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Business Segment Information (Schedule of Revenues by Segment) (Details) $ in Thousands | 3 Months Ended | 12 Months Ended |  |  |  |
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Dec. 31, 2016 USD ($) | Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Sep. 30, 2015 USD ($) | Jun. 30, 2015 USD ($) | Mar. 31, 2015 USD ($) | Dec. 31, 2016 USD ($) segment | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Jul. 25, 2015 | Jul. 24, 2015 USD ($) | Jul. 23, 2015 | Nov. 13, 2014 USD ($)
Segment Reporting [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of operating segments | segment |  |  |  |  |  |  |  |  |  | 4 |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Segment Margin | [1] |  |  |  |  |  |  |  |  | $ 569,571 | $ 476,585 | $ 347,264 |  |  |  |
Capital Expenditures | [2] |  |  |  |  |  |  |  |  | 443,993 | 2,007,611 | 644,548 |  |  |  |
ExternalCustomerRevenues |  |  |  |  |  |  |  |  |  | 1,712,493 | 2,246,529 | 3,846,164 |  |  |  |
Intersegment | [3] |  |  |  |  |  |  |  |  | 0 | 0 | 0 |  |  |  |
Revenues |  | $ 428,053 | $ 460,050 | $ 445,976 | $ 378,414 | $ 491,011 | $ 572,334 | $ 656,327 | $ 526,857 | 1,712,493 | 2,246,529 | 3,846,164 |  |  |  |
Deepwater Gateway LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital Expenditures | [3] |  |  |  |  |  |  |  |  |  | $ 35,100 |  |  |  |  |
Equity investment, ownership percentage |  |  |  |  | 50.00% | 50.00% |  |  |  |  | 50.00% |  |  |  |  |
Transaction costs related to business acquisition |  |  |  |  | $ 26,000 |  |  |  |  |  |  |  |  |  |  |
SEKCO [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity investment, ownership percentage |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |
Enterprise Offshore Acquisition [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Transaction costs related to business acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,500,000 |  |
Enterprise Offshore Acquisition [Member] | Deepwater Gateway LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity investment, ownership percentage |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |
Enterprise Offshore Acquisition [Member] | SEKCO [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity investment, ownership percentage |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% | 50.00% |
Enterprise Offshore Acquisition [Member] | SEKCO [Member] | Co-venturer [Member] | Enterprise [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity investment, ownership percentage |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |
M/T American Phoenix Acquisition [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Transaction costs related to business acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 157,000
Offshore Pipeline Transportation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 334,679 | $ 140,230 | 3,296 |  |  |  |
Offshore Pipeline Transportation [Member] | SEKCO [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital Expenditures |  |  |  |  |  |  |  |  |  |  | 2,500 |  |  |  |  |
Offshore Pipeline Transportation [Member] | Enterprise Offshore Acquisition [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital Expenditures | [3] |  |  |  |  |  |  |  |  |  | 1,500,000 |  |  |  |  |
Refinery Services [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 171,503 | 177,880 | 207,401 |  |  |  |
Marine Transportation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 213,021 | 238,757 | 229,282 |  |  |  |
Supply And Logistics [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 993,290 | 1,689,662 | 3,406,185 |  |  |  |
Operating Segments [Member] | Offshore Pipeline Transportation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Segment Margin | [1] |  |  |  |  |  |  |  |  | 336,620 | 197,723 | 71,598 |  |  |  |
Capital Expenditures | [2] |  |  |  |  |  |  |  |  | 46,277 | 1,527,320 | 37,639 |  |  |  |
ExternalCustomerRevenues |  |  |  |  |  |  |  |  |  | 332,514 | 140,230 | 3,296 |  |  |  |
Operating Segments [Member] | Refinery Services [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Segment Margin | [1] |  |  |  |  |  |  |  |  | 79,508 | 80,246 | 84,851 |  |  |  |
Capital Expenditures | [2] |  |  |  |  |  |  |  |  | 2,274 | 1,595 | 2,385 |  |  |  |
ExternalCustomerRevenues |  |  |  |  |  |  |  |  |  | 180,665 | 187,257 | 218,297 |  |  |  |
Operating Segments [Member] | Marine Transportation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Segment Margin | [1] |  |  |  |  |  |  |  |  | 70,079 | 103,222 | 86,239 |  |  |  |
Capital Expenditures | [2] |  |  |  |  |  |  |  |  | 78,804 | 69,009 | 232,783 |  |  |  |
ExternalCustomerRevenues |  |  |  |  |  |  |  |  |  | 206,211 | 230,192 | 214,039 |  |  |  |
Operating Segments [Member] | Supply And Logistics [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Segment Margin | [1] |  |  |  |  |  |  |  |  | 83,364 | 95,394 | 104,576 |  |  |  |
Capital Expenditures | [2] |  |  |  |  |  |  |  |  | 316,638 | 409,687 | 371,741 |  |  |  |
ExternalCustomerRevenues | [1] |  |  |  |  |  |  |  |  | 993,103 | 1,688,850 | 3,410,532 |  |  |  |
Intersegment Eliminations [Member] | Offshore Pipeline Transportation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intersegment | [3] |  |  |  |  |  |  |  |  | 2,165 | 0 | 0 |  |  |  |
Intersegment Eliminations [Member] | Refinery Services [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intersegment | [3] |  |  |  |  |  |  |  |  | (9,162) | (9,377) | (10,896) |  |  |  |
Intersegment Eliminations [Member] | Marine Transportation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intersegment | [3] |  |  |  |  |  |  |  |  | 6,810 | 8,565 | 15,243 |  |  |  |
Intersegment Eliminations [Member] | Supply And Logistics [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intersegment | [3] |  |  |  |  |  |  |  |  | $ 187 | $ 812 | $ (4,347) |  |  |  |
[1] | A reconciliation of total Segment Margin to net income attributable to Genesis Energy, L.P. for each year is presented below.
[2] | Capital expenditures include maintenance and growth capital expenditures, such as fixed asset additions (including enhancements to existing facilities and construction of growth projects) as well as acquisitions of businesses and contributions to equity investees related to same. In addition to construction of growth projects, capital spending in our offshore pipeline transportation segment included $35.1 million during the year ended December 31, 2016 related to the acquisition of the remaining 50% ownership in Deepwater Gateway. In 2015, there was $1.5 billion in capital spending to fund our Enterprise acquisition. Capital spending in this segment also included $2.5 million during the year ended December 31, 2015 representing capital contributions to our SEKCO pipeline to fund our share of the construction costs for its pipeline (as prior to our Enterprise acquisition in July 2015, we owned a 50% interest in the SEKCO pipeline with Enterprise owning the remaining 50%). During 2014, capital spending in our marine transportation segment included $157.0 million for our purchase of the M/T American Phoenix.
[3] | Intersegment sales were conducted under terms that we believe were no more or less favorable than then-existing market conditions.

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- Definition Revenues less product costs, operating expenses (excluding non-cash charges such as depreciation and amortization), and segment general and administrative expenses, plus our equity in distributable cash generated by our equity investees. Also excludes the non-cash effects of our stock appreciation rights compensation plan and includes the non-income portion of payments received under direct financing leases. + References No definition available. + Details
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