The annual rate paid for the use of letters of credit.

No definition available.

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- Definition

Line of credit facility, aggregate maximum borrowing capacity after accordion feature adjustment.

+ References

No definition available.

+ Details

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Namespace Prefix:	gel_
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Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(1))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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Balance Type:	na
Period Type:	instant

- Details

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- Definition

The amount of debt premium that was originally recognized at the issuance of the instrument that has yet to be amortized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 1A

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 55

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

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

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.16)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 20, 22

-Article 5

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.16)

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

+ Details

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Balance Type:	credit
Period Type:	instant

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19(b),22(b))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

+ Details

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

- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

+ Details

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

- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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Period Type:	duration

- Details

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- Details

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- Details

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Debt (Narrative) (Details) (USD $)	3 Months Ended
Debt (Narrative) (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
7.875% Senior Unsecured Notes [Member]
Debt Instrument [Line Items]
Senior unsecured notes, stated rate	7.875%	7.875%
Debt Instrument, Unamortized Premium	604,000	$ 639,000
Senior Secured Credit Facility [Member]
Debt Instrument [Line Items]
Credit facility, amount outstanding	648,400,000
Line Of Credit Facility Aggregate Maximum Borrowing Capacity	1,500,000,000
Total amount available for borrowings under credit facility	340,400,000
Senior Secured Credit Facility [Member] \| Letters Of Credit [Member]
Debt Instrument [Line Items]
Letters of credit, outstanding amount	11,200,000
Senior Secured Credit Facility [Member] \| Accordion Feature [Member]
Debt Instrument [Line Items]
Credit facility, maximum borrowing capacity	300,000,000
Five Point Seventy Five Percentage Senior Unsecured Notes [Member]
Debt Instrument [Line Items]
Senior unsecured notes, stated rate	5.75%	5.75%
Five Point Six Two Five Percentage Senior Unsecured Notes [Member] [Domain]
Debt Instrument [Line Items]
Senior unsecured notes, stated rate	5.625%	5.625%
Amended Facility [Member]
Debt Instrument [Line Items]
Credit facility, maximum borrowing capacity	1,000,000,000
Amended Facility [Member] \| Senior Secured Credit Facility [Member] \| Accordion Feature [Member]
Debt Instrument [Line Items]
Credit facility, maximum borrowing capacity	500,000,000
Minimum [Member]
Debt Instrument [Line Items]
Letter of Credit, Fee Percentage	1.50%
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage	0.25%
Minimum [Member] \| Eurodollar Rate [Member]
Debt Instrument [Line Items]
Letter of Credit, Fee Percentage	1.50%
Minimum [Member] \| Alternate Base Rate [Member]
Debt Instrument [Line Items]
Letter of Credit, Fee Percentage	0.50%
Maximum [Member]
Debt Instrument [Line Items]
Letter of Credit, Fee Percentage	2.50%
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage	0.375%
Maximum [Member] \| Eurodollar Rate [Member]
Debt Instrument [Line Items]
Letter of Credit, Fee Percentage	2.50%
Maximum [Member] \| Senior Secured Credit Facility [Member] \| Letters Of Credit [Member]
Debt Instrument [Line Items]
Letters of credit, outstanding amount	100,000,000
Maximum [Member] \| Alternate Base Rate [Member]
Debt Instrument [Line Items]
Letter of Credit, Fee Percentage	1.50%
Petroleum Products [Member] \| Senior Secured Credit Facility [Member]
Debt Instrument [Line Items]
Credit facility, amount outstanding	48,300,000