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

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- 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) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 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 + Details
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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 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 9 -Article 5 Reference 3: 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 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.12) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 11 -Article 7 + Details
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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 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=28200181&loc=SL6759159-111685 + Details
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