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Related Party Transactions - Additional Information (Detail) - USD ($)
 12 Months Ended
Aug. 27, 2020
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Series A Preferred Interest        
Related Party Transaction [Line Items]        
Preferred shares issued 4,000      
Shares issued, price per share $ 1,000      
Preferred shares issued $ 4,000,000      
Preferred interests, non-voting description   While these preferred interests 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 preferred interests 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   83.20%    
Wyncote LLC | Series A Preferred Interest        
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   $ 3,000,000.0    
Management fees   2,900,000 $ 2,700,000 $ 2,600,000
Prepaid management fees   $ 2,100,000 $ 1,900,000  
Advisory services fees paid       10,000,000.0
Advisory services fees, accrued       10,000,000.0
Advisory services fees approved by conflicts committee       $ 10,000,000.0