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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 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]        
Balance at beginning of period $ 429,629 $ 870,407 $ 510,117 $ 1,038,790
Less: Reinsurance recoverable (101,036) (669,946) (183,435) (798,680)
Net balance at beginning of period 328,593 200,461 326,682 240,110
Incurred related to current year 243,572 209,902 483,759 412,738
Incurred related to prior years 0 13,825 0 17,143
Total incurred 243,572 223,727 483,759 429,881
Paid related to current year 151,587 123,258 247,921 191,041
Paid related to prior years 109,051 133,161 250,993 311,181
Total paid 260,638 256,419 498,914 502,222
Net balance at end of period 311,527 167,769 311,527 167,769
Plus: Reinsurance recoverable 33,121 495,250 33,121 495,250
Balance at end of period $ 344,648 $ 663,019 $ 344,648 $ 663,019