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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
 3 Months Ended
Mar. 31, 2019
Mar. 31, 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 61,587 62,426
Prior accident years (11,974) (9,264)
Total incurred 49,613 53,162
Less paid related to:    
Current accident year 3,381 4,686
Prior accident years 43,180 47,354
Total paid 46,561 52,040
Net balance, end of period 694,245 688,078
Add amounts recoverable from reinsurers on unpaid loss and loss adjustment expenses 106,335 89,220
Balance, end of period $ 800,580 $ 777,298