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v3.20.2

Lease Accounting (Narrative) (Details) $ in Millions | 6 Months Ended
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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

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- 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

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- Definition Sales-type and Direct Financing Leases, Lease Receivable, Quarterle Payments to be Received + References No definition available. + Details
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Namespace Prefix: | gel_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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