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Summarized Activity in Liability for Unpaid Losses and Loss Adjustment Expenses (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Insurance [Abstract]      
Balance at beginning of period $ 759,904 $ 662,811 $ 630,181
Less: Ceded reinsurance receivables 94,443 82,158 76,273
Net balance at beginning of period 665,461 580,653 553,908
Incurred losses and loss adjustment expenses related to:      
Current year 367,298 376,306 367,739
Prior years (8,070) 8,658 (31,538)
Total incurred losses and loss adjustment expenses 359,228 384,964 336,201
Paid losses and loss adjustment expenses related to:      
Current year 103,442 149,092 183,109
Prior years 161,864 151,064 126,347
Total paid losses and loss adjustment expenses 265,306 300,156 309,456
Net balance at end of period 759,383 665,461 580,653
Plus: Ceded reinsurance receivables 73,021 94,443 82,158
Balance at end of period $ 832,404 $ 759,904 $ 662,811