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Liability for Unpaid Losses and Loss Adjustment Expenses - Change in Liability for Unpaid Losses and LAE (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]      
Balance at beginning of year $ 346,216 $ 322,465 $ 267,760
Less: Reinsurance recoverable (115,860) (119,522) (123,221)
Net balance at beginning of period 230,356 202,943 144,539
Incurred (recovered) related to current year 913,419 724,755 700,473
Incurred Loss and LAE Prior Years 24,980 54,450 58,337
Total incurred 938,399 779,205 758,810
Paid related to Current year 624,580 526,695 513,308
Paid related to Prior years 304,065 225,097 187,098
Total paid 928,645 751,792 700,406
Net balance at end of period 240,110 230,356 202,943
Plus: Reinsurance recoverable 798,680 115,860 119,522
Balance at end of year $ 1,038,790 $ 346,216 $ 322,465