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Partners' Capital and Distributions (Narrative) (Details) (USD $) | 0 Months Ended | 1 Months Ended | 12 Months Ended |  |  |  |  |  | 12 Months Ended | 0 Months Ended |  |  |  | 0 Months Ended | 12 Months Ended |  |  | 12 Months Ended |  | 0 Months Ended |  | 1 Months Ended
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Dec. 28, 2010 | Mar. 31, 2012 | Jul. 31, 2011 | Nov. 30, 2010 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Sep. 30, 2012 | Jun. 30, 2012 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 Waiver Units Class1 [Member] | Dec. 31, 2012 Waiver Units Class 2 [Member] | Dec. 31, 2012 Waiver Units Class 3 [Member] | Dec. 31, 2012 Waiver Units Class4 [Member] | Dec. 28, 2010 Genesis Crude Oil, L.P. [Member] | Mar. 28, 2012 Class A [Member] | Dec. 31, 2012 Class A [Member] | Feb. 01, 2012 Class A [Member] | Dec. 31, 2012 Class B [Member] | Dec. 28, 2010 Waiver Units [Member] | Dec. 31, 2012 Waiver Units [Member] | Aug. 14, 2012 Waiver Units [Member] | Feb. 14, 2012 Waiver Units [Member] | Dec. 31, 2012 Class One [Member] | Dec. 31, 2012 Class Two [Member] | Dec. 31, 2012 Class Three [Member] | Dec. 31, 2012 Class Four [Member] | Nov. 30, 2010 Cameron Highway Oil Pipeline Company [Member] | Dec. 28, 2010 General Partner Interest [Member] | Dec. 28, 2010 General Partners [Member] | Dec. 28, 2010 General Partners [Member] Class A [Member] | Dec. 28, 2010 General Partners [Member] Class B [Member] | Jul. 31, 2011 FMT Black Oil Barge Transportation Business [Member] Class A [Member]
Partners Capital And Distributions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common units, outstanding |  |  |  |  | 81,202,752 | 71,965,062 |  |  |  |  |  |  |  |  |  |  |  |  | 81,162,755 |  | 39,997 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Waiver units authorized |  |  |  |  |  |  |  |  |  |  |  |  | 1,738,000 | 1,738,000 | 1,738,000 | 1,738,000 |  |  |  |  |  | 7,000,000 | 3,476,466 |  |  |  |  |  |  |  |  |  |  |  |
Conversion feature, minimum distribution coverage ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.1 | 1.1 | 1.1 | 1.1 |  |  |  |  |  |
Conversion feature threshold, quarterly distribution, minimum, per unit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.43 | 0.46 | 0.49 | 0.52 |  |  |  |  |  |
Distribution paid per common unit |  | $ 0.4500 |  |  | $ 0.4850 | $ 0.4400 | $ 0.4000 | $ 0.4725 | $ 0.4600 | $ 0.4275 | $ 0.4150 | $ 0.4075 |  |  |  |  |  |  |  |  |  |  |  | $ 0.46 | $ 0.44 |  |  |  |  |  |  |  |  |  |
Limited Partners' ownership percentage | 98.00% |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
General Partners Interest In Cash Distributions | 2.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
General Partners' interest percentage | 2.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.01% |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.00% |  |  |  |
Number of common units issued |  |  |  |  | 81,202,752 | 71,965,062 |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,750,000 |  |  |  |  |  |  |  |  |  | 5,175,000 |  | 27,000,000 | 19,960,000 | 40,000 | 7,350,000
Cash or stock available for distributions, percent usually distributed |  |  |  |  | 100.00% | 100.00% | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Days to distribute |  |  |  |  | 45 days | 45 days | 45 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Price per share of common units issued |  | $ 30.80 | $ 26.30 | $ 23.58 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 30.80 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds received from offering, net of costs |  | $ 169,421,000 | $ 184,969,000 | $ 118,837,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 169,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 185,000,000
Percentage of equity interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |
Issuance of common units for cash, net |  |  |  |  | 169,421,000 | 184,969,000 | 116,347,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contribution of capital |  |  |  | 2,500,000 |  |  | 2,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital account percentage |  |  |  | 2.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-cash contributions |  |  |  |  |  |  | $ 76,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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