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Segment Information (Summary Of Total Assets For Operating Segments) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Segment Reporting Information [Line Items] |  |
Total assets | $ 1,828,557 us-gaap_Assets | $ 1,532,045 us-gaap_Assets
Ethanol Production [Member] |  |
Segment Reporting Information [Line Items] |  |
Total assets | 983,289 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = gpre_EthanolProductionMember | 911,315 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = gpre_EthanolProductionMember
Corn Oil Production [Member] |  |
Segment Reporting Information [Line Items] |  |
Total assets | 31,405 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = gpre_CornOilProductionMember | 28,569 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = gpre_CornOilProductionMember
Agribusiness [Member] |  |
Segment Reporting Information [Line Items] |  |
Total assets | 234,626 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = gpre_AgribusinessMember | 165,570 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = gpre_AgribusinessMember
Marketing And Distribution [Member] |  |
Segment Reporting Information [Line Items] |  |
Total assets | 305,675 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = gpre_MarketingAndDistributionMember | 258,361 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = gpre_MarketingAndDistributionMember
Corporate Assets [Member] |  |
Segment Reporting Information [Line Items] |  |
Total assets | 290,123 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = gpre_CorporateAssetsMember | 175,210 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = gpre_CorporateAssetsMember
Intersegment Eliminations [Member] |  |
Segment Reporting Information [Line Items] |  |
Total assets | $ (16,561)us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_IntersegmentEliminationMember | $ (6,980)us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_IntersegmentEliminationMember

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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.18) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 12 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 18 -Article 5 + Details
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