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Debt (Narrative - Short-term notes payable and other borrowings) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2014	Jul. 31, 2014
Debt Instrument [Line Items]
Debt instrument amount	$ 22,000,000us-gaap_DebtInstrumentFaceAmount
Green Plains Grain [Member] | Revolving Line Of Credit [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Amount Outstanding	95,000,000us-gaap_LineOfCreditFacilityAmountOutstanding / dei_LegalEntityAxis = gpre_GreenPlainsGrainMember / us-gaap_LongtermDebtTypeAxis = gpre_RevolvingLineOfCreditMember	37,000,000us-gaap_LineOfCreditFacilityAmountOutstanding / dei_LegalEntityAxis = gpre_GreenPlainsGrainMember / us-gaap_LongtermDebtTypeAxis = gpre_RevolvingLineOfCreditMember
Green Plains Cattle [Member] | Revolving Line Of Credit [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Amount Outstanding		77,000,000us-gaap_LineOfCreditFacilityAmountOutstanding / dei_LegalEntityAxis = gpre_GreenPlainsCattleMember / us-gaap_LongtermDebtTypeAxis = gpre_RevolvingLineOfCreditMember
Green Plains Trade [Member] | Revolving Line Of Credit [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Amount Outstanding	76,500,000us-gaap_LineOfCreditFacilityAmountOutstanding / dei_LegalEntityAxis = gpre_GreenPlainsTradeMember / us-gaap_LongtermDebtTypeAxis = gpre_RevolvingLineOfCreditMember	95,900,000us-gaap_LineOfCreditFacilityAmountOutstanding / dei_LegalEntityAxis = gpre_GreenPlainsTradeMember / us-gaap_LongtermDebtTypeAxis = gpre_RevolvingLineOfCreditMember
Green Plains Fairmont and Green Plains Wood River [Member]
Debt Instrument [Line Items]
Debt instrument amount			$ 50,000,000us-gaap_DebtInstrumentFaceAmount / dei_LegalEntityAxis = gpre_GreenPlainsFairmontAndGreenPlainsWoodRiverMember

X

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 55

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400

+ Details

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	us-gaap_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount borrowed under the credit facility as of the balance sheet date.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

+ Details

Name:	us-gaap_LineOfCreditFacilityAmountOutstanding
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	dei_LegalEntityAxis=gpre_GreenPlainsCattleMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	dei_LegalEntityAxis=gpre_GreenPlainsFairmontAndGreenPlainsWoodRiverMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	dei_LegalEntityAxis=gpre_GreenPlainsGrainMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	dei_LegalEntityAxis=gpre_GreenPlainsTradeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: