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Acquisition - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended 24 Months Ended
Jan. 01, 2015
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2015
Business Acquisition [Line Items]                          
Revenue                   $ 534,514 $ 538,778 $ 333,755  
Pre-tax (loss)   $ 46,535 $ 10,598 $ (11,468) $ 1,953 $ 29,463 $ (9,727) $ 9,772 $ 3,238 47,618 32,746 71,194  
Goodwill   $ 6,521       6,521       6,521 6,521 4,820 $ 6,521
Intangible assets $ 32,000                        
Amortization of definite lived intangible assets                   $ 500 500 400  
Business combination, employee related compensation cost paid, which were included in the fair value of net assets acquired                     1,600    
American Reliable Insurance Company                          
Business Acquisition [Line Items]                          
Revenue                     259,000    
Pre-tax (loss)                     (4,200)    
Goodwill           1,701         1,701   1,701
Intangible assets           32,000         $ 32,000   32,000
Intangible assets arising from acquisition deductible for income tax, period                     15 years    
Amortization of definite lived intangible assets                     $ 25,700    
American Bankers Insurance Company                          
Business Acquisition [Line Items]                          
Interest rate on dispute resolution agreement   5.00%               5.00%      
Global Indemnity Group Inc | American Reliable Insurance Company                          
Business Acquisition [Line Items]                          
Aggregate purchase price $ 113,700                        
Business acquisition date                   Jan. 01, 2015      
Acquired voting equity interest 100.00%                        
Customary insurance liabilities, obligations, and mandates $ 283,900                        
Estimated purchase price $ 99,800                        
Global Indemnity Group Inc | American Reliable Insurance Company | Fox Paine and Company                          
Business Acquisition [Line Items]                          
Investment bank fee as a percentage of the amount paid plus required capital to operate American Reliable on a standalone basis                     3.00%    
Investment advisory fee                     $ 1,500    
Aggregate investment advisory fee           $ 6,500         $ 6,500   $ 6,500
Ordinary shares of Global Indemnity issued to pay fees           267,702         267,702   267,702
Global Indemnity Group Inc | Business Acquisition Cost                          
Business Acquisition [Line Items]                          
Business combination, additional costs                     $ 1,800 $ 3,300 $ 5,100