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Condensed Consolidating Financial Information (Details Textual)	Mar. 31, 2015	Dec. 31, 2014	Mar. 19, 2013
Debt Instrument [Line Items]
Percentage of subsidiary owned	100.00%geo_PercentageOfSubsidiaryOwned
Senior Notes | 6.625% Senior Notes, Due 2021
Debt Instrument [Line Items]
Notes bear interest at a rate	6.625%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = geo_SixPointSixTwoFivePercentSeniorNotesDue2021Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember	6.625%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = geo_SixPointSixTwoFivePercentSeniorNotesDue2021Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember
Senior Notes | Senior Notes Due 2023
Debt Instrument [Line Items]
Notes bear interest at a rate			5.125%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = geo_SeniorNotesDue2023Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember
Senior Notes | Senior Notes Due 2022 [Member] [Member]
Debt Instrument [Line Items]
Notes bear interest at a rate	5.875%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = geo_SeniorNotesDue2022MemberMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember

X

- Definition

Percentage of subsidiary owned.

+ References

No definition available.

+ Details

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X

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(1))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Details

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