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Reserve for Losses and Loss Adjustment Expenses (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2022
Sep. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Liability for Claims and Claims Adjustment Expense [Line Items]          
Minimum period for claims resolution     5 years    
Increase in reserve for potential ECO/XPL claims $ 4,000   $ 4,000    
Summary of reserve for losses and loss adjustment expenses          
Balance, beginning of year   $ 3,621,831 3,579,940 $ 2,417,179 $ 2,417,179
Less reinsurance recoverables on unpaid losses and loss adjustment expenses   484,059 451,741 385,087 385,087
Net balance, beginning of year   3,137,772 3,128,199 2,032,092 2,032,092
Net reserves acquired from NORCAL acquisition     0 1,089,103 1,089,103
Net losses:          
Current year     411,397 350,252 797,732
Favorable development of reserves established in prior years, net     (24,304) (18,616) (45,483)
Total     387,093 331,636 752,249
Paid related to:          
Current year     (44,903) (32,346) (109,925)
Prior years     (366,643) (282,713) (635,320)
Total paid     (411,546) (315,059) (745,245)
Net balance, end of period 3,103,746   3,103,746 3,137,772 3,128,199
Plus reinsurance recoverables on unpaid losses and loss adjustment expenses 469,116   469,116 484,059 451,741
Balance, end of period 3,572,862   3,572,862 3,621,831 3,579,940
Specialty P&C Segment          
Net losses:          
Favorable development of reserves established in prior years, net $ 3,000 $ 1,000      
NORCAL Group          
Net losses:          
Current year     4,900 1,800 6,700
Favorable development of reserves established in prior years, net     $ 5,800 $ 2,100 $ 7,900