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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, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Insurance [Abstract]        
Balance at beginning of period $ 866,951 $ 804,661 $ 832,404 $ 759,904
Less: Ceded reinsurance receivables 73,933 94,185 73,021 94,443
Net balance at beginning of period 793,018 710,476 759,383 665,461
Incurred losses and loss adjustment expenses related to:        
Current year 65,167 91,451 231,199 275,398
Prior years (51) (2,992) 0 (9,626)
Total incurred losses and loss adjustment expenses 65,116 88,459 231,199 265,772
Paid losses and loss adjustment expenses related to:        
Current year 20,990 33,972 55,174 76,366
Prior years 50,361 35,282 148,625 125,186
Total paid losses and loss adjustment expenses 71,351 69,254 203,799 201,552
Net balance at end of period 786,783 729,681 786,783 729,681
Plus: Ceded reinsurance receivables 75,020 95,913 75,020 95,913
Balance at end of period $ 861,803 $ 825,594 $ 861,803 $ 825,594