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Basis Of Presentation And Description Of Business (Narrative) (Details)	12 Months Ended
	Dec. 31, 2014 segment gal
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Number of operating segments	4us-gaap_NumberOfOperatingSegments
Annual ethanol production capacity, gallons	1,000,000,000gpre_ExpectedAnnualEthanolProduction
Ethanol Production Segment [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Number of ethanol plants	12
Annual corn consumption capacity, bushels	360,000,000
Annual distillers grains production capacity, tons	2,900,000
Corn Oil Production Segment [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Annual corn oil production, pounds	250,000,000
Agribusiness Segment [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total Grain Storage Capacity	42,200,000
Ethanol plants, storage capacity, bushels	29,400,000
Grain elevator storage capacity, bushels	9,000,000
Number of grain elevators	4
Cattle Grain Storage Capacity	3,800,000
Head of Cattle Capacity	70,000
Marketing And Distribution Segment [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Number of blending and terminaling facilities	8
Number of states, in south central U.S., served by BlendStar LLC blending and terminaling facilities	7
Blending and terminaling throughput capacity, gallons	822,000,000