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Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Detail)
$ in Thousands
Dec. 31, 2024
USD ($)
Claim
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Non-Core Operations | Property Insurance                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claims Adjustment Expenses, Net of Reinsurance $ 167,235                  
Non-Core Operations | Property Insurance | Accident Year 2021                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claims Adjustment Expenses, Net of Reinsurance 109,567 $ 109,047 $ 108,443 $ 111,042            
IBNR [1] $ 3,791                  
Cumulative Number of Reported Claims | Claim 10,406                  
Non-Core Operations | Property Insurance | Accident Year 2022                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claims Adjustment Expenses, Net of Reinsurance $ 47,765 47,558 44,668              
IBNR [1] $ 1,816                  
Cumulative Number of Reported Claims | Claim 8,755                  
Non-Core Operations | Property Insurance | Accident Year 2023                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claims Adjustment Expenses, Net of Reinsurance $ 9,724 10,105                
IBNR [2] $ 1,701                  
Cumulative Number of Reported Claims | Claim 3,269                  
Non-Core Operations | Property Insurance | Accident Year 2024                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claims Adjustment Expenses, Net of Reinsurance $ 179                  
IBNR [2] $ 134                  
Cumulative Number of Reported Claims | Claim 175                  
Non-Core Operations | Casualty Insurance                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claims Adjustment Expenses, Net of Reinsurance $ 480,777                  
Non-Core Operations | Casualty Insurance | Accident Year 2015                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claims Adjustment Expenses, Net of Reinsurance 29,563 29,820 29,905 30,885 $ 32,297 $ 35,081 $ 36,534 $ 35,350 $ 33,731 $ 31,802
IBNR [3] $ 231                  
Cumulative Number of Reported Claims | Claim 0                  
Non-Core Operations | Casualty Insurance | Accident Year 2016                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claims Adjustment Expenses, Net of Reinsurance $ 29,556 29,460 26,130 30,047 30,308 29,685 32,042 33,246 33,548  
IBNR [3] $ 778                  
Cumulative Number of Reported Claims | Claim 0                  
Non-Core Operations | Casualty Insurance | Accident Year 2017                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claims Adjustment Expenses, Net of Reinsurance $ 24,629 26,168 31,260 31,077 32,040 31,138 32,097 32,645    
IBNR [3] $ 1,235                  
Cumulative Number of Reported Claims | Claim 0                  
Non-Core Operations | Casualty Insurance | Accident Year 2018                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claims Adjustment Expenses, Net of Reinsurance $ 35,965 34,131 35,067 34,749 31,126 30,168 29,798      
IBNR [3] $ 2,249                  
Cumulative Number of Reported Claims | Claim 0                  
Non-Core Operations | Casualty Insurance | Accident Year 2019                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claims Adjustment Expenses, Net of Reinsurance $ 35,919 37,619 41,398 40,469 36,933 36,892        
IBNR [3] $ 5,237                  
Cumulative Number of Reported Claims | Claim 0                  
Non-Core Operations | Casualty Insurance | Accident Year 2020                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claims Adjustment Expenses, Net of Reinsurance $ 53,651 53,765 57,890 56,041 55,088          
IBNR [3] $ 15,306                  
Cumulative Number of Reported Claims | Claim 0                  
Non-Core Operations | Casualty Insurance | Accident Year 2021                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claims Adjustment Expenses, Net of Reinsurance $ 80,870 81,538 79,396 76,971            
IBNR [3] $ 32,660                  
Cumulative Number of Reported Claims | Claim 0                  
Non-Core Operations | Casualty Insurance | Accident Year 2022                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claims Adjustment Expenses, Net of Reinsurance $ 118,123 114,189 109,182              
IBNR [3] $ 66,732                  
Cumulative Number of Reported Claims | Claim 0                  
Non-Core Operations | Casualty Insurance | Accident Year 2023                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claims Adjustment Expenses, Net of Reinsurance $ 68,229 66,102                
IBNR [3] $ 48,361                  
Cumulative Number of Reported Claims | Claim 0                  
Non-Core Operations | Casualty Insurance | Accident Year 2024                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claims Adjustment Expenses, Net of Reinsurance $ 4,272                  
IBNR [3] $ 3,550                  
