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Commitments and Contingencies and Other (Details Textual) In Millions, unless otherwise specified | 3 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2015 USD ($) bed facility | Mar. 31, 2015 Property and Equipment USD ($) | Mar. 31, 2015 National Australia Bank Limited Ravenhall Non-Recourse Debt USD ($) | Mar. 31, 2015 National Australia Bank Limited Ravenhall Non-Recourse Debt AUD | Mar. 31, 2015 National Australia Bank Limited Ravenhall Non-Recourse Debt Construction Facility USD ($) | Mar. 31, 2015 National Australia Bank Limited Ravenhall Non-Recourse Debt Construction Facility AUD | Sep. 30, 2014 National Australia Bank Limited Ravenhall Non-Recourse Debt Construction Facility USD ($) | Sep. 30, 2014 National Australia Bank Limited Ravenhall Non-Recourse Debt Construction Facility AUD | Jan. 28, 2015 Facility management contracts Mesa Verde Detention Facility bed | Feb. 18, 2015 LCS Facilities bed | Feb. 17, 2015 LCS Facilities facility bed
Commitments and Contingencies (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Estimated construction capital project cost | $ 252.1 geo_EstimatedConstructionCapitalProjectCost |  |  |  |  |  |  |  |  |  |
Cost already spent on existing capital projects | 86.1 geo_CostAlreadySpentOnExistingCapitalProjects |  |  |  |  |  |  |  |  |  |
Remaining capital required for capital projects | 166.0 geo_RemainingCapitalRequiredForCapitalProjects |  |  |  |  |  |  |  |  |  |
Contributions in aid of construction |  |  | 88.4 us-gaap_ContributionsInAidOfConstruction / us-gaap_LineOfCreditFacilityAxis = geo_NationalAustraliaBankLimitedMember / us-gaap_LongtermDebtTypeAxis = geo_NonRecourseDebtMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = geo_RavenhallMember | 115.0 us-gaap_ContributionsInAidOfConstruction / us-gaap_LineOfCreditFacilityAxis = geo_NationalAustraliaBankLimitedMember / us-gaap_LongtermDebtTypeAxis = geo_NonRecourseDebtMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = geo_RavenhallMember |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  | 608.4 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = geo_ConstructionFacilityMember / us-gaap_LineOfCreditFacilityAxis = geo_NationalAustraliaBankLimitedMember / us-gaap_LongtermDebtTypeAxis = geo_NonRecourseDebtMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = geo_RavenhallMember | 791.0 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = geo_ConstructionFacilityMember / us-gaap_LineOfCreditFacilityAxis = geo_NationalAustraliaBankLimitedMember / us-gaap_LongtermDebtTypeAxis = geo_NonRecourseDebtMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = geo_RavenhallMember | 608.4 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = geo_ConstructionFacilityMember / us-gaap_LineOfCreditFacilityAxis = geo_NationalAustraliaBankLimitedMember / us-gaap_LongtermDebtTypeAxis = geo_NonRecourseDebtMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = geo_RavenhallMember | 791.0 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = geo_ConstructionFacilityMember / us-gaap_LineOfCreditFacilityAxis = geo_NationalAustraliaBankLimitedMember / us-gaap_LongtermDebtTypeAxis = geo_NonRecourseDebtMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = geo_RavenhallMember |  |  |
Number of beds in a facility |  |  |  |  |  |  |  |  | 400 geo_FacilityNumberofBeds / us-gaap_MajorCustomersAxis = geo_MesaVerdeDetentionFacilityMember / us-gaap_OtherCommitmentsAxis = geo_FacilityManagementContractsMember |  |
Number of correctional and detention facilities acquired |  |  |  |  |  |  |  |  |  |  | 8 geo_BusinessCombinationNumberOfCorrectionalAndDetentionFacilitiesAcquired / us-gaap_BusinessAcquisitionAxis = geo_LCSFacilitiesMember
Number of beds In facilities acquired |  |  |  |  |  |  |  |  |  | 6,500 geo_NumberOfBeds / us-gaap_BusinessAcquisitionAxis = geo_LCSFacilitiesMember | 6,500 geo_NumberOfBeds / us-gaap_BusinessAcquisitionAxis = geo_LCSFacilitiesMember
Number of vacant beds at idle facilities marketed to potential customers | 4,400 geo_NumberOfVacantBedsAtIdleFacilitiesMarketedToPotentialCustomers |  |  |  |  |  |  |  |  |  |
Number of marketed idle facilities | 5 geo_NumberOfMarketedIdleFacilities |  |  |  |  |  |  |  |  |  |
Carrying values of idle facilities marketed to potential customers |  | $ 103.9 geo_CarryingValuesOfIdleFacilitiesMarketedToPotentialCustomers / us-gaap_BalanceSheetLocationAxis = us-gaap_PropertyPlantAndEquipmentMember |  |  |  |  |  |  |  |  |

X
- Definition Business Combination, Number Of Correctional And Detention Facilities Acquired + References No definition available. + Details
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- Definition Carrying Values of Idle Facilities Marketed to Potential Customers + References No definition available. + Details
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- Details
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- Definition Cost already spent on existing capital projects. + References No definition available. + Details
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- Definition Estimated construction capital project cost. + References No definition available. + Details
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- Definition Contract Award, Number of Beds + References No definition available. + Details
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- Definition Number Of Beds + References No definition available. + Details
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- Definition Number of Marketed Idle Facilities + References No definition available. + Details
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- Definition Number of Vacant Beds at Idle Facilities Marketed to Potential Customers + References No definition available. + Details
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- Definition Remaining capital required for capital projects. + References No definition available. + Details
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- Definition Developers, builders, governmental agencies and municipalities will provide the entity with cash, or in some cases property, to extend its services to their properties. Nonrefundable contributions are recorded as contributions in aid of construction ("CIAC"). + References No definition available. + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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