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Schedule III - Real Estate and Accumulated Depreciation (Details 2) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Jan. 02, 2011
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Federal income tax purposes $ 1,400,000,000us-gaap_RealEstateFederalIncomeTaxBasis      
Real Estate:        
Beginning balance 1,935,556,000us-gaap_RealEstateGrossAtCarryingValue   1,840,306,000us-gaap_RealEstateGrossAtCarryingValue 1,805,434,000us-gaap_RealEstateGrossAtCarryingValue
Additions to/improvements of real estate 94,521,000geo_RealEstateAdditionsandImprovements 97,302,000geo_RealEstateAdditionsandImprovements 51,998,000geo_RealEstateAdditionsandImprovements  
Assets sold/written-off (3,205,000)geo_RealEstateAssetsSoldandWriteOffs (2,052,000)geo_RealEstateAssetsSoldandWriteOffs (17,126,000)geo_RealEstateAssetsSoldandWriteOffs  
Ending balance 2,026,872,000us-gaap_RealEstateGrossAtCarryingValue 1,935,556,000us-gaap_RealEstateGrossAtCarryingValue   1,805,434,000us-gaap_RealEstateGrossAtCarryingValue
Accumulated Depreciation        
Beginning balance 266,848,000us-gaap_RealEstateAccumulatedDepreciation   217,428,000us-gaap_RealEstateAccumulatedDepreciation 174,055,000us-gaap_RealEstateAccumulatedDepreciation
Depreciation expense 53,182,000us-gaap_SECScheduleIIIRealEstateAccumulatedDepreciationDepreciationExpense 50,616,000us-gaap_SECScheduleIIIRealEstateAccumulatedDepreciationDepreciationExpense 49,026,000us-gaap_SECScheduleIIIRealEstateAccumulatedDepreciationDepreciationExpense  
Assets sold/written-off (2,446,000)us-gaap_RealEstateAccumulatedDepreciationRealEstateSold (1,196,000)us-gaap_RealEstateAccumulatedDepreciationRealEstateSold (5,653,000)us-gaap_RealEstateAccumulatedDepreciationRealEstateSold  
Ending balance $ 317,584,000us-gaap_RealEstateAccumulatedDepreciation $ 266,848,000us-gaap_RealEstateAccumulatedDepreciation   $ 174,055,000us-gaap_RealEstateAccumulatedDepreciation
Land improvements        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Useful life 7 years      
Building        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Useful life 50 years      
Buildings and improvements | Minimum        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Useful life 7 years      
Buildings and improvements | Maximum        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Useful life 15 years      
Leasehold improvements        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Useful life 15 years