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Debt Senior Notes (Details) (Senior Notes)
Mar. 31, 2015
Dec. 31, 2014
5.875% Senior Notes, Due 2024    
Debt Instrument [Line Items]    
Interest rate 5.875%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= geo_FivePointEightSevenFivePercentSeniorNotesDue2024Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
5.875%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= geo_FivePointEightSevenFivePercentSeniorNotesDue2024Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
5.125% Senior Notes, Due 2023    
Debt Instrument [Line Items]    
Interest rate 5.125%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= geo_FivePointOneTwoFivePercentSeniorNotesDue2023Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
5.125%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= geo_FivePointOneTwoFivePercentSeniorNotesDue2023Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
5.875% Senior Notes, Due 2022    
Debt Instrument [Line Items]    
Interest rate 5.875%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= geo_FivePointEightSevenFivePercentSeniorNotesDue2022Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
5.875%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= geo_FivePointEightSevenFivePercentSeniorNotesDue2022Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
6.625% Senior Notes, Due 2021    
Debt Instrument [Line Items]    
Interest rate 6.625%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= geo_SixPointSixTwoFivePercentSeniorNotesDue2021Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
6.625%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= geo_SixPointSixTwoFivePercentSeniorNotesDue2021Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember