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Derivative Financial Instruments (Schedule Of Volumes Of Open Commodity Derivative Positions) (Details)
Dec. 31, 2014
contract
Futures [Member] | Exchange Traded Net Long & Short [Member] | Corn, Soybeans And Wheat In Bushels [Member]  
Derivative [Line Items]  
Volumes of open commodity derivatives (4,410,000)invest_DerivativeNonmonetaryNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= us-gaap_FutureMember
/ gpre_DerivativeInstrumentsByDerivativeInstrumentTypeAxis
= gpre_CornSoybeansAndWheatInBushelsMember
/ us-gaap_TradingActivityByTypeAxis
= gpre_ExchangeTradedNetLongAndShortMember
Futures [Member] | Exchange Traded Net Long & Short [Member] | Corn In Bushels [Member] | Cash Flow Hedges [Member]  
Derivative [Line Items]  
Volumes of open commodity derivatives 3,675,000invest_DerivativeNonmonetaryNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= us-gaap_FutureMember
/ gpre_DerivativeInstrumentsByDerivativeInstrumentTypeAxis
= gpre_CornInBushelsMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_TradingActivityByTypeAxis
= gpre_ExchangeTradedNetLongAndShortMember		 [1]
Futures [Member] | Exchange Traded Net Long & Short [Member] | Corn In Bushels [Member] | Fair Value Hedging [Member]  
Derivative [Line Items]  
Volumes of open commodity derivatives (9,010,000)invest_DerivativeNonmonetaryNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= us-gaap_FutureMember
/ gpre_DerivativeInstrumentsByDerivativeInstrumentTypeAxis
= gpre_CornInBushelsMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_FairValueHedgingMember
/ us-gaap_TradingActivityByTypeAxis
= gpre_ExchangeTradedNetLongAndShortMember		 [2]
Futures [Member] | Exchange Traded Net Long & Short [Member] | Ethanol In Gallons [Member]  
Derivative [Line Items]  
Volumes of open commodity derivatives 46,410,000invest_DerivativeNonmonetaryNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= us-gaap_FutureMember
/ gpre_DerivativeInstrumentsByDerivativeInstrumentTypeAxis
= gpre_EthanolInGallonsMember
/ us-gaap_TradingActivityByTypeAxis
= gpre_ExchangeTradedNetLongAndShortMember
Futures [Member] | Exchange Traded Net Long & Short [Member] | Ethanol In Gallons [Member] | Cash Flow Hedges [Member]  
Derivative [Line Items]  
Volumes of open commodity derivatives (82,950,000)invest_DerivativeNonmonetaryNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= us-gaap_FutureMember
/ gpre_DerivativeInstrumentsByDerivativeInstrumentTypeAxis
= gpre_EthanolInGallonsMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_TradingActivityByTypeAxis
= gpre_ExchangeTradedNetLongAndShortMember		 [1]
Futures [Member] | Exchange Traded Net Long & Short [Member] | Natural Gas In mmBTU [Member]  
Derivative [Line Items]  
Volumes of open commodity derivatives 958,000invest_DerivativeNonmonetaryNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= us-gaap_FutureMember
/ gpre_DerivativeInstrumentsByDerivativeInstrumentTypeAxis
= gpre_NaturalGasInMmbtuMember
/ us-gaap_TradingActivityByTypeAxis
= gpre_ExchangeTradedNetLongAndShortMember
Futures [Member] | Exchange Traded Net Long & Short [Member] | Natural Gas In mmBTU [Member] | Fair Value Hedging [Member]  
Derivative [Line Items]  
Volumes of open commodity derivatives (4,318,000)invest_DerivativeNonmonetaryNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= us-gaap_FutureMember
/ gpre_DerivativeInstrumentsByDerivativeInstrumentTypeAxis
= gpre_NaturalGasInMmbtuMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_FairValueHedgingMember
/ us-gaap_TradingActivityByTypeAxis
= gpre_ExchangeTradedNetLongAndShortMember		 [2]
Futures [Member] | Exchange Traded Net Long & Short [Member] | Cattle In Pounds [Member]  
