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Summary of Business Organization, Operations and Significant Accounting Policies - Variable Interest Entities (Details)
£ / shares in Units, $ in Thousands
1 Months Ended 12 Months Ended
Feb. 28, 2011
GBP (£)
director
£ / shares
shares
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2018
GBP (£)
Dec. 31, 2017
GBP (£)
Variable Interest Entity [Line Items]          
Variable interest entity ownership percentage in joint venture     50.00%    
Partnership interest share amount | £ £ 100        
Units of partnership interest, amount 100        
Value per partnership interest shares | £ / shares £ 1        
Directors appointed to board by each party | director 3        
Line of Credit, amount outstanding | $   $ 490,843 $ 270,559    
GEO Amey          
Variable Interest Entity [Line Items]          
Units of partnership interest, amount 50        
Line of Credit, amount outstanding   $ 15,300   £ 12,000,000  
SACS          
Variable Interest Entity [Line Items]          
Life term of contract   25 years      
Reduction of government guarantee in case of default   80.00%      
Investment in joint venture | $   $ 13,400 18,100    
GEO UK          
Variable Interest Entity [Line Items]          
Variable interest entity ownership percentage in joint venture   50.00%      
Units of partnership interest, amount 50        
Kensani Corrections          
Variable Interest Entity [Line Items]          
Variable interest entity ownership percentage in joint venture   50.00%      
Other Noncurrent Assets | GEO Amey          
Variable Interest Entity [Line Items]          
Due from joint venture, current     $ 1,700   £ 1,300,000