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Reserve for Loss and Loss Expense - Schedule of Rollforward of Reserve for Loss and Loss Expense (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 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 759,992 688,519
Prior years (13,667) 15,773
Total incurred loss and loss expense 746,325 704,292
Paid loss and loss expense for claims occurring in the:    
Current year 105,268 107,719
Prior years 487,152 435,489
Total paid loss and loss expense 592,420 543,208
Net reserve for loss and loss expense, at end of period 5,721,461 4,879,394
Add: Reinsurance recoverable on unpaid loss and loss expense, at end of period 889,394 622,356
Gross reserve for loss and loss expense, at end of period $ 6,610,855 $ 5,501,750