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Acquisitions and Dispositions (Narrative) (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 gal | Dec. 31, 2013 | Dec. 31, 2012
Disposition Of Assets [Line Items] |  |  |
Cash proceeds from sale of grain elevators | $ 9,258,000 us-gaap_ProceedsFromSaleOfProductiveAssets | $ 245,000 us-gaap_ProceedsFromSaleOfProductiveAssets | $ 117,711,000 us-gaap_ProceedsFromSaleOfProductiveAssets
Pre-tax gain from sale of grain elevators |  |  | 47,133,000 us-gaap_GainLossOnDispositionOfAssets
Expected annual ethanol production capacity | 1,000,000,000 gpre_ExpectedAnnualEthanolProduction |  |
Purchase price of acquisition | 23,900,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet | 123,301,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet | 1,490,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet
Cash equity utilized to reduce outstanding debt | 557,850,000 us-gaap_RepaymentsOfLongTermDebt | 303,495,000 us-gaap_RepaymentsOfLongTermDebt | 120,153,000 us-gaap_RepaymentsOfLongTermDebt
Disposed Asset [Member] |  |  |
Disposition Of Assets [Line Items] |  |  |
Number of grain elevators sold in divestiture | 12 gpre_NumberOfGrainElevatorsSold / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = gpre_DisposedAssetMember |  |
Grain elevator storage capacity, bushels | 32,600,000 gpre_GrainElevatorStorageCapacity / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = gpre_DisposedAssetMember |  |
Percent of agribusiness grain storage capacity | 83.00%gpre_PercentOfAgribusinessGrainStorageCapacity / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = gpre_DisposedAssetMember |  |
Gross proceeds from the sale, including the assumptions of debt, current liabilities and fees | 241,000,000 gpre_ProceedsFromSaleOfProductiveAssetsGross / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = gpre_DisposedAssetMember |  |
Cash proceeds from sale of grain elevators | 117,700,000 us-gaap_ProceedsFromSaleOfProductiveAssets / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = gpre_DisposedAssetMember |  |
Pre-tax gain from sale of grain elevators | 47,100,000 us-gaap_GainLossOnDispositionOfAssets / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = gpre_DisposedAssetMember |  |
Acquisition Of Green Plains Fairmont and Green Plains Wood River [Member] |  |  |
Disposition Of Assets [Line Items] |  |  |
Expected annual ethanol production capacity | 230,000,000 gpre_ExpectedAnnualEthanolProduction / us-gaap_BusinessAcquisitionAxis = gpre_AcquisitionOfGreenPlainsFairmontAndGreenPlainsWoodRiverMember |  |
Cash paid for business acquisition | 114,300,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = gpre_AcquisitionOfGreenPlainsFairmontAndGreenPlainsWoodRiverMember |  |
Transaction Costs | 800,000 us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAdditionalDisclosuresAcquisitionCosts / us-gaap_BusinessAcquisitionAxis = gpre_AcquisitionOfGreenPlainsFairmontAndGreenPlainsWoodRiverMember |  |
Notes Payable | 77,000,000 us-gaap_NotesPayable / us-gaap_BusinessAcquisitionAxis = gpre_AcquisitionOfGreenPlainsFairmontAndGreenPlainsWoodRiverMember |  |
Number of ethanol plants | 2 gpre_NumberOfEthanolPlants / us-gaap_BusinessAcquisitionAxis = gpre_AcquisitionOfGreenPlainsFairmontAndGreenPlainsWoodRiverMember |  |
Consolidated pro forma revenue |  | 3,300,000,000 us-gaap_BusinessAcquisitionsProFormaRevenue / us-gaap_BusinessAcquisitionAxis = gpre_AcquisitionOfGreenPlainsFairmontAndGreenPlainsWoodRiverMember |
Consolidated pro forma net income |  | 47,700,000 us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss / us-gaap_BusinessAcquisitionAxis = gpre_AcquisitionOfGreenPlainsFairmontAndGreenPlainsWoodRiverMember |
Capital Lease Obligations Incurred | $ 10,000,000 us-gaap_CapitalLeaseObligationsIncurred / us-gaap_BusinessAcquisitionAxis = gpre_AcquisitionOfGreenPlainsFairmontAndGreenPlainsWoodRiverMember |  |

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