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Supplementary Information about Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Detail) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Claims Development [Line Items]                    
Liabilities for unpaid losses and loss adjustment expenses, net of reinsurance $ 724,594                  
Non-Core Operations | Property Insurance                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 158,228                  
Liabilities for unpaid losses and loss adjustment expenses, net of reinsurance 42,357                  
Non-Core Operations | Property Insurance | Accident years 2021 through 2024                    
Claims Development [Line Items]                    
Liabilities for unpaid losses and loss adjustment expenses, net of reinsurance 9,007                  
Non-Core Operations | Property Insurance | Accident Year 2021                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 104,575 $ 102,420 $ 100,865 $ 84,333            
Non-Core Operations | Property Insurance | Accident Year 2022                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 45,613 43,468 35,635              
Non-Core Operations | Property Insurance | Accident Year 2023                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 8,008 7,802                
Non-Core Operations | Property Insurance | Accident Year 2024                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 32                  
Non-Core Operations | Property Insurance | All outstanding liabilities before 2021, net of reinsurance                    
Claims Development [Line Items]                    
All outstanding liabilities, net of reinsurance 33,350                  
Non-Core Operations | Casualty Insurance                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 253,061                  
Liabilities for unpaid losses and loss adjustment expenses, net of reinsurance 256,226                  
Non-Core Operations | Casualty Insurance | Accident Years 2015 through 2024                    
Claims Development [Line Items]                    
Liabilities for unpaid losses and loss adjustment expenses, net of reinsurance 227,716                  
Non-Core Operations | Casualty Insurance | Accident Year 2015                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 28,609 28,445 28,379 28,231 $ 27,005 $ 26,144 $ 23,354 $ 17,615 $ 11,470 $ 3,979
Non-Core Operations | Casualty Insurance | Accident Year 2016                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 27,355 25,791 23,539 22,005 19,383 18,196 14,495 9,782 4,164  
Non-Core Operations | Casualty Insurance | Accident Year 2017                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 23,207 22,904 21,912 20,183 18,263 11,915 7,230 2,633    
Non-Core Operations | Casualty Insurance | Accident Year 2018                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 31,092 25,403 23,041 19,773 13,320 6,769 2,063      
Non-Core Operations | Casualty Insurance | Accident Year 2019                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 28,016 25,553 21,877 15,271 7,814 2,406        
Non-Core Operations | Casualty Insurance | Accident Year 2020                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 32,237 27,235 18,816 12,074 3,346          
Non-Core Operations | Casualty Insurance | Accident Year 2021                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 37,785 23,355 11,121 4,820            
Non-Core Operations | Casualty Insurance | Accident Year 2022                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 33,305 14,607 4,517              
Non-Core Operations | Casualty Insurance | Accident Year 2023                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 11,077 4,000                
Non-Core Operations | Casualty Insurance | Accident Year 2024                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 378                  
Non-Core Operations | Casualty Insurance | All outstanding liabilities before 2015, net of reinsurance                    
Claims Development [Line Items]                    
All outstanding liabilities, net of reinsurance 28,510                  
Penn-America Segment | Property Insurance                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 189,205                  
Liabilities for unpaid losses and loss adjustment expenses, net of reinsurance 49,907                  
Penn-America Segment | Property Insurance | Accident Year 2022                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 73,138 71,530 48,646              
Penn-America Segment | Property Insurance | Accident Year 2023                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 64,492 50,543                
Penn-America Segment | Property Insurance | Accident Year 2024                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 51,575                  
Penn-America Segment | Property Insurance | All outstanding liabilities before 2021, net of reinsurance | Accident Years 2022 through 2024                    
Claims Development [Line Items]                    
Liabilities for unpaid losses and loss adjustment expenses, net of reinsurance 46,186                  
Penn-America Segment | Property Insurance | All outstanding liabilities before 2022, net of reinsurance                    
Claims Development [Line Items]                    
All outstanding liabilities, net of reinsurance 3,721                  
Penn-America Segment | Casualty Insurance                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 450,116                  
Liabilities for unpaid losses and loss adjustment expenses, net of reinsurance 376,104                  
Penn-America Segment | Casualty Insurance | Accident Years 2015 through 2024                    
Claims Development [Line Items]                    
Liabilities for unpaid losses and loss adjustment expenses, net of reinsurance 371,367                  
Penn-America Segment | Casualty Insurance | Accident Year 2015                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 42,261 41,655 40,596 39,078 37,850 34,932 28,579 20,459 11,999 $ 2,903
Penn-America Segment | Casualty Insurance | Accident Year 2016                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 39,924 39,466 38,597 36,472 33,734 28,601 17,314 11,130 $ 3,478  
Penn-America Segment | Casualty Insurance | Accident Year 2017                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 40,137 39,833 36,672 31,766 26,834 19,818 10,286 $ 4,412    
Penn-America Segment | Casualty Insurance | Accident Year 2018                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 44,556 41,133 34,019 27,571 17,714 11,622 $ 3,575      
Penn-America Segment | Casualty Insurance | Accident Year 2019                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 61,450 51,672 38,153 24,082 12,015 $ 4,818        
Penn-America Segment | Casualty Insurance | Accident Year 2020                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 68,866 55,914 33,882 14,672 $ 3,795          
Penn-America Segment | Casualty Insurance | Accident Year 2021                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 67,334 44,663 20,405 $ 5,639            
Penn-America Segment | Casualty Insurance | Accident Year 2022                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 55,355 29,358 $ 10,346              
Penn-America Segment | Casualty Insurance | Accident Year 2023                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 23,662 $ 7,378                
Penn-America Segment | Casualty Insurance | Accident Year 2024                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 6,571                  
Penn-America Segment | Casualty Insurance | All outstanding liabilities before 2015, net of reinsurance                    
Claims Development [Line Items]                    
All outstanding liabilities, net of reinsurance $ 4,737