Organization and Basis of Presentation, Narrative (Details)	6 Months Ended
	Jun. 30, 2013	Jun. 01, 2013 terminals
Carson Terminal Assets
Acquisition
Effective date of acquisition	Jun. 01, 2013
Number of assets (assets)		6
Northwest Products System
Acquisition
Effective date of acquisition	Jun. 19, 2013
Martinez Marine Terminal Acquisition
Acquisition
Effective date of acquisition	Apr. 01, 2012
Long Beach Assets Acquisition
Acquisition
Effective date of acquisition	Sep. 14, 2012
Anacortes Rail Facility
Acquisition
Effective date of acquisition	Nov. 15, 2012