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Lease Accounting (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Leases [Abstract] |  |  |  |
Operating lease costs | $ 41,400 | $ 13,600 | $ 18,400 |
Mileage credits | 22,500 | 22,400 | 20,800 |
Acquired fixed assets, useful life | $ 0 | $ (671) | $ (598) |
Direct finance lease receivable |  |  |  | $ 70,000

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- Definition Mileage Credits, related to lease expense + References No definition available. + Details
Name: | gel_MileageCredits
Namespace Prefix: | gel_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Sales-type Direct Financing Lease, Account Receivable + References No definition available. + Details
Name: | gel_SalesTypeDirectFinancingLeaseAccountReceivable
Namespace Prefix: | gel_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Write Off Of Amortization Of Leased Assets, Sublease Income And Other Adjustments + References No definition available. + Details
Name: | gel_WriteOffOfAmortizationOfLeasedAssetsSubleaseIncomeAndOtherAdjustments
Namespace Prefix: | gel_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_LeasesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 53 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479589/842-20-55-53 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147478964/842-20-50-4 + Details
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