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Liability for Unpaid Losses and Loss Adjustment Expenses - Additional Information (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Changes in prior year reserve $ 72 $ 9,544 $ (8,070)  
Unpaid losses and loss adjustment expense reserves 800,391 850,599 832,404 $ 759,904
Unpaid losses and loss adjustment expense reserves, net 739,637 777,770 759,383 665,461
Unpaid losses and loss adjustment expense reserves $ 20,696 $ 21,107 $ 21,647 $ 21,985
Survival ratio on a gross basis for open A&E claims, periods 14 years 3 months 18 days 15 years 1 month 6 days 16 years 10 months 24 days  
Survival ratio on net basis for open A&E claims, periods 19 years 1 month 6 days 20 years 10 months 24 days 22 years 9 months 18 days  
Construction Defect        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Unpaid losses and loss adjustment expense reserves $ 25,800 $ 30,400    
Unpaid losses and loss adjustment expense reserves, net 24,800 28,800    
IBNR Reserves | Asbestos        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Unpaid losses and loss adjustment expense reserves 15,200 17,300 $ 18,900  
Case Reserves | Asbestos        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Unpaid losses and loss adjustment expense reserves 5,500 3,800 2,800  
Non-Core Operations        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Changes in prior year reserve (1,700) (20,300) (10,900)  
Non-Core Operations | Accident Years 2017 and 2019        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Changes in prior year reserve (7,800)      
Non-Core Operations | Accident Years 2022 and 2023        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Changes in prior year reserve 6,100      
Non-Core Operations | General Liability        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Changes in prior year reserve   10,200 (2,400)  
Non-Core Operations | Property        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Changes in prior year reserve   800 1,400  
Non-Core Operations | Professional        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Changes in prior year reserve     (2,100)  
Non-Core Operations | Reinsurance        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Changes in prior year reserve     (7,600)  
Non-Core Operations | Reinsurance | 2013 through 2021 Accident Years        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Changes in prior year reserve   (17,700)    
Non-Core Operations | Reinsurance | Prior Accident Year        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Changes in prior year reserve   (31,200)    
Non-Core Operations | Reinsurance | Accident Years 2016 and 2017 and 2019 through 2022        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Changes in prior year reserve   7,200    
Non-Core Operations | Reinsurance | Accident Years 2012 and 2019 through 2022        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Changes in prior year reserve   6,300    
Non-Core Operations | Reinsurance | 2016 Accident Year        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Changes in prior year reserve     (3,600)  
Non-Core Operations | Reinsurance | 2019 through 2021 Accident Years        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Changes in prior year reserve     2,300  
Non-Core Operations | Reinsurance | Accident Years 2016 and 2017 through 2021        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Changes in prior year reserve     (6,300)  
Penn-America Segment        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Changes in prior year reserve 1,800 29,900 2,800  
Penn-America Segment | General Liability        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Changes in prior year reserve   28,600 6,000  
Penn-America Segment | Property        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Changes in prior year reserve (10,200) $ 1,300 $ (3,200)  
Penn-America Segment | Casualty        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Changes in prior year reserve $ 12,000