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Income Taxes - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Income Tax [Line Items]          
Effective income tax expense rate 11.70% 15.70% 5.10% 41.40%  
Net operating loss carryforwards $ 28.3   $ 28.3   $ 26.2
Section 163(j) carryforward $ 4.2   $ 4.2   $ 5.6
UNITED STATES          
Income Tax [Line Items]          
Statutory income tax rates     21.00%    
BERMUDA          
Income Tax [Line Items]          
Statutory income tax rates     0.00%    
UNITED KINGDOM          
Income Tax [Line Items]          
Statutory income tax rates     19.00%    
IRELAND | Non Trading Income          
Income Tax [Line Items]          
Statutory income tax rates     25.00%    
IRELAND | Capital Gain          
Income Tax [Line Items]          
Statutory income tax rates     33.00%    
IRELAND | Trading Income          
Income Tax [Line Items]          
Statutory income tax rates     12.50%    
U.S. Subsidiaries          
Income Tax [Line Items]          
Percentage of consolidated income before taxes 100.00% 67.90%      
Percentage of income earned by Global Indemnity Group, LLC 54.00%   83.10%