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Acquisition (Narrative) (Details) (USD $) | 0 Months Ended |  |
--- | --- | --- | ---
Nov. 13, 2014 | Mar. 31, 2015 | Dec. 31, 2014
Business Acquisition [Line Items] |  |  |
Long-term Debt, Fair Value |  | $ 1,000,000,000 us-gaap_LongTermDebtFairValue | $ 1,000,000,000 us-gaap_LongTermDebtFairValue
American Phoenix Acquisition [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Property, Plant and Equipment, Useful Life | 30 years |  |
Business Acquisition, Effective Date of Acquisition | Nov. 13, 2014 |  |
Business Acquisition, Transaction Costs | $ 157,000,000 us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts / us-gaap_BusinessAcquisitionAxis = gel_AmericanPhoenixAcquisitionMember |  |
Business Acquisition, Cargo Capacity | 330,000 gel_BusinessAcquisitionCargoCapacity / us-gaap_BusinessAcquisitionAxis = gel_AmericanPhoenixAcquisitionMember |  |

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- Definition Business Acquisition, Cargo Capacity in Barrels + References No definition available. + Details
Name: | gel_BusinessAcquisitionCargoCapacity
Namespace Prefix: | gel_
Data Type: | num:volumeItemType
Balance Type: | na
Period Type: | instant

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- Definition Amount of direct costs of the business combination including legal, accounting, and other costs incurred to consummate the business acquisition. + References No definition available. + Details
Name: | us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Date when the acquirer obtains control of the acquiree, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=34752592&loc=d3e845-128460 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Acquisition Date -URI http://asc.fasb.org/extlink&oid=6919109 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=34752592&loc=d3e848-128460 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
Name: | us-gaap_BusinessAcquisitionEffectiveDateOfAcquisition1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_BusinessAcquisitionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
Name: | us-gaap_LongTermDebtFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentUsefulLife
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_BusinessAcquisitionAxis=gel_AmericanPhoenixAcquisitionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |