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Related Party Transactions - Additional Information (Detail) - USD ($)
 4 Months Ended 12 Months Ended
Aug. 27, 2020
Dec. 31, 2024
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Series A Cumulative Fixed Rate Perpetual Preferred Interests          
Related Party Transaction [Line Items]          
Preferred interests, non-voting description     While the Series A Preferred Shares are non-voting, the preferred shareholders are entitled to appoint two additional members to Global Indemnity Group, LLC’s Board of Directors whenever the “Unpaid Targeted Priority Return” with respect to the Series A Preferred Shares exceed zero immediately following six or more “Distribution Dates”, whether or not such Distribution Dates occur consecutively.    
Fox Paine Entities          
Related Party Transaction [Line Items]          
Company's total voting power   83.80% 83.80%    
Wyncote LLC          
Related Party Transaction [Line Items]          
Distributions paid     $ 400,000 $ 400,000 $ 400,000
Wyncote LLC | Series A Cumulative Fixed Rate Perpetual Preferred Interests          
Related Party Transaction [Line Items]          
Preferred shares issued 4,000        
Shares issued, price per share $ 1,000        
Preferred shares issued $ 4,000,000        
Fox Paine and Company          
Related Party Transaction [Line Items]          
Restated management agreement date     Aug. 28, 2020    
Current annual service fee   $ 3,200,000      
Management fees     $ 3,200,000 3,100,000 $ 2,900,000
Prepaid management fees   $ 2,200,000 2,200,000 $ 2,100,000  
Greenberg Traurig, LLP          
Related Party Transaction [Line Items]          
Legal fees     $ 200,000    
Board member start date     Dec. 05, 2023