Unit Activity (Details)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2013	Dec. 31, 2014
Limited Partners' Capital Account [Line Items]
Beginning balance	58,760,288	58,755,080
Unit-based compensation	4,443	5,208
Units issued in connection with the acquisition of the Houston and St. Charles Terminal Services Business	1,947,041
Ending balance	60,711,772	58,760,288
Common Unitholders Public [Member]
Limited Partners' Capital Account [Line Items]
Beginning balance	17,255,208	17,250,000
Unit-based compensation	4,443	5,208
Ending balance	17,259,651	17,255,208
Common Unitholder Valero [Member]
Limited Partners' Capital Account [Line Items]
Beginning balance	11,539,989		11,539,989
Units issued in connection with the acquisition of the Houston and St. Charles Terminal Services Business	1,908,100
Ending balance	13,448,089	11,539,989	11,539,989
Subordinated Unitholder Valero [Member]
Limited Partners' Capital Account [Line Items]
Beginning balance			28,789,989	28,789,989
Ending balance	28,789,989	28,789,989	28,789,989	28,789,989
General Partner Valero [Member]
Limited Partners' Capital Account [Line Items]
Beginning balance	1,175,102		1,175,102
Units issued in connection with the acquisition of the Houston and St. Charles Terminal Services Business	38,941
Ending balance	1,214,043	1,175,102	1,175,102