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Debt Senior Credit Facility (Details)								0 Months Ended				0 Months Ended
	Mar. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Mar. 31, 2015 Revolver USD ($)	Mar. 31, 2015 Letter of Credit USD ($)	Mar. 31, 2015 Additional Revolver USD ($)	Mar. 31, 2015 Term Loan USD ($)	Aug. 27, 2014 Term Loan Credit Facility Term Loan USD ($)	Aug. 27, 2014 Term Loan London Interbank Offered Rate (LIBOR)	Aug. 27, 2014 Term Loan London Interbank Offered Rate (LIBOR) Minimum	Aug. 27, 2014 Australian LC Facility Letter of Credit AUD	Aug. 27, 2014 Revolver Revolving Credit Facility USD ($)	Aug. 27, 2014 Revolver London Interbank Offered Rate (LIBOR)	Aug. 27, 2014 Credit Agreement
Line of Credit Facility [Line Items]
Face amount							$ 296,300,000us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = geo_TermLoanMember / us-gaap_LongtermDebtTypeAxis = geo_CreditFacilityTermLoanMember
Basis spread on variable rate								2.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = geo_TermLoanMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember	0.75%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = geo_TermLoanMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember			2.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = geo_RevolverMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember
Maximum borrowing capacity										225,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_LetterOfCreditMember / us-gaap_DebtInstrumentAxis = geo_AustralianLCFacilityMember	700,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_DebtInstrumentAxis = geo_RevolverMember
Amount outstanding on letters of credit										214,000,000us-gaap_LettersOfCreditOutstandingAmount / us-gaap_CreditFacilityAxis = us-gaap_LetterOfCreditMember / us-gaap_DebtInstrumentAxis = geo_AustralianLCFacilityMember
Total leverage ratio													5.75geo_DebtInstrumentCovenantLeverageRatioMaximum / us-gaap_DebtInstrumentAxis = geo_CreditAgreementMember
Senior secured leverage ratio													3.50geo_DebtInstrumentCovenantSeniorSecuredLeverageRatioMaximum / us-gaap_DebtInstrumentAxis = geo_CreditAgreementMember
Interest coverage ratio													3.00geo_DebtInstrumentCovenantInterestCoverageRatioMinimum / us-gaap_DebtInstrumentAxis = geo_CreditAgreementMember
Term loan	294,750,000geo_TermLoans	295,500,000geo_TermLoans				294,750,000geo_TermLoans / us-gaap_CreditFacilityAxis = geo_TermLoanMember
Revolver	403,000,000us-gaap_LineOfCredit	70,000,000us-gaap_LineOfCredit	403,000,000us-gaap_LineOfCredit / us-gaap_CreditFacilityAxis = geo_RevolverMember
Long-term debt				59,000,000us-gaap_LongTermDebt / us-gaap_CreditFacilityAxis = us-gaap_LetterOfCreditMember
Borrowing capacity increase					$ 238,000,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_CreditFacilityAxis = geo_AdditionalRevolverMember
Weighted average interest rate	2.80%us-gaap_LongtermDebtWeightedAverageInterestRate

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- Definition

Debt Instrument, Covenant, Interest Coverage Ratio, Minimum

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Debt Instrument, Covenant, Senior Secured Leverage Ratio, Maximum

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Term loans.

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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No definition available.

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- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

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- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

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- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Weighted average interest rate of long-term debt outstanding.

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