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Schedule I - Condensed Financial Information Of The Registrant (Condensed Financial Information Of The Registrant Statements Of Cash Flows - Parent Company Only) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Net Cash Provided by (Used in) Operating Activities [Abstract] |  |  |
Net cash provided (used) by operating activities | $ 221,550 us-gaap_NetCashProvidedByUsedInOperatingActivities | $ 107,336 us-gaap_NetCashProvidedByUsedInOperatingActivities | $ (13,724)us-gaap_NetCashProvidedByUsedInOperatingActivities
Cash flows from investing activities: |  |  |
Purchases of property and equipment | (59,547)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment | (19,764)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment | (26,776)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Proceeds on disposal of assets, net | 9,258 us-gaap_ProceedsFromSaleOfProductiveAssets | 245 us-gaap_ProceedsFromSaleOfProductiveAssets | 117,711 us-gaap_ProceedsFromSaleOfProductiveAssets
Net cash provided (used) by investing activities | (78,595)us-gaap_NetCashProvidedByUsedInInvestingActivities | (147,584)us-gaap_NetCashProvidedByUsedInInvestingActivities | 81,447 us-gaap_NetCashProvidedByUsedInInvestingActivities
Cash flows from financing activities: |  |  |
Proceeds from the issuance of long-term debt | 542,692 us-gaap_ProceedsFromIssuanceOfLongTermDebt | 343,799 us-gaap_ProceedsFromIssuanceOfLongTermDebt | 73,100 us-gaap_ProceedsFromIssuanceOfLongTermDebt
Payments of principal on long-term debt | (557,850)us-gaap_RepaymentsOfLongTermDebt | (303,495)us-gaap_RepaymentsOfLongTermDebt | (120,153)us-gaap_RepaymentsOfLongTermDebt
Payments on short-term borrowings | (3,670,529)us-gaap_RepaymentsOfShortTermDebt | (3,321,556)us-gaap_RepaymentsOfShortTermDebt | (3,249,371)us-gaap_RepaymentsOfShortTermDebt
Payments for repurchase of common stock |  |  | (10,445)us-gaap_PaymentsForRepurchaseOfCommonStock
Change in restricted cash | (547)gpre_IncreasesDecreasesInRestrictedCash | (1,298)gpre_IncreasesDecreasesInRestrictedCash | (6,196)gpre_IncreasesDecreasesInRestrictedCash
Payment of cash dividends | (8,908)us-gaap_PaymentsOfDividendsCommonStock | (2,426)us-gaap_PaymentsOfDividendsCommonStock |
Payments of loan fees | (7,630)us-gaap_PaymentsOfLoanCosts | (10,046)us-gaap_PaymentsOfLoanCosts | (332)us-gaap_PaymentsOfLoanCosts
Proceeds from the exercise of stock options and warrants | 4,404 gpre_ProceedsFromExerciseOfStockOptionsAndWarrants | 4,498 gpre_ProceedsFromExerciseOfStockOptionsAndWarrants | 452 gpre_ProceedsFromExerciseOfStockOptionsAndWarrants
Net cash provided (used) by financing activities | 10,528 us-gaap_NetCashProvidedByUsedInFinancingActivities | 57,986 us-gaap_NetCashProvidedByUsedInFinancingActivities | 11,578 us-gaap_NetCashProvidedByUsedInFinancingActivities
Net change in cash and cash equivalents | 153,483 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease | 17,738 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease | 79,301 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents, beginning of period | 272,027 us-gaap_CashAndCashEquivalentsAtCarryingValue | 254,289 us-gaap_CashAndCashEquivalentsAtCarryingValue | 174,988 us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents, end of period | 425,510 us-gaap_CashAndCashEquivalentsAtCarryingValue | 272,027 us-gaap_CashAndCashEquivalentsAtCarryingValue | 254,289 us-gaap_CashAndCashEquivalentsAtCarryingValue
Green Plains Inc. [Member] |  |  |
Net Cash Provided by (Used in) Operating Activities [Abstract] |  |  |
Net cash provided (used) by operating activities | (7,653)us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (1,924)us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (279)us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Cash flows from investing activities: |  |  |
Purchases of property and equipment | (2,829)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (652)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (616)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Proceeds on disposal of assets, net |  | 42 us-gaap_ProceedsFromSaleOfProductiveAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Investment in subsidiaries | 125,179 gpre_IncreaseDecreaseInInvestmentInSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (53,754)gpre_IncreaseDecreaseInInvestmentInSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 54,426 gpre_IncreaseDecreaseInInvestmentInSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Issuance of notes receivable from subsidiaries, net of payments received | 9,500 gpre_IssuanceOfNotesReceivableFromSubsidiariesNetOfPaymentsReceived / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 15,356 gpre_IssuanceOfNotesReceivableFromSubsidiariesNetOfPaymentsReceived / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (6,832)gpre_IssuanceOfNotesReceivableFromSubsidiariesNetOfPaymentsReceived / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Other, net | (4,309)us-gaap_PaymentsForProceedsFromOtherInvestingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (3,264)us-gaap_PaymentsForProceedsFromOtherInvestingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (7,998)us-gaap_PaymentsForProceedsFromOtherInvestingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net cash provided (used) by investing activities | 127,541 us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (42,272)us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 38,980 us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Cash flows from financing activities: |  |  |
Proceeds from the issuance of long-term debt |  | 120,000 us-gaap_ProceedsFromIssuanceOfLongTermDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Payments of principal on long-term debt | (238)us-gaap_RepaymentsOfLongTermDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (1,841)us-gaap_RepaymentsOfLongTermDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (204)us-gaap_RepaymentsOfLongTermDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Payments on short-term borrowings |  | (27,162)us-gaap_RepaymentsOfShortTermDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Payments for repurchase of common stock |  |  | (10,445)us-gaap_PaymentsForRepurchaseOfCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Change in restricted cash | (6,309)gpre_IncreasesDecreasesInRestrictedCash / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Payment of cash dividends | (8,908)us-gaap_PaymentsOfDividendsCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (2,426)us-gaap_PaymentsOfDividendsCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Payments of loan fees |  | (5,072)us-gaap_PaymentsOfLoanCosts / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Proceeds from the exercise of stock options and warrants | 4,404 gpre_ProceedsFromExerciseOfStockOptionsAndWarrants / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 4,498 gpre_ProceedsFromExerciseOfStockOptionsAndWarrants / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Other, net |  |  | 452 us-gaap_ProceedsFromPaymentsForOtherFinancingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net cash provided (used) by financing activities | (11,051)us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 87,997 us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (10,197)us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net change in cash and cash equivalents | 108,837 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 43,801 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 28,504 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Cash and cash equivalents, beginning of period | 143,852 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 100,051 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 71,547 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Cash and cash equivalents, end of period | $ 252,689 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 143,852 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 100,051 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember

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- Definition Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3574-108585 + Details
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