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Acquisition (Narrative) (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2012 | Jan. 03, 2012
Business Acquisition [Line Items] |  |
Purchase price, net of post-closing adjustments of acquired entity | 205.6 |
Number of small offshore pipelines acquired |  | 2
Gulf Of Mexico Crude Oil Pipeline Systems [Member] |  |
Business Acquisition [Line Items] |  |
Effective date of acquisition | January 1, 2012 |
Purchase price, net of post-closing adjustments of acquired entity |  | $ 205.6
Genesis Energy Interest In Poseidon Oil Pipeline Company LLC [Member] |  |
Business Acquisition [Line Items] |  |
Percentage of equity interest acquired |  | 28.00%
Genesis Energy Interest In Odyssey LLC [Member] |  |
Business Acquisition [Line Items] |  |
Percentage of equity interest acquired |  | 29.00%
Genesis Energy Interest In Marathon Offshore Pipeline LLC, Subsequently Named GOPL [Member] |  |
Business Acquisition [Line Items] |  |
Percentage of equity interest acquired |  | 100.00%
GOPL Interest In Eugene Island Crude Oil Pipeline System [Member] |  |
Business Acquisition [Line Items] |  |
Percentage of equity interest acquired |  | 23.00%
GOPL Interest In Two Small Offshore Pipelines [Member] | Other Offshore Pipelines [Member] |  |
Business Acquisition [Line Items] |  |
Percentage of equity interest acquired |  | 100.00%
Poseidon Oil Pipeline Company, L.L.C. [Member] |  |
Business Acquisition [Line Items] |  |
Pipeline capacity, barrels per day | 400,000 |
Pipeline length, in miles | 367 |
Odyssey Pipeline L.L.C. [Member] |  |
Business Acquisition [Line Items] |  |
Pipeline capacity, barrels per day | 300,000 |
Pipeline length, in miles | 120 |
GOPL [Member] |  |
Business Acquisition [Line Items] |  |
Pipeline capacity, barrels per day | 200,000 |
Pipeline length, in miles | 183 |
Pipeline diameter, in inches | 20 |
Minimum [Member] | Poseidon Oil Pipeline Company, L.L.C. [Member] |  |
Business Acquisition [Line Items] |  |
Pipeline diameter, in inches | 16 |
Minimum [Member] | Odyssey Pipeline L.L.C. [Member] |  |
Business Acquisition [Line Items] |  |
Pipeline diameter, in inches | 12 |
Maximum [Member] | Poseidon Oil Pipeline Company, L.L.C. [Member] |  |
Business Acquisition [Line Items] |  |
Pipeline diameter, in inches | 24 |
Maximum [Member] | Odyssey Pipeline L.L.C. [Member] |  |
Business Acquisition [Line Items] |  |
Pipeline diameter, in inches | 20 |

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- Definition The total cost of the acquired entity including the cash paid to shareholders of acquired entities, fair value of debt and equity securities issued to shareholders of acquired entities, the fair value of the liabilities assumed, and direct costs of the acquisition. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 51 -Subparagraph d -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Month, date and year in which the acquirer obtains control of the acquiree. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6909708&loc=d3e848-128460 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6909870&loc=d3e1392-128463 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141R -Paragraph 3 -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6909708&loc=d3e845-128460 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141R -Paragraph 10, 11 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141R -Paragraph 68 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Acquisition Date -URI http://asc.fasb.org/extlink&oid=6919109 + Details
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