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Business Segments and Geographic Information (Details Textual) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Schedule of Equity Method Investments [Line Items]
Number of reportable business segment	4us-gaap_NumberOfReportableSegments
Equity in earnings (losses) of affiliates, net of income tax provision	$ 1,485,000us-gaap_IncomeLossFromEquityMethodInvestments	$ 1,484,000us-gaap_IncomeLossFromEquityMethodInvestments
SACS
Schedule of Equity Method Investments [Line Items]
Ownership percentage in Entity	50.00%us-gaap_VariableInterestEntityOwnershipPercentage / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = geo_SouthAfricanCustodialServicesPtyLimitedMember
Equity in earnings (losses) of affiliates, net of income tax provision	1,100,000us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = geo_SouthAfricanCustodialServicesPtyLimitedMember	1,200,000us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = geo_SouthAfricanCustodialServicesPtyLimitedMember
Investment in Joint Ventures	8,800,000us-gaap_EquityMethodInvestments / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = geo_SouthAfricanCustodialServicesPtyLimitedMember		8,000,000us-gaap_EquityMethodInvestments / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = geo_SouthAfricanCustodialServicesPtyLimitedMember
Geo Amey
Schedule of Equity Method Investments [Line Items]
Ownership percentage in Entity	50.00%us-gaap_VariableInterestEntityOwnershipPercentage / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = geo_GeoAmeyMember
Equity in earnings (losses) of affiliates, net of income tax provision	400,000us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = geo_GeoAmeyMember	300,000us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = geo_GeoAmeyMember
Investment in Joint Ventures	$ (1,700,000)us-gaap_EquityMethodInvestments / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = geo_GeoAmeyMember		$ (2,200,000)us-gaap_EquityMethodInvestments / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = geo_GeoAmeyMember

X

- Definition

This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.12)

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 323

-SubTopic 10

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=35755396&loc=d3e33749-111570

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- Definition

This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

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-Section 45

-Paragraph 28

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

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-Number 210

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

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Reference 4: http://www.xbrl.org/2003/role/presentationRef

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-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688



Reference 5: http://www.xbrl.org/2003/role/presentationRef

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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

+ References

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- Definition

Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 50

-Paragraph 5A

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