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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, 2019
Sep. 30, 2018
Roll Forward In Liability For Unpaid Claims And Claims Adjustment Expense [Abstract]    
Balance, beginning of period $ 798,409 $ 771,845
Less amounts recoverable from reinsurers on unpaid loss and loss adjustment expenses 107,216 84,889
Net balance, beginning of period 691,193 686,956
Add incurred related to:    
Current accident year 181,693 186,964
Prior accident years (38,886) (34,128)
Total incurred 142,807 152,836
Less paid related to:    
Current accident year 35,512 37,901
Prior accident years 105,590 115,194
Total paid 141,102 153,095
Net balance, end of period 692,898 686,697
Add amounts recoverable from reinsurers on unpaid loss and loss adjustment expenses 97,914 104,432
Balance, end of period $ 790,812 $ 791,129