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Goodwill and Other Intangible Assets - Goodwill (Parenthetical) (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($)
Goodwill And Intangible Assets Disclosure [Abstract] |
Goodwill remaining after impairment charge | $ 148.8

X
- Definition Goodwill remaining after impairment charge. + References No definition available. + Details
Name: | geo_GoodwillRemainingAfterImpairmentCharge
Namespace Prefix: | geo_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration