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Derivative Financial Instruments - Australia Fullham (Details Textual) (Fullham, Australia) | 3 Months Ended | 12 Months Ended |  |
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Mar. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Mar. 31, 2015 Interest Rate Swap AUD | Mar. 31, 2015 Other Noncurrent Assets USD ($) | Dec. 31, 2014 Other Noncurrent Assets USD ($)
Interest Rate Swaps [Abstract] |  |  |  |  |
Fixed interest rate on cash flow interest rate derivative | 9.70%us-gaap_DerivativeFixedInterestRate / us-gaap_StatementGeographicalAxis = geo_FullhamAustraliaMember |  |  |  |
Notional amount coincide with the terms of the non-recourse debt |  |  | 50,900,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_StatementGeographicalAxis = geo_FullhamAustraliaMember |  |
Fair value of the swap liability |  |  |  | 300,000 us-gaap_InterestRateCashFlowHedgeLiabilityAtFairValue / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentAssetsMember / us-gaap_StatementGeographicalAxis = geo_FullhamAustraliaMember | 200,000 us-gaap_InterestRateCashFlowHedgeLiabilityAtFairValue / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentAssetsMember / us-gaap_StatementGeographicalAxis = geo_FullhamAustraliaMember
Ineffective portion of Cash Flow Hedge interest rate swap | $ 0 us-gaap_GainLossOnInterestRateCashFlowHedgeIneffectiveness / us-gaap_StatementGeographicalAxis = geo_FullhamAustraliaMember | $ 0 us-gaap_GainLossOnInterestRateCashFlowHedgeIneffectiveness / us-gaap_StatementGeographicalAxis = geo_FullhamAustraliaMember |  |  |

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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 Fixed interest rate related to the interest rate derivative. + References No definition available. + 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 interest rate derivative liabilities designated as cash flow 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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- Details
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