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Goodwill and Other Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Schedule of Finite and Indefinite-Lived Intangible Assets [Line Items]
Accumulated Amortization	$ (72,779)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization	$ (68,516)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Net Carrying Amount	178,971us-gaap_FiniteLivedIntangibleAssetsNet
Gross carrying amount	296,950us-gaap_IntangibleAssetsGrossExcludingGoodwill	223,791us-gaap_IntangibleAssetsGrossExcludingGoodwill
Total acquired intangible assets	224,171us-gaap_IntangibleAssetsNetExcludingGoodwill	155,275us-gaap_IntangibleAssetsNetExcludingGoodwill
Facility management contracts
Schedule of Finite and Indefinite-Lived Intangible Assets [Line Items]
Weighted Average Useful Life (years)	15 years 6 months
Gross Carrying Amount	227,750us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = geo_FacilityManagementContractsMember	154,591us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = geo_FacilityManagementContractsMember
Accumulated Amortization	(59,802)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = geo_FacilityManagementContractsMember	(56,396)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = geo_FacilityManagementContractsMember
Net Carrying Amount	167,948us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = geo_FacilityManagementContractsMember	98,195us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = geo_FacilityManagementContractsMember
Technology
Schedule of Finite and Indefinite-Lived Intangible Assets [Line Items]
Weighted Average Useful Life (years)	7 years
Gross Carrying Amount	24,000us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TechnologyBasedIntangibleAssetsMember	24,000us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TechnologyBasedIntangibleAssetsMember
Accumulated Amortization	(12,977)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TechnologyBasedIntangibleAssetsMember	(12,120)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TechnologyBasedIntangibleAssetsMember
Net Carrying Amount	11,023us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TechnologyBasedIntangibleAssetsMember	11,880us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TechnologyBasedIntangibleAssetsMember
Trade names
Schedule of Finite and Indefinite-Lived Intangible Assets [Line Items]
Accumulated Amortization	0us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember	0us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember
Trade name (Indefinite lived)	$ 45,200us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember	$ 45,200us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember

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