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Summary of Business Organization, Operations and Significant Accounting Policies - Variable Interest Entities (Details)
£ / shares in Units, $ in Millions
1 Months Ended 12 Months Ended
May 02, 2019
Feb. 28, 2011
GBP (£)
director
£ / shares
shares
Dec. 31, 2019
USD ($)
Dec. 31, 2019
GBP (£)
Dec. 31, 2018
USD ($)
Variable Interest Entity [Line Items]          
Variable interest entity ownership percentage in joint venture     50.00%    
Life term of contract 10 years        
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      
GEO Amey          
Variable Interest Entity [Line Items]          
Units of partnership interest, amount   50      
Line of credit, amount outstanding | £       £ 12,000,000.0  
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 | $     $ 12.3   $ 13.4
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%