Consolidated Balance Sheets (unaudited) (Parenthetical) - shares	Jun. 30, 2018	Dec. 31, 2017
Limited Partner [Member] | Common Unitholders Public [Member]
Common unitholders, units outstanding (units)	22,493,484	22,487,586
Limited Partner [Member] | Common Unitholder Valero [Member]
Common unitholders, units outstanding (units)	46,768,586	46,768,586
General Partner Valero [Member]
General partner – Valero, units outