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Derivative Financial Instruments - Australia Ravenhall (Details) | 3 Months Ended |  | 3 Months Ended |  | 3 Months Ended |
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Mar. 31, 2015 USD ($) | Mar. 31, 2014 USD ($) | Mar. 31, 2015 Ravenhall, Australia USD ($) | Mar. 31, 2015 Ravenhall, Australia Interest Rate Swap USD ($) | Mar. 31, 2015 Ravenhall, Australia Interest Rate Cap USD ($) | Mar. 31, 2015 Ravenhall, Australia Other Noncurrent Liabilities USD ($) | Mar. 31, 2015 Ravenhall, Australia Other Noncurrent Assets Interest Rate Cap USD ($) | Mar. 31, 2015 Ravenhall, Australia Design and construction phase Interest Rate Swap USD ($) | Mar. 31, 2015 Ravenhall, Australia Design and construction phase Interest Rate Swap AUD | Mar. 31, 2015 Ravenhall, Australia Operating phase Interest Rate Swap AUD | Mar. 31, 2015 Ravenhall, Australia Cash Flow Hedge USD ($) | Sep. 30, 2014 Construction Facility Non-Recourse Debt National Australia Bank Limited Ravenhall USD ($) | Sep. 30, 2014 Construction Facility Non-Recourse Debt National Australia Bank Limited Ravenhall AUD
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed interest rate on derivative |  |  |  |  |  |  |  | 3.34%us-gaap_DerivativeFixedInterestRate / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_AssetUnderConstructionMember / us-gaap_StatementGeographicalAxis = geo_RavenhallAustraliaMember | 3.34%us-gaap_DerivativeFixedInterestRate / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_AssetUnderConstructionMember / us-gaap_StatementGeographicalAxis = geo_RavenhallAustraliaMember | 4.21%us-gaap_DerivativeFixedInterestRate / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_PropertyPlantAndEquipmentByTypeAxis = geo_OperatingPhaseofAssetMember / us-gaap_StatementGeographicalAxis = geo_RavenhallAustraliaMember |  |  |
Notional amount coincide with the terms of the non-recourse debt |  |  |  | $ 358,600,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_StatementGeographicalAxis = geo_RavenhallAustraliaMember |  |  |  | $ 107,700,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_AssetUnderConstructionMember / us-gaap_StatementGeographicalAxis = geo_RavenhallAustraliaMember | 140,000,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_AssetUnderConstructionMember / us-gaap_StatementGeographicalAxis = geo_RavenhallAustraliaMember | 466,300,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_PropertyPlantAndEquipmentByTypeAxis = geo_OperatingPhaseofAssetMember / us-gaap_StatementGeographicalAxis = geo_RavenhallAustraliaMember |  |  |
Unrealized losses, net of tax, related to cash flow hedge | (4,080,000)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax | 27,000 us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax |  |  |  |  |  |  |  |  | 4,100,000 us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_StatementGeographicalAxis = geo_RavenhallAustraliaMember |  |
Fair value of the swap liability |  |  |  |  |  | 23,800,000 us-gaap_InterestRateCashFlowHedgeLiabilityAtFairValue / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentLiabilitiesMember / us-gaap_StatementGeographicalAxis = geo_RavenhallAustraliaMember |  |  |  |  |  |  |
Ineffective portion of Cash Flow Hedge interest rate swap |  |  | 0 us-gaap_GainLossOnInterestRateCashFlowHedgeIneffectiveness / us-gaap_StatementGeographicalAxis = geo_RavenhallAustraliaMember |  |  |  |  |  |  |  |  |  |
Lump sum due at completion |  |  |  |  |  |  |  |  |  |  |  | 238,400,000 geo_LongtermDebtMaturitiesRepaymentTermsLumpSumDueatCompletion / us-gaap_DebtInstrumentAxis = geo_ConstructionFacilityMember / us-gaap_LineOfCreditFacilityAxis = geo_NationalAustraliaBankLimitedMember / us-gaap_LongtermDebtTypeAxis = geo_NonRecourseDebtMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = geo_RavenhallMember | 310,000,000 geo_LongtermDebtMaturitiesRepaymentTermsLumpSumDueatCompletion / us-gaap_DebtInstrumentAxis = geo_ConstructionFacilityMember / us-gaap_LineOfCreditFacilityAxis = geo_NationalAustraliaBankLimitedMember / us-gaap_LongtermDebtTypeAxis = geo_NonRecourseDebtMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = geo_RavenhallMember
Payments on non-recourse debt | 1,645,000 us-gaap_RepaymentsOfOtherDebt | 1,403,000 us-gaap_RepaymentsOfOtherDebt |  |  | 1,700,000 us-gaap_RepaymentsOfOtherDebt / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateCapMember / us-gaap_StatementGeographicalAxis = geo_RavenhallAustraliaMember |  |  |  |  |  |  |  |
Loss related to decline in derivative fair value |  |  |  |  | 200,000 us-gaap_IncreaseDecreaseInFairValueOfInterestRateFairValueHedgingInstruments1 / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateCapMember / us-gaap_StatementGeographicalAxis = geo_RavenhallAustraliaMember |  |  |  |  |  |  |  |
Interest rate swap asset value |  |  |  |  |  |  | $ 300,000 us-gaap_InterestRateFairValueHedgeAssetAtFairValue / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateCapMember / us-gaap_StatementGeographicalAxis = geo_RavenhallAustraliaMember |  |  |  |  |  |

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- Definition Long-term Debt, Maturities, Repayment Terms, Lump Sum Due at Completion + References No definition available. + Details
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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition The net gain (loss) during the reporting period due to ineffectiveness in interest rate cash flow hedges. Recognized in earnings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959 + Details
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- Definition Fair value as of the balance sheet date of all derivative assets designated as interest rate fair value hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624163-113959 + Details
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