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Segment Information (Schedule Of Revenues By Product) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Revenues	$ 829,939us-gaap_Revenues	$ 833,925us-gaap_Revenues	$ 837,858us-gaap_Revenues	$ 733,889us-gaap_Revenues	$ 712,869us-gaap_Revenues	$ 757,971us-gaap_Revenues	$ 804,696us-gaap_Revenues	$ 765,476us-gaap_Revenues	$ 3,235,611us-gaap_Revenues	$ 3,041,011us-gaap_Revenues	$ 3,476,870us-gaap_Revenues
Ethanol [Member]
Segment Reporting Information [Line Items]
Revenues									2,362,812us-gaap_Revenues / gpre_ProductLinesAxis = gpre_EthanolMember	2,339,470us-gaap_Revenues / gpre_ProductLinesAxis = gpre_EthanolMember	2,507,119us-gaap_Revenues / gpre_ProductLinesAxis = gpre_EthanolMember
Distillers Grains [Member]
Segment Reporting Information [Line Items]
Revenues									531,696us-gaap_Revenues / gpre_ProductLinesAxis = gpre_DistillersGrainsMember	488,396us-gaap_Revenues / gpre_ProductLinesAxis = gpre_DistillersGrainsMember	433,088us-gaap_Revenues / gpre_ProductLinesAxis = gpre_DistillersGrainsMember
Corn Oil [Member]
Segment Reporting Information [Line Items]
Revenues									99,167us-gaap_Revenues / gpre_ProductLinesAxis = gpre_CornOilMember	74,251us-gaap_Revenues / gpre_ProductLinesAxis = gpre_CornOilMember	58,640us-gaap_Revenues / gpre_ProductLinesAxis = gpre_CornOilMember
Grain [Member]
Segment Reporting Information [Line Items]
Revenues									174,997us-gaap_Revenues / gpre_ProductLinesAxis = gpre_GrainMember	92,487us-gaap_Revenues / gpre_ProductLinesAxis = gpre_GrainMember	348,413us-gaap_Revenues / gpre_ProductLinesAxis = gpre_GrainMember
Other [Member]
Segment Reporting Information [Line Items]
Revenues									$ 66,939us-gaap_Revenues / gpre_ProductLinesAxis = us-gaap_AllOtherSegmentsMember	$ 46,407us-gaap_Revenues / gpre_ProductLinesAxis = us-gaap_AllOtherSegmentsMember	$ 129,610us-gaap_Revenues / gpre_ProductLinesAxis = us-gaap_AllOtherSegmentsMember

X

- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

+ Details

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