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v2.4.1.9

Related Party Transactions (Narrative) (Details) (USD $) | 0 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jan. 01, 2015 | Mar. 31, 2014 | Dec. 31, 2014 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Related Party Transaction [Line Items] |  |  |  |  |  |
Outstanding accounts payable |  |  | $ 170,199,000 us-gaap_AccountsPayableCurrent | $ 170,199,000 us-gaap_AccountsPayableCurrent | $ 112,001,000 us-gaap_AccountsPayableCurrent |
AXIS Capital [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Outstanding note payable |  |  | 1,400,000 us-gaap_NotesPayable / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = gpre_AxisCapitalMember | 1,400,000 us-gaap_NotesPayable / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = gpre_AxisCapitalMember |  |
Debt included in financing arrangements |  |  | 1,200,000 us-gaap_DueToRelatedPartiesCurrentAndNoncurrent / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = gpre_AxisCapitalMember | 1,200,000 us-gaap_DueToRelatedPartiesCurrentAndNoncurrent / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = gpre_AxisCapitalMember | 100,000 us-gaap_DueToRelatedPartiesCurrentAndNoncurrent / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = gpre_AxisCapitalMember |
Principal payments (plus interest) |  |  |  | 300,000 us-gaap_DebtInstrumentPeriodicPayment / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = gpre_AxisCapitalMember | 100,000 us-gaap_DebtInstrumentPeriodicPayment / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = gpre_AxisCapitalMember | 300,000 us-gaap_DebtInstrumentPeriodicPayment / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = gpre_AxisCapitalMember
Weighted average interest rate |  |  | 6.80%us-gaap_DebtWeightedAverageInterestRate / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = gpre_AxisCapitalMember | 6.80%us-gaap_DebtWeightedAverageInterestRate / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = gpre_AxisCapitalMember |  |
Hoovestol Inc [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Cash payments |  |  |  | 187,000 us-gaap_PaymentsToSuppliersAndEmployees / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = gpre_HoovestolIncMember | 136,000 us-gaap_PaymentsToSuppliersAndEmployees / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = gpre_HoovestolIncMember | 121,000 us-gaap_PaymentsToSuppliersAndEmployees / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = gpre_HoovestolIncMember
Outstanding accounts payable |  |  | 2,000 us-gaap_AccountsPayableCurrent / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = gpre_HoovestolIncMember | 2,000 us-gaap_AccountsPayableCurrent / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = gpre_HoovestolIncMember |  |
Aircraft lease amount payable, per month | $ 9,766 us-gaap_AircraftRental / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = gpre_HoovestolIncMember | $ 6,667 us-gaap_AircraftRental / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = gpre_HoovestolIncMember | $ 15,834 us-gaap_AircraftRental / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = gpre_HoovestolIncMember |  |  |
Aircraft hours available each month under lease | 125 gpre_AircraftUsingHours / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = gpre_HoovestolIncMember | 100 gpre_AircraftUsingHours / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = gpre_HoovestolIncMember | 125 gpre_AircraftUsingHours / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = gpre_HoovestolIncMember |  |  |

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- Definition Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19 -Subparagraph a -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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