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Cover Page - USD ($)
$ in Billions
 12 Months Ended
Dec. 31, 2020
Feb. 11, 2021
Jun. 30, 2020
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Transition Report false    
Entity File Number 1-14260    
Entity Registrant Name The GEO Group, Inc.    
Entity Incorporation, State or Country Code FL    
Entity Tax Identification Number 65-0043078    
Entity Address, Address Line One 4955 Technology Way    
Entity Address, City or Town Boca Raton    
Entity Address, State or Province FL    
Entity Address, Postal Zip Code 33431    
City Area Code 561    
Local Phone Number 893-0101    
Title of 12(b) Security Common Stock, $0.01 Par Value    
Security Exchange Name NYSE    
Trading Symbol GEO    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Entity Shell Company false    
Entity Common Stock, Shares Outstanding   121,307,472  
Entity Public Float     $ 1.0
Entity Central Index Key 0000923796    
Document Period End Date Dec. 31, 2020    
Document Fiscal Year Focus 2020    
Document Fiscal Period Focus FY    
Amendment Flag false    
Current Fiscal Year End Date --12-31    
Documents Incorporated by Reference

Certain portions of the registrant’s definitive proxy statement pursuant to Regulation 14A of the Securities Exchange Act of 1934 for its 2021 annual meeting of shareholders, which will be filed with the Securities and Exchange Commission within 120 days after the end of the year covered by this report, are incorporated by reference into Part III of this report.