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Liability for Unpaid Losses and Loss Adjustment Expenses - Change in Liability for Unpaid Losses and LAE (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]    
Balance at beginning of period $ 510,117 $ 1,038,790
Less: Reinsurance recoverable (183,435) (798,680)
Net balance at beginning of period 326,682 240,110
Incurred related to current year 240,187 202,836
Incurred related to prior years 0 3,318
Total incurred 240,187 206,154
Paid related to current year 96,333 67,783
Paid related to prior years 141,943 178,020
Total paid 238,276 245,803
Net balance at end of period 328,593 200,461
Plus: Reinsurance recoverable 101,036 669,946
Balance at end of period $ 429,629 $ 870,407