning of period $ 771,845 $ 742,776 $ 718,033
Less amounts recoverable from reinsurers on unpaid loss and loss adjustment expenses 84,889 78,256 64,858
Net balance, beginning of period 686,956 664,520 653,175
Add incurred related to:      
Current accident year 250,487 244,094 250,337
Prior accident years (45,596) (34,770) (51,306)
Total incurred 204,891 209,324 199,031
Less paid related to:      
Current accident year 62,061 56,951 52,085
Prior accident years 138,593 129,937 135,601
Total paid 200,654 186,888 187,686
Net balance, end of period 691,193 686,956 664,520
Add amounts recoverable from reinsurers on unpaid loss and loss adjustment expenses 107,216 84,889 78,256
Balance, end of period $ 798,409 $ 771,845 $ 742,776