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Derivative Financial Instruments - Australia Fullham (Details Textual) (Fullham, Australia)	3 Months Ended	12 Months Ended
	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			50,900,000invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_StatementGeographicalAxis = geo_FullhamAustraliaMember
Fair value of the swap liability				300,000us-gaap_InterestRateCashFlowHedgeLiabilityAtFairValue / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentAssetsMember / us-gaap_StatementGeographicalAxis = geo_FullhamAustraliaMember	200,000us-gaap_InterestRateCashFlowHedgeLiabilityAtFairValue / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentAssetsMember / us-gaap_StatementGeographicalAxis = geo_FullhamAustraliaMember
Ineffective portion of Cash Flow Hedge interest rate swap	$ 0us-gaap_GainLossOnInterestRateCashFlowHedgeIneffectiveness / us-gaap_StatementGeographicalAxis = geo_FullhamAustraliaMember	$ 0us-gaap_GainLossOnInterestRateCashFlowHedgeIneffectiveness / us-gaap_StatementGeographicalAxis = geo_FullhamAustraliaMember

X

- 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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X

- Definition

Fixed interest rate related to the interest rate derivative.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
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X

- 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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Period Type:	duration

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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

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