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Supplementary Information about Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Detail) - USD ($)
$ in Thousands
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
Dec. 31, 2014
Claims Development [Line Items]                    
Liabilities for unpaid losses and loss adjustment expenses, net of reinsurance $ 752,613                  
Non-Core Operations | Property Insurance                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 309,380                  
Liabilities for unpaid losses and loss adjustment expenses, net of reinsurance 52,339                  
Non-Core Operations | Property Insurance | Accident Year 2020                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 155,690 $ 153,421 $ 148,167 $ 125,136            
Non-Core Operations | Property Insurance | Accident Year 2021                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 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 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 7,802                  
Non-Core Operations | Property Insurance | All outstanding liabilities before 2020, net of reinsurance                    
Claims Development [Line Items]                    
All outstanding liabilities, net of reinsurance 34,927                  
Non-Core Operations | Casualty Insurance                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 197,293                  
Liabilities for unpaid losses and loss adjustment expenses, net of reinsurance 307,912                  
Non-Core Operations | Casualty Insurance | Accident Year 2015                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 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 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 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 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 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 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 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 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 4,000                  
Non-Core Operations | Casualty Insurance | All outstanding liabilities before 2015, net of reinsurance                    
Claims Development [Line Items]                    
All outstanding liabilities, net of reinsurance 32,413                  
Penn-America Segment | Property Insurance                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 197,055                  
Liabilities for unpaid losses and loss adjustment expenses, net of reinsurance 40,877                  
Penn-America Segment | Property Insurance | Accident Year 2021                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 74,982 72,804 49,041              
Penn-America Segment | Property Insurance | Accident Year 2022                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 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 50,543                  
Penn-America Segment | Property Insurance | All outstanding liabilities before 2021, net of reinsurance                    
Claims Development [Line Items]                    
All outstanding liabilities, net of reinsurance 4,560                  
Penn-America Segment | Casualty Insurance                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 385,711                  
Liabilities for unpaid losses and loss adjustment expenses, net of reinsurance 351,485                  
Penn-America Segment | Casualty Insurance | Accident Year 2014                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 34,639 34,255 34,020 33,669 31,725 29,152 24,113 17,457 10,583 $ 2,103
Penn-America Segment | Casualty Insurance | Accident Year 2015                    
Claims Development [Line Items]                    
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 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 39,466 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 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 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 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 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 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 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 7,378                  
Penn-America Segment | Casualty Insurance | All outstanding liabilities before 2014, net of reinsurance                    
Claims Development [Line Items]                    
All outstanding liabilities, net of reinsurance $ 6,948