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Acquisitions (Narrative) (Details) (USD $) | 0 Months Ended | 1 Months Ended | 12 Months Ended |  |  | 1 Months Ended |  | 1 Months Ended |  |  |  | 1 Months Ended |  |  |  |  |  |  |  |  |
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Sep. 16, 2013 | Mar. 28, 2012 | Jul. 31, 2011 | Dec. 31, 2013 Barges Boats | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Sep. 30, 2013 | Jul. 22, 2013 Barges Tug_Boats | Jan. 31, 2012 Gulf Of Mexico Crude Oil Pipeline Systems [Member] | Dec. 31, 2013 Gulf Of Mexico Crude Oil Pipeline Systems [Member] | Aug. 31, 2011 FMT Black Oil Barge Transportation Business [Member] | Aug. 09, 2011 FMT Black Oil Barge Transportation Business [Member] Barge push_boats | Jan. 03, 2012 FMT Lease [Member] | Aug. 09, 2011 FMT Black Oil Barge Transportation Business Fuel Inventory And Other Cost [Member] | Nov. 30, 2011 Garco Refinery [Member] mi | Nov. 30, 2011 Garco Refinery Petroleum Inventories [Member] | Aug. 09, 2011 FMT Lease [Member] FMT Black Oil Barge Transportation Business [Member] Barge | Dec. 31, 2013 Poseidon Oil Pipeline Company, L.L.C. [Member] | Jan. 03, 2012 Poseidon Oil Pipeline Company, L.L.C. [Member] | Jan. 03, 2012 Marathon Offshore Pipeline, LLC [Member] | Dec. 31, 2013 Odyssey Pipeline L.L.C. [Member] | Jan. 03, 2012 Odyssey Pipeline L.L.C. [Member] | Dec. 31, 2013 Eugene Island Pipeline System [Member] | Dec. 31, 2013 Two Offshore Smaller Pipelines [Member] Pipelines | Dec. 31, 2013 CHOPS [Member] | Nov. 30, 2011 Minimum [Member] Garco Refinery [Member] in | Nov. 30, 2011 Maximum [Member] Garco Refinery [Member] in | Dec. 31, 2013 Amended Facility [Member]
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 90.00% |  |  | 28.00% | 28.00% | 100.00% | 29.00% | 29.00% | 23.00% | 100.00% | 50.00% |  |  |
Number of piepelines |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |
Effective date of acquisition |  |  |  |  |  |  |  |  |  | Jan. 03, 2012 |  | Aug. 01, 2011 |  |  |  | Nov. 01, 2011 |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Acquisitions and Disposals, Acquisition Costs or Sale Proceeds |  |  |  |  |  |  |  |  |  |  | $ 205,576,000 |  | $ 143,500,000 | $ 30,900,000 | $ 2,500,000 | $ 20,000,000 | $ 1,300,000 |  |  |  |  |  |  |  |  |  |  |  |
Number of barges acquired |  |  |  |  |  |  |  |  | 9 |  |  |  | 30 |  |  |  |  | 7 |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Tug Boats Acquired |  |  |  |  |  |  |  |  | 9 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
NumberOfBarges |  |  |  | 54 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of push boats acquired |  |  |  |  |  |  |  |  |  |  |  |  | 14 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds received from offering, net of costs | 263,574,000 | 169,421,000 | 184,969,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pipeline capacity, barrels per day |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,500 |  |  |  |  |  |  |  |  |  |  |  |  |
Pipeline length, in miles |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 300 |  |  |  |  |  |  |  |  |  |  |  |  |
Pipeline diameter, in inches |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 | 6 |
Price per share of common units issued | $ 47.51 | $ 30.80 | $ 26.30 |  |  |  |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of senior unsecured notes, including premium |  |  |  | 350,000,000 | 101,000,000 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash paid for acquisition |  |  |  | 230,880,000 | 205,576,000 | 163,673,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  | (35,771,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Transaction costs related to business acquisition |  |  |  |  |  |  |  |  | 230,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
NumberOfBoats |  |  |  | 23 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,000,000,000
Property, Plant and Equipment, Estimated Useful Lives |  |  |  | 25 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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