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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, 2023
Dec. 31, 2022
Dec. 31, 2021
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]      
Balance at beginning of year $ 1,038,790 $ 346,216 $ 322,465
Less: Reinsurance recoverable (798,680) (115,860) (119,522)
Net balance at beginning of period 240,110 230,356 202,943
Incurred (recovered) related to current year 882,064 913,419 724,755
Incurred Loss and LAE Prior Years 110,573 24,980 54,450
Total incurred 992,636 938,399 779,205
Paid related to Current year 526,594 624,580 526,695
Paid related to Prior years 379,470 304,065 225,097
Total paid 906,064 928,645 751,792
Net balance at end of period 326,682 240,110 230,356
Plus: Reinsurance recoverable 183,435 798,680 115,860
Balance at end of year $ 510,117 $ 1,038,790 $ 346,216