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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, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Insurance [Abstract]        
Balance at beginning of period $ 651,073 $ 608,773 $ 630,181 $ 680,031
Less: Ceded reinsurance receivables 87,221 59,834 76,273 109,342
Net balance at beginning of period 563,852 548,939 553,908 570,689
Incurred losses and loss adjustment expenses related to:        
Current year 108,859 80,533 273,709 225,022
Prior years (11,711) (6,950) (31,617) (23,043)
Total incurred losses and loss adjustment expenses 97,148 73,583 242,092 201,979
Paid losses and loss adjustment expenses related to:        
Current year 60,114 47,290 119,541 102,806
Prior years 29,612 20,789 105,185 115,419
Total paid losses and loss adjustment expenses 89,726 68,079 224,726 218,225
Net balance at end of period 571,274 554,443 571,274 554,443
Plus: Ceded reinsurance receivables 98,656 78,844 98,656 78,844
Balance at end of period $ 669,930 $ 633,287 $ 669,930 $ 633,287