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Business Combinations - Pro Forma Information (Details) - Community Education Centers - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Business Acquisition [Line Items]    
Pro forma revenues $ 2,300,000 $ 2,400,000
Pro forma net income attributable to the GEO Group, Inc. 160,000 $ 143,000
Revenue of acquiree since acquisition 171,000  
Earnings of acquiree since acquisition 22,000  
Acquisition-related Costs [Member]    
Business Acquisition [Line Items]    
Transaction and merger related costs $ 15,000