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Goodwill and Intangible Assets - Additional Information (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Intangible Assets And Goodwill [Line Items]        
Goodwill $ 4,820,000 $ 4,820,000    
Amortization of definite lived intangible assets $ 400,000 $ 400,000 $ 400,000  
Weighted average amortization period for definite lived intangible assets 15 years 15 years    
Net Value $ 14,000,000 $ 14,000,000    
Impairment of indefinite lived intangible assets 0 0    
Definite lived intangible assets 100,000 500,000    
State insurance licenses        
Intangible Assets And Goodwill [Line Items]        
Net Value 5,000,000 5,000,000    
Impairment of indefinite lived intangible assets 0 0    
Other Than Agent Relationships        
Intangible Assets And Goodwill [Line Items]        
Impairment of definite lived intangible assets 0 0    
Penn-America Segment        
Intangible Assets And Goodwill [Line Items]        
Goodwill 4,800,000 4,800,000    
Change in goodwill 0 0    
Impairment of goodwill 0 0 0  
Farm, Ranch & Stable Business and Specialty Property Business        
Intangible Assets And Goodwill [Line Items]        
Goodwill 1,700,000      
Farm, Ranch & Stable        
Intangible Assets And Goodwill [Line Items]        
Goodwill $ 600,000      
Impairment of goodwill     $ 600,000  
Impairment, Intangible Asset, Finite-Lived, Statement of Income or Comprehensive Income [Extensible Enumeration] Other Cost and Expense, Operating      
Impairment of definite lived intangible assets $ 100,000      
Specialty Property Business        
Intangible Assets And Goodwill [Line Items]        
Goodwill 1,100,000      
Impairment of goodwill       $ 1,100,000
Non-Core Operations        
Intangible Assets And Goodwill [Line Items]        
Goodwill 0 $ 0    
Impairment, Intangible Asset, Finite-Lived, Statement of Income or Comprehensive Income [Extensible Enumeration]     Other Cost and Expense, Operating  
Impairment of definite lived intangible assets     $ 100,000  
Non-Core Operations | State insurance licenses        
Intangible Assets And Goodwill [Line Items]        
Net Value $ 5,000,000      
Impairment of indefinite lived intangible assets     5,000,000  
Non-Core Operations | Corporate and Other Operating Expenses        
Intangible Assets And Goodwill [Line Items]        
Impairment of goodwill     $ 600,000