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Summarized Activity in Liability for Unpaid Losses and Loss Adjustment Expenses (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Insurance [Abstract]        
Balance at beginning of period $ 853,602 $ 857,520 $ 850,599 $ 832,404
Less: Ceded reinsurance receivables 71,814 73,665 72,829 73,021
Net balance at beginning of period 781,788 783,855 777,770 759,383
Incurred losses and loss adjustment expenses related to:        
Current year 53,744 78,031 107,127 166,032
Prior years (82) 51 (81) 51
Total incurred losses and loss adjustment expenses 53,662 78,082 107,046 166,083
Paid losses and loss adjustment expenses related to:        
Current year 18,489 24,565 24,086 34,184
Prior years 43,147 44,354 86,916 98,264
Total paid losses and loss adjustment expenses 61,636 68,919 111,002 132,448
Net balance at end of period 773,814 793,018 773,814 793,018
Plus: Ceded reinsurance receivables 70,392 73,933 70,392 73,933
Balance at end of period $ 844,206 $ 866,951 $ 844,206 $ 866,951