Acquisitions (Narrative) (Details) (USD $)	0 Months Ended	1 Months Ended		12 Months Ended			1 Months Ended	12 Months Ended	1 Months Ended	12 Months Ended		1 Months Ended		12 Months Ended	3 Months Ended	12 Months Ended		12 Months Ended													12 Months Ended
	Dec. 28, 2010	Jul. 31, 2011	Nov. 30, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Nov. 23, 2010 Cameron Highway Oil Pipeline Company [Member]	Dec. 31, 2010 Cameron Highway Oil Pipeline Company [Member] Mi	Aug. 31, 2011 FMT Black Oil Barge Transportation Business [Member]	Dec. 31, 2011 FMT Black Oil Barge Transportation Business [Member]	Aug. 31, 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]	Dec. 31, 2011 FMT Lease [Member] FMT Black Oil Barge Transportation Business [Member]	Sep. 30, 2010 DG Marine [Member]	Dec. 31, 2010 DG Marine [Member]	Jul. 31, 2010 DG Marine [Member]	Dec. 31, 2011 Poseidon Oil Pipeline Company, L.L.C. [Member] Mi	Dec. 31, 2011 Odyssey Pipeline L.L.C. [Member] Mi	Dec. 31, 2011 Eugene Island Pipeline System [Member] Mi In	Dec. 31, 2010 Minimum [Member] Cameron Highway Oil Pipeline Company [Member] In	Nov. 30, 2011 Minimum [Member] Garco Refinery [Member] In	Dec. 31, 2011 Minimum [Member] Poseidon Oil Pipeline Company, L.L.C. [Member] In	Dec. 31, 2011 Minimum [Member] Odyssey Pipeline L.L.C. [Member] In	Dec. 31, 2010 Maximum [Member] Cameron Highway Oil Pipeline Company [Member] In	Nov. 30, 2011 Maximum [Member] Garco Refinery [Member] In	Dec. 31, 2011 Maximum [Member] Poseidon Oil Pipeline Company, L.L.C. [Member] In	Dec. 31, 2011 Maximum [Member] Odyssey Pipeline L.L.C. [Member] In	Jul. 31, 2010 TD Marine LLC [Member] DG Marine [Member]	Dec. 31, 2010 Enterprise Products Partners, L.P. [Member] Cameron Highway Oil Pipeline Company [Member]	Dec. 31, 2011 Barges [Member] DG Marine [Member] FMT Black Oil Barge Transportation Business [Member]	Dec. 31, 2011 Push/Tow Boats [Member] DG Marine [Member] FMT Black Oil Barge Transportation Business [Member]
Business Acquisition [Line Items]
Percentage of equity interest acquired							50.00%										51.00%
Effective date of acquisition									August 2011			November 2011						July 2010
Purchase price of acquired entity							$ 330,000,000			$ 143,500,000	$ 2,500,000	$ 20,000,000	$ 1,300,000
Purchase price adjustments							2,500,000
Issuance of units for cash, shares								5,175,000
Number of barges acquired										30				7
Number of push boats acquired										14
Expanded fleet of barges										50																					20	8
Price per share of common units issued		$ 26.30	$ 23.58				$ 23.58
Proceeds from issuance of senior unsecured notes					250,000,000			250,000,000
General Partners' interest percentage	2.00%						2.00%
Proceeds from issuance of common units and general partner contribution net of issuance costs								119,000,000
Pipeline capacity, barrels per day					500,000							3,500						400,000	300,000	200,000
Barge capacity capable of transporting crude oil										750,000
Percentage of interest in joint venture																														50.00%
Ownership percentage												90.00%					49.00%	28.00%	29.00%	23.00%
Pipeline length, in miles								380				300						367	120	183
Pipeline diameter, in inches																				20	24	3	16	12	30	6	24	20
Transaction costs related to business acquisition																	800,000
Pay off of outstanding principal balance																44,400,000
Reclassification of the noncontrolling interest to partners capital account in business acquisition																21,300,000
Interest expense				35,767,000	22,924,000	13,660,000									1,300,000
Reduction in partners' capital due to acquisitions					26,288,000
Contributions from partners' capital			2,490,000		2,541,000	9,000
Decrease in capital due to acquisition																(5,000,000)
Cash paid for acquisition								330,000,000																					25,500,000
Proceeds received from offering, net of costs		$ 184,969,000	$ 118,837,000