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Consolidated Statements of Operations (Unaudited) (Parenthetical) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Income Statement [Abstract] |  |
Income tax provision on equity in earnings of affiliates | $ 613 geo_IncomeTaxProvisionOnEquityInEarningsOfAffiliates | $ 549 geo_IncomeTaxProvisionOnEquityInEarningsOfAffiliates

X
- Definition The sum of the current income tax expense (benefit) and the deferred income tax expense (benefit) pertaining the earnings from its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. + References No definition available. + Details
Name: | geo_IncomeTaxProvisionOnEquityInEarningsOfAffiliates
Namespace Prefix: | geo_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_IncomeStatementAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration