Fixed Assets, Mineral Leaseholds, and Asset Retirement Obligations (Forecast of Accretion Expense) (Details) $ in Thousands	Mar. 31, 2022 USD ($)
Fixed Assets And Asset Retirement Obligations [Abstract]
Remainder of 2022	$ 9,486
2023	10,583
2024	9,767
2025	10,469
2026	$ 8,216

Asset Retirement Obligation, Future Payments Due In Four Years

No definition available.

Name:	gel_AssetRetirementObligationFuturePaymentsDueInFourYears
Namespace Prefix:	gel_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Asset Retirement Obligation, Future Payments Due In One Year

No definition available.

Name:	gel_AssetRetirementObligationFuturePaymentsDueInOneYear
Namespace Prefix:	gel_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Asset Retirement Obligation, Future Payments Due In Three Years

No definition available.

Name:	gel_AssetRetirementObligationFuturePaymentsDueInThreeYears
Namespace Prefix:	gel_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Asset Retirement Obligation, Future Payments Due In Two Years

No definition available.

Name:	gel_AssetRetirementObligationFuturePaymentsDueInTwoYears
Namespace Prefix:	gel_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Asset Retirement Obligation, Future Payments Due, Remainder Of Fiscal Year

No definition available.

Name:	gel_AssetRetirementObligationFuturePaymentsDueRemainderOfFiscalYear
Namespace Prefix:	gel_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Fixed Assets And Asset Retirement Obligations [Abstract]

No definition available.

Name:	gel_FixedAssetsAndAssetRetirementObligationsAbstract
Namespace Prefix:	gel_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration