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Summary of Business Organization, Operations and Significant Accounting Policies - Components of Accumulated Other Comprehensive Loss (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Components of Accumulated Other Comprehensive Loss [Roll Forward]    
Beginning balance $ 996,830,000  
Current-period other comprehensive income (loss) before reclassifications (2,254,000) $ (568,000)
Amounts reclassified from other comprehensive income into earnings 0 3,851,000
Net current-period comprehensive income (loss)   3,283,000
Ending balance 913,102,000 996,830,000
Foreign currency translation adjustments, net of tax attributable to The GEO Group, Inc.    
Components of Accumulated Other Comprehensive Loss [Roll Forward]    
Beginning balance (12,314,000) (14,573,000)
Current-period other comprehensive income (loss) before reclassifications 3,107,000 2,259,000
Amounts reclassified from other comprehensive income into earnings   0
Net current-period comprehensive income (loss)   2,259,000
Ending balance (9,207,000) (12,314,000)
Unrealized loss on derivatives, net of tax    
Components of Accumulated Other Comprehensive Loss [Roll Forward]    
Beginning balance (1,476,000) (5,746,000)
Current-period other comprehensive income (loss) before reclassifications (3,276,000) 419,000
Amounts reclassified from other comprehensive income into earnings   3,851,000
Net current-period comprehensive income (loss)   4,270,000
Ending balance (4,752,000) (1,476,000)
Pension adjustments, net of tax    
Components of Accumulated Other Comprehensive Loss [Roll Forward]    
Beginning balance (6,545,000) (3,299,000)
Current-period other comprehensive income (loss) before reclassifications (2,085,000) (3,246,000)
Amounts reclassified from other comprehensive income into earnings   0
Net current-period comprehensive income (loss)   (3,246,000)
Ending balance (8,630,000) (6,545,000)
Accumulated Other Comprehensive Income (Loss)    
Components of Accumulated Other Comprehensive Loss [Roll Forward]    
Beginning balance (20,335,000) (23,618,000)
Ending balance $ (22,589,000) $ (20,335,000)