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Summarized Activity in Liability for Unpaid Losses and Loss Adjustment Expenses (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Insurance [Abstract]        
Balance at beginning of period $ 776,127 $ 844,206 $ 800,391 $ 850,599
Less: ceded reinsurance receivables 59,478 70,392 60,754 72,829
Net balance at beginning of period 716,649 773,814 739,637 777,770
Net losses and loss adjustment expenses related to:        
Current year 49,919 52,434 169,600 159,561
Prior years (44) (34) (39) (115)
Total net losses and loss adjustment expenses 49,875 52,400 169,561 159,446
Paid net losses and loss adjustment expenses related to:        
Current year 13,208 8,415 46,984 32,501
Prior years 50,425 48,520 159,323 135,436
Total paid net losses and loss adjustment expenses 63,633 56,935 206,307 167,937
Net balance at end of period 702,891 769,279 702,891 769,279
Plus: ceded reinsurance receivables 58,790 70,897 58,790 70,897
Balance at end of period $ 761,681 $ 840,176 $ 761,681 $ 840,176