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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, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Insurance [Abstract]        
Balance at beginning of period $ 844,206 $ 866,951 $ 850,599 $ 832,404
Less: ceded reinsurance receivables 70,392 73,933 72,829 73,021
Net balance at beginning of period 773,814 793,018 777,770 759,383
Incurred losses and loss adjustment expenses related to:        
Current year 52,434 65,167 159,561 231,199
Prior years (34) (51) (115) 0
Total incurred losses and loss adjustment expenses 52,400 65,116 159,446 231,199
Paid losses and loss adjustment expenses related to:        
Current year 8,415 20,990 32,501 55,174
Prior years 48,520 50,361 135,436 148,625
Total paid losses and loss adjustment expenses 56,935 71,351 167,937 203,799
Net balance at end of period 769,279 786,783 769,279 786,783
Plus: ceded reinsurance receivables 70,897 75,020 70,897 75,020
Balance at end of period $ 840,176 $ 861,803 $ 840,176 $ 861,803