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Debt - Australia - Ravenhall (Details)
9 Months Ended
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Sep. 30, 2014
Australian Subsidiary's Non Recourse Debt
Sep. 30, 2014
National Australia Bank Limited
Non Recourse Debt
Construction Facility
Dec. 31, 2014
Ravenhall
National Australia Bank Limited
Non Recourse Debt
USD ($)
Dec. 31, 2014
Ravenhall
National Australia Bank Limited
Non Recourse Debt
AUD
Dec. 31, 2014
Ravenhall
National Australia Bank Limited
Non Recourse Debt
Construction Facility
USD ($)
Dec. 31, 2014
Ravenhall
National Australia Bank Limited
Non Recourse Debt
Construction Facility
AUD
Debt Instrument [Line Items]                
Maximum borrowing capacity             $ 645,300,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= geo_ConstructionFacilityMember
/ us-gaap_LineOfCreditFacilityAxis
= geo_NationalAustraliaBankLimitedMember
/ us-gaap_LongtermDebtTypeAxis
= geo_NonRecourseDebtMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= geo_RavenhallMember
791,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= geo_ConstructionFacilityMember
/ us-gaap_LineOfCreditFacilityAxis
= geo_NationalAustraliaBankLimitedMember
/ us-gaap_LongtermDebtTypeAxis
= geo_NonRecourseDebtMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= geo_RavenhallMember
Debt instrument basis spread on variable rate     1.40%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_LongtermDebtTypeAxis
= geo_AustralianSubsidiariesNonRecourseDebtMember
2.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= geo_ConstructionFacilityMember
/ us-gaap_LineOfCreditFacilityAxis
= geo_NationalAustraliaBankLimitedMember
/ us-gaap_LongtermDebtTypeAxis
= geo_NonRecourseDebtMember
       
Lump sum due at completion         252,900,000geo_LongtermDebtMaturitiesRepaymentTermsLumpSumDueatCompletion
/ us-gaap_LineOfCreditFacilityAxis
= geo_NationalAustraliaBankLimitedMember
/ us-gaap_LongtermDebtTypeAxis
= geo_NonRecourseDebtMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= geo_RavenhallMember
310,000,000geo_LongtermDebtMaturitiesRepaymentTermsLumpSumDueatCompletion
/ us-gaap_LineOfCreditFacilityAxis
= geo_NationalAustraliaBankLimitedMember
/ us-gaap_LongtermDebtTypeAxis
= geo_NonRecourseDebtMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= geo_RavenhallMember
   
Revolver 70,000,000us-gaap_LineOfCredit 340,000,000us-gaap_LineOfCredit         79,400,000us-gaap_LineOfCredit
/ us-gaap_DebtInstrumentAxis
= geo_ConstructionFacilityMember
/ us-gaap_LineOfCreditFacilityAxis
= geo_NationalAustraliaBankLimitedMember
/ us-gaap_LongtermDebtTypeAxis
= geo_NonRecourseDebtMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= geo_RavenhallMember
 
Deferred financing costs capitalized             $ 17,200,000us-gaap_DeferredFinanceCostsCurrentNet
/ us-gaap_DebtInstrumentAxis
= geo_ConstructionFacilityMember
/ us-gaap_LineOfCreditFacilityAxis
= geo_NationalAustraliaBankLimitedMember
/ us-gaap_LongtermDebtTypeAxis
= geo_NonRecourseDebtMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= geo_RavenhallMember