Derivative [Line Items]  
Volumes of open commodity derivatives 1,320,000invest_DerivativeNonmonetaryNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= us-gaap_FutureMember
/ gpre_DerivativeInstrumentsByDerivativeInstrumentTypeAxis
= gpre_CattleInPoundsMember
/ us-gaap_TradingActivityByTypeAxis
= gpre_ExchangeTradedNetLongAndShortMember
Futures [Member] | Exchange Traded Net Long & Short [Member] | Cattle In Pounds [Member] | Cash Flow Hedges [Member]  
Derivative [Line Items]  
Volumes of open commodity derivatives (37,040,000)invest_DerivativeNonmonetaryNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= us-gaap_FutureMember
/ gpre_DerivativeInstrumentsByDerivativeInstrumentTypeAxis
= gpre_CattleInPoundsMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_TradingActivityByTypeAxis
= gpre_ExchangeTradedNetLongAndShortMember		 [1]
Futures [Member] | Exchange Traded Net Long & Short [Member] | Soybean Oil in Pounds [Member]  
Derivative [Line Items]  
Volumes of open commodity derivatives (2,700,000)invest_DerivativeNonmonetaryNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= us-gaap_FutureMember
/ gpre_DerivativeInstrumentsByDerivativeInstrumentTypeAxis
= gpre_SoybeanOilInPoundsMember
/ us-gaap_TradingActivityByTypeAxis
= gpre_ExchangeTradedNetLongAndShortMember
Options [Member] | Exchange Traded Net Long & Short [Member] | Corn, Soybeans And Wheat In Bushels [Member]  
Derivative [Line Items]  
Volumes of open commodity derivatives (2,461,000)invest_DerivativeNonmonetaryNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= us-gaap_OptionMember
/ gpre_DerivativeInstrumentsByDerivativeInstrumentTypeAxis
= gpre_CornSoybeansAndWheatInBushelsMember
/ us-gaap_TradingActivityByTypeAxis
= gpre_ExchangeTradedNetLongAndShortMember
Options [Member] | Exchange Traded Net Long & Short [Member] | Ethanol In Gallons [Member]  
Derivative [Line Items]  
Volumes of open commodity derivatives (15,095,000)invest_DerivativeNonmonetaryNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= us-gaap_OptionMember
/ gpre_DerivativeInstrumentsByDerivativeInstrumentTypeAxis
= gpre_EthanolInGallonsMember
/ us-gaap_TradingActivityByTypeAxis
= gpre_ExchangeTradedNetLongAndShortMember
Options [Member] | Exchange Traded Net Long & Short [Member] | Natural Gas In mmBTU [Member]  
Derivative [Line Items]  
Volumes of open commodity derivatives (30,000)invest_DerivativeNonmonetaryNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= us-gaap_OptionMember
/ gpre_DerivativeInstrumentsByDerivativeInstrumentTypeAxis
= gpre_NaturalGasInMmbtuMember
/ us-gaap_TradingActivityByTypeAxis
= gpre_ExchangeTradedNetLongAndShortMember
Forwards [Member] | Non-Exchange Traded Long [Member] | Ethanol In Gallons [Member]  
Derivative [Line Items]  
Volumes of open commodity derivatives 8,046,000invest_DerivativeNonmonetaryNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= us-gaap_ForwardContractsMember
/ gpre_DerivativeInstrumentsByDerivativeInstrumentTypeAxis
= gpre_EthanolInGallonsMember
/ us-gaap_TradingActivityByTypeAxis
= gpre_NonExchangeTradedLongMember		 [3]
Forwards [Member] | Non-Exchange Traded Long [Member] | Natural Gas In mmBTU [Member]  
Derivative [Line Items]  
Volumes of open commodity derivatives 9,310,000invest_DerivativeNonmonetaryNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= us-gaap_ForwardContractsMember
/ gpre_DerivativeInstrumentsByDerivativeInstrumentTypeAxis
= gpre_NaturalGasInMmbtuMember
/ us-gaap_TradingActivityByTypeAxis
= gpre_NonExchangeTradedLongMember		 [3]
Forwards [Member] | Non-Exchange Traded Long [Member] | Corn And Soybeans In Bushels [Member]  
Derivative [Line Items]  