Cumulative Number of Reported Claims | Claim 0                  
Penn-America Segment | Property Insurance                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claims Adjustment Expenses, Net of Reinsurance $ 235,391                  
Penn-America Segment | Property Insurance | Accident Year 2022                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claims Adjustment Expenses, Net of Reinsurance 75,739 81,232 80,485              
IBNR [4] $ 2,000                  
Cumulative Number of Reported Claims | Claim 3,620                  
Penn-America Segment | Property Insurance | Accident Year 2023                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claims Adjustment Expenses, Net of Reinsurance $ 71,298 72,862                
IBNR $ 5,438                  
Cumulative Number of Reported Claims | Claim 3,055                  
Penn-America Segment | Property Insurance | Accident Year 2024                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claims Adjustment Expenses, Net of Reinsurance $ 88,354                  
IBNR $ 19,693                  
Cumulative Number of Reported Claims | Claim 3,269                  
Penn-America Segment | Casualty Insurance                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claims Adjustment Expenses, Net of Reinsurance $ 821,483                  
Penn-America Segment | Casualty Insurance | Accident Year 2015                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claims Adjustment Expenses, Net of Reinsurance 43,502 43,764 45,254 45,439 45,968 48,462 46,958 47,055 46,306 $ 47,299
IBNR [2] $ 822                  
Cumulative Number of Reported Claims | Claim 1,787                  
Penn-America Segment | Casualty Insurance | Accident Year 2016                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claims Adjustment Expenses, Net of Reinsurance $ 41,622 42,166 42,291 42,237 42,798 43,055 44,758 45,230 $ 45,684  
IBNR [2] $ 712                  
Cumulative Number of Reported Claims | Claim 1,646                  
Penn-America Segment | Casualty Insurance | Accident Year 2017                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claims Adjustment Expenses, Net of Reinsurance $ 43,503 45,212 45,581 45,071 44,078 44,720 45,970 $ 46,050    
IBNR [2] $ 1,380                  
Cumulative Number of Reported Claims | Claim 1,656                  
Penn-America Segment | Casualty Insurance | Accident Year 2018                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claims Adjustment Expenses, Net of Reinsurance $ 48,100 47,721 47,726 47,175 47,783 48,450 $ 48,830      
IBNR [2] $ 1,430                  
Cumulative Number of Reported Claims | Claim 2,009                  
Penn-America Segment | Casualty Insurance | Accident Year 2019                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claims Adjustment Expenses, Net of Reinsurance $ 72,663 69,013 63,139 61,055 59,384 $ 59,512        
IBNR [2] $ 3,475                  
Cumulative Number of Reported Claims | Claim 2,359                  
Penn-America Segment | Casualty Insurance | Accident Year 2020                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claims Adjustment Expenses, Net of Reinsurance $ 90,542 86,132 75,412 71,693 $ 72,149          
IBNR [2],[4] $ 6,907                  
Cumulative Number of Reported Claims | Claim 2,515                  
Penn-America Segment | Casualty Insurance | Accident Year 2021                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claims Adjustment Expenses, Net of Reinsurance $ 114,164 108,042 96,268 $ 96,705            
IBNR [4] $ 17,096                  
Cumulative Number of Reported Claims | Claim 3,162                  
Penn-America Segment | Casualty Insurance | Accident Year 2022                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claims Adjustment Expenses, Net of Reinsurance $ 130,487 129,796 $ 123,985              
IBNR [4] $ 44,021                  
Cumulative Number of Reported Claims | Claim 3,292                  
Penn-America Segment | Casualty Insurance | Accident Year 2023                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claims Adjustment Expenses, Net of Reinsurance $ 123,133 $ 122,770                
IBNR [4] $ 75,154                  
Cumulative Number of Reported Claims | Claim 2,230                  
Penn-America Segment | Casualty Insurance | Accident Year 2024                    
Claims Development [Line Items]                    
Incurred Claims and Allocated Claims Adjustment Expenses, Net of Reinsurance $ 113,767                  
IBNR [4] $ 94,301                  
Cumulative Number of Reported Claims | Claim 1,358                  
[1] Incurred-but-not-reported liabilities plus expected development on reported claims
[2] Incurred-but-not-reported liabilities plus expected development on reported claims
[3] Incurred-but-not-reported liabilities plus expected development on reported claims
[4] Incurred-but-not-reported liabilities plus expected development on reported claims