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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, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Insurance [Abstract]        
Balance at beginning of period $ 857,520 $ 770,332 $ 832,404 $ 759,904
Less: Ceded reinsurance receivables 73,665 93,194 73,021 94,443
Net balance at beginning of period 783,855 677,138 759,383 665,461
Incurred losses and loss adjustment expenses related to:        
Current year 78,031 96,189 166,032 183,947
Prior years 51 (3,571) 51 (6,634)
Total incurred losses and loss adjustment expenses 78,082 92,618 166,083 177,313
Paid losses and loss adjustment expenses related to:        
Current year 24,565 29,079 34,184 42,394
Prior years 44,354 30,201 98,264 89,904
Total paid losses and loss adjustment expenses 68,919 59,280 132,448 132,298
Net balance at end of period 793,018 710,476 793,018 710,476
Plus: Ceded reinsurance receivables 73,933 94,185 73,933 94,185
Balance at end of period $ 866,951 $ 804,661 $ 866,951 $ 804,661