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v3.20.4

Debt (Redemption Periods Senior Unsecured Notes) (Details) - Senior Unsecured Notes | 12 Months Ended
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Dec. 31, 2020
Debt Instrument [Line Items] |
Redemption of up to 35% of the principal amount of notes with the proceeds of an equity offering permitted prior to | 35.00%
2023 Notes |
Debt Instrument [Line Items] |
Redemption of up to 35% of the principal amount of notes with the proceeds of an equity offering permitted prior to | 35.00%
2024 Notes |
Debt Instrument [Line Items] |
Redemption of up to 35% of the principal amount of notes with the proceeds of an equity offering permitted prior to | 35.00%
2025 Notes |
Debt Instrument [Line Items] |
Redemption of up to 35% of the principal amount of notes with the proceeds of an equity offering permitted prior to | 35.00%
2026 Notes |
Debt Instrument [Line Items] |
Redemption of up to 35% of the principal amount of notes with the proceeds of an equity offering permitted prior to | 35.00%
2027 Notes |
Debt Instrument [Line Items] |
Redemption of up to 35% of the principal amount of notes with the proceeds of an equity offering permitted prior to | 35.00%
2028 Notes |
Debt Instrument [Line Items] |
Redemption of up to 35% of the principal amount of notes with the proceeds of an equity offering permitted prior to | 35.00%

X
- Definition Maximum percentage of the unsecured notes that can be redeem early prior to the specified date. + References No definition available. + Details
Name: | gel_MaximumPercentageOfPrincipalEarlyDebtRedemption
Namespace Prefix: | gel_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- 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_DebtInstrumentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_SeniorNotesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_DebtInstrumentAxis=gel_SixPercentageSeniorUnsecuredNotesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_DebtInstrumentAxis=gel_FivePointSixTwoFivePercentageSeniorUnsecuredNotesMemberDomain
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_DebtInstrumentAxis=gel_SixPointfivepercentageSeniorUnsecuredNotesDue2025Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_DebtInstrumentAxis=gel_SixpointtwofivepercentageseniorunsecurednotesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=gel_EightPercentageSeniorUnsecuredNotesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_DebtInstrumentAxis=gel_SevenpointsevenfivepercentageseniorunsecurednotesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |