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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, 2024
Dec. 31, 2023
Dec. 31, 2022
Liability for Unpaid Claims and Claims Adjustment Expense, Activity in Liability [Abstract]      
Balance, beginning of period $ 673,994 $ 696,037 $ 745,278
Less amounts recoverable from reinsurers on unpaid loss and loss adjustment expenses 119,746 112,555 119,266
Net balance, beginning of period 554,248 583,482 626,012
Add incurred related to:      
Current accident year 192,153 189,659 192,907
Prior accident years (34,886) (41,396) (40,591)
Total incurred 157,267 148,263 152,316
Less paid related to:      
Current accident year 52,869 47,207 50,954
Prior accident years 120,079 130,290 143,892
Total paid 172,948 177,497 194,846
Net balance, end of period 538,567 554,248 583,482
Add amounts recoverable from reinsurers on unpaid loss and loss adjustment expenses 112,742 119,746 112,555
Balance, end of period $ 651,309 $ 673,994 $ 696,037