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Summarized Activity in Liability for Unpaid Losses and Loss Adjustment Expenses (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Insurance [Abstract]    
Balance at beginning of period $ 850,599 $ 832,404
Less: Ceded reinsurance receivables 72,829 73,021
Net balance at beginning of period 777,770 759,383
Incurred losses and loss adjustment expenses related to:    
Current year 5,597 9,617
Prior years 1 0
Total incurred losses and loss adjustment expenses 53,384 88,001
Paid losses and loss adjustment expenses related to:    
Current year 53,383 88,001
Prior years 43,769 53,912
Total paid losses and loss adjustment expenses 49,366 63,529
Net balance at end of period 781,788 783,855
Plus: Ceded reinsurance receivables 71,814 73,665
Balance at end of period $ 853,602 $ 857,520