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Condensed Consolidating Financial Information (Details Textual) | Dec. 31, 2017
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Condensed Consolidating Financial Information Disclosure [Abstract] |
Percentage of subsidiary owned | 100.00%

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- Definition Condensed Consolidating Financial Information Disclosure Abstract + References No definition available. + Details
Name: | geo_CondensedConsolidatingFinancialInformationDisclosureAbstract
Namespace Prefix: | geo_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage of subsidiary owned. + References No definition available. + Details
Name: | geo_PercentageOfSubsidiaryOwned
Namespace Prefix: | geo_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant