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Employee Benefit Plans (Narrative) (Details)	Sep. 01, 2017
Alkali Business | Alkali Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Period of credited service required by benefit plan	1 year

X

- Definition

Defined Benefit Plan, Requisite Service Period

+ References

No definition available.

+ Details

Name:	gel_DefinedBenefitPlanRequisiteServicePeriod
Namespace Prefix:	gel_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_DefinedBenefitPlanDisclosureLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_BusinessAcquisitionAxis=gel_AlkaliBusinessMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_PlanNameAxis=gel_AlkaliPensionPlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: