XML 28 R57.htm IDEA: XBRL DOCUMENT v2.4.1.9

Goodwill (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Goodwill [Line Items]
Goodwill	$ 40,877us-gaap_Goodwill	$ 40,877us-gaap_Goodwill
Ethanol Production [Member]
Goodwill [Line Items]
Goodwill	30,300us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = gpre_EthanolProductionMember
Marketing And Distribution [Member]
Goodwill [Line Items]
Goodwill	$ 10,600us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = gpre_MarketingAndDistributionMember

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

+ Details

Name:	us-gaap_Goodwill
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

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

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=gpre_EthanolProductionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=gpre_MarketingAndDistributionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: