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Lease Accounting (Narrative) (Details) $ in Millions	6 Months Ended
	Jun. 30, 2020 USD ($)
Leases [Abstract]
Fixed quarterly payments to be received under finance lease arrangement	$ 5.2
Interest rate under finance lessor arrangement	10.25%
Fair value of direct finance lease, current	$ 9.8

X

- Definition

Lessor, Direct Financing Lease, Interest Rate

+ References

No definition available.

+ Details

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Namespace Prefix:	gel_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Sales-type and Direct Financing Leases, Lease Receivable, Quarterle Payments to be Received

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

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

X

- Definition

Present value of lease payments not yet received by lessor and amount expected to be derived from underlying asset, following end of lease term guaranteed by lessee or other third party unrelated to lessor, from sales-type and direct financing leases.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 30
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=121576215&loc=SL77919391-209981

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 30
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=121576215&loc=SL77919379-209981

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant