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Reserve for Loss and Loss Expense - Schedule of Rollforward of Reserve for Loss and Loss Expense (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]    
Gross reserve for loss and loss expense, at beginning of period $ 6,589,801 $ 5,336,911
Less: reinsurance recoverable on unpaid loss and loss expense, at beginning of period 1,022,245 618,601
Net reserve for loss and loss expense, at beginning of period 5,567,556 4,718,310
Incurred loss and loss expense for claims occurring in the:    
Current year 2,319,158 2,212,750
Prior years 70,096 182,748
Total incurred loss and loss expense 2,389,254 2,395,498
Paid loss and loss expense for claims occurring in the:    
Current year 594,811 638,494
Prior years 1,199,822 1,053,299
Total paid loss and loss expense 1,794,633 1,691,793
Net reserve for loss and loss expense, at end of period 6,162,177 5,422,015
Add: Reinsurance recoverable on unpaid loss and loss expense, at end of period 914,245 1,029,981
Gross reserve for loss and loss expense, at end of period $ 7,076,422 $ 6,451,996