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Acquisitions (Narrative) (Details) (USD $) | 0 Months Ended | 12 Months Ended | 0 Months Ended | 1 Months Ended |  |
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Sep. 26, 2014 | Sep. 16, 2013 | Mar. 28, 2012 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Nov. 13, 2014 | Jan. 31, 2012 | Jul. 22, 2013 Barges Tug_Boats | Jan. 03, 2012 Pipelines
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Partners' Capital Account, Public Sale of Units Net of Offering Costs | $ 225,725,000 us-gaap_PartnersCapitalAccountPublicSaleOfUnitsNetOfOfferingCosts | $ 263,574,000 us-gaap_PartnersCapitalAccountPublicSaleOfUnitsNetOfOfferingCosts | $ 169,421,000 us-gaap_PartnersCapitalAccountPublicSaleOfUnitsNetOfOfferingCosts |  |  |  |  |  |  |
Price per share of common units issued | $ 50.71 us-gaap_SaleOfStockPricePerShare | $ 47.51 us-gaap_SaleOfStockPricePerShare | $ 30.80 us-gaap_SaleOfStockPricePerShare |  |  |  |  |  |  |
Proceeds from issuance of senior unsecured notes, including premium |  |  |  | 350,000,000 us-gaap_ProceedsFromIssuanceOfUnsecuredDebt | 350,000,000 us-gaap_ProceedsFromIssuanceOfUnsecuredDebt | 101,000,000 us-gaap_ProceedsFromIssuanceOfUnsecuredDebt |  |  |  |
Cash paid for acquisition |  |  |  | 157,000,000 us-gaap_PaymentsToAcquireBusinessesGross | 230,880,000 us-gaap_PaymentsToAcquireBusinessesGross | 205,576,000 us-gaap_PaymentsToAcquireBusinessesGross |  |  |  |
Property, Plant and Equipment, Estimated Useful Lives |  |  |  | 25 |  |  |  |  |  |
American Phoenix Acquisition [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Effective date of acquisition |  |  |  |  |  |  | Nov. 13, 2014 |  |  |
Transaction costs related to business acquisition |  |  |  |  |  |  | 157,000,000 us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts / us-gaap_BusinessAcquisitionAxis = gel_AmericanPhoenixAcquisitionMember |  |  |
Hornbeck Acquisition [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Number of barges acquired |  |  |  |  |  |  |  |  | 9 gel_BusinessAcquisitionBargesAcquired / us-gaap_BusinessAcquisitionAxis = gel_HornbeckAcquisitionMember |
Business Acquisition, Tug Boats Acquired |  |  |  |  |  |  |  |  | 9 gel_BusinessAcquisitionTugBoatsAcquired / us-gaap_BusinessAcquisitionAxis = gel_HornbeckAcquisitionMember |
Transaction costs related to business acquisition |  |  |  |  |  |  |  |  | $ 230,900,000 us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts / us-gaap_BusinessAcquisitionAxis = gel_HornbeckAcquisitionMember |
Gulf Of Mexico Crude Oil Pipeline Systems [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Effective date of acquisition |  |  |  |  |  |  |  | Jan. 03, 2012 |  |
Poseidon Oil Pipeline Company, L.L.C. [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  | 28.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gel_PoseidonOilPipelineCompanyMember |  |  |  |  |  |
Marathon Offshore Pipeline, LLC [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  | 100.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gel_MarathonOffshorePipelineLlcMember |  |  |  |  |  |
Odyssey Pipeline L.L.C. [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  | 29.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gel_OdysseyPipelineLLCMember |  |  |  |  |  |
Eugene Island Pipeline System [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  | 23.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gel_EugeneIslandPipelineSystemMember |  |  |  |  |  |
Two Offshore Smaller Pipelines [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  | 100.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gel_TwoOffshoreSmallerPipelinesMember |  |  |  |  |  |
Number of piepelines |  |  |  |  |  |  |  |  |  | 2 gel_NumberOfPipelines / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gel_TwoOffshoreSmallerPipelinesMember
CHOPS [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  | 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gel_ChopsMember |  |  |  |  |  |

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