Volumes of open commodity derivatives 19,041,000invest_DerivativeNonmonetaryNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= us-gaap_ForwardContractsMember
/ gpre_DerivativeInstrumentsByDerivativeInstrumentTypeAxis
= gpre_CornAndSoybeansInBushelsMember
/ us-gaap_TradingActivityByTypeAxis
= gpre_NonExchangeTradedLongMember		 [3]
Forwards [Member] | Non-Exchange Traded Long [Member] | Distillers Grains In Tons [Member]  
Derivative [Line Items]  
Volumes of open commodity derivatives 104,000invest_DerivativeNonmonetaryNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= us-gaap_ForwardContractsMember
/ gpre_DerivativeInstrumentsByDerivativeInstrumentTypeAxis
= gpre_DistillersGrainsInTonsMember
/ us-gaap_TradingActivityByTypeAxis
= gpre_NonExchangeTradedLongMember		 [3]
Forwards [Member] | Non-Exchange Traded Long [Member] | Corn Oil in Pounds [Member]  
Derivative [Line Items]  
Volumes of open commodity derivatives 3,744,000invest_DerivativeNonmonetaryNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= us-gaap_ForwardContractsMember
/ gpre_DerivativeInstrumentsByDerivativeInstrumentTypeAxis
= gpre_CornOilInPoundsMember
/ us-gaap_TradingActivityByTypeAxis
= gpre_NonExchangeTradedLongMember		 [3]
Forwards [Member] | Non-Exchange Traded Short [Member] | Ethanol In Gallons [Member]  
Derivative [Line Items]  
Volumes of open commodity derivatives (160,901,000)invest_DerivativeNonmonetaryNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= us-gaap_ForwardContractsMember
/ gpre_DerivativeInstrumentsByDerivativeInstrumentTypeAxis
= gpre_EthanolInGallonsMember
/ us-gaap_TradingActivityByTypeAxis
= gpre_NonExchangeTradedShortMember		 [3]
Forwards [Member] | Non-Exchange Traded Short [Member] | Natural Gas In mmBTU [Member]  
Derivative [Line Items]  
Volumes of open commodity derivatives (876,000)invest_DerivativeNonmonetaryNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= us-gaap_ForwardContractsMember
/ gpre_DerivativeInstrumentsByDerivativeInstrumentTypeAxis
= gpre_NaturalGasInMmbtuMember
/ us-gaap_TradingActivityByTypeAxis
= gpre_NonExchangeTradedShortMember		 [3]
Forwards [Member] | Non-Exchange Traded Short [Member] | Corn And Soybeans In Bushels [Member]  
Derivative [Line Items]  
Volumes of open commodity derivatives (16,251,000)invest_DerivativeNonmonetaryNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= us-gaap_ForwardContractsMember
/ gpre_DerivativeInstrumentsByDerivativeInstrumentTypeAxis
= gpre_CornAndSoybeansInBushelsMember
/ us-gaap_TradingActivityByTypeAxis
= gpre_NonExchangeTradedShortMember		 [3]
Forwards [Member] | Non-Exchange Traded Short [Member] | Distillers Grains In Tons [Member]  
Derivative [Line Items]  
Volumes of open commodity derivatives (461,000)invest_DerivativeNonmonetaryNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= us-gaap_ForwardContractsMember
/ gpre_DerivativeInstrumentsByDerivativeInstrumentTypeAxis
= gpre_DistillersGrainsInTonsMember
/ us-gaap_TradingActivityByTypeAxis
= gpre_NonExchangeTradedShortMember		 [3]
Forwards [Member] | Non-Exchange Traded Short [Member] | Corn Oil in Pounds [Member]  
Derivative [Line Items]  
Volumes of open commodity derivatives (60,490,000)invest_DerivativeNonmonetaryNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= us-gaap_ForwardContractsMember
/ gpre_DerivativeInstrumentsByDerivativeInstrumentTypeAxis
= gpre_CornOilInPoundsMember
/ us-gaap_TradingActivityByTypeAxis
= gpre_NonExchangeTradedShortMember		 [3]
[1] Futures used for cash flow hedges.
[2] Futures used for fair value hedges
[3] Non-exchange traded forwards are presented on a gross long and (short) position basis including both fixed-price and basis contracts.