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Summarized Activity in Liability for Unpaid Losses and Loss Adjustment Expenses (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Insurance [Abstract]    
Balance at beginning of period $ 832,404 $ 759,904
Less: Ceded reinsurance receivables 73,021 94,443
Net balance at beginning of period 759,383 665,461
Incurred losses and loss adjustment expenses related to:    
Current year 88,001 87,758
Prior years 0 (3,063)
Total incurred losses and loss adjustment expenses 88,001 84,695
Paid losses and loss adjustment expenses related to:    
Current year 9,617 13,315
Prior years 53,912 59,703
Total paid losses and loss adjustment expenses 63,529 73,018
Net balance at end of period 783,855 677,138
Plus: Ceded reinsurance receivables 73,665 93,194
Balance at end of period $ 857,520 $ 770,332