v3.26.1
Summarized Activity in Liability for Unpaid Losses and Loss Adjustment Expenses (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Insurance [Abstract]        
Balance at beginning of period $ 747,143 $ 794,848 $ 750,191 $ 800,391
Less: ceded reinsurance receivables 62,789 62,731 60,898 60,754
Net balance at beginning of period 684,354 732,117 689,293 739,637
Net losses and loss adjustment expenses related to:        
Current year 53,047 52,946 106,908 119,681
Prior years 0 2 0 5
Total net losses and loss adjustment expenses 53,047 52,948 106,908 119,686
Paid net losses and loss adjustment expenses related to:        
Current year 8,971 15,785 19,462 33,776
Prior years 71,490 52,631 119,799 108,898
Total paid net losses and loss adjustment expenses 80,461 68,416 139,261 142,674
Net balance at end of period 656,940 716,649 656,940 716,649
Plus: ceded reinsurance receivables 61,575 59,478 61,575 59,478
Balance at end of period $ 718,515 $ 776,127 $ 718,515 $ 776,127