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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, 2024
Sep. 30, 2023
Liability for Unpaid Claims and Claims Adjustment Expense, Activity in Liability [Abstract]    
Balance, beginning of period $ 673,994 $ 696,037
Less amounts recoverable from reinsurers on unpaid loss and loss adjustment expenses 119,746 112,555
Net balance, beginning of period 554,248 583,482
Add incurred related to:    
Current accident year 144,931 143,003
Prior accident years (25,166) (31,195)
Total incurred 119,765 111,808
Less paid related to:    
Current accident year 29,872 28,074
Prior accident years 102,082 104,602
Total paid 131,954 132,676
Net balance, end of period 542,059 562,614
Add amounts recoverable from reinsurers on unpaid loss and loss adjustment expenses 121,427 121,734
Balance, end of period $ 663,486 $ 684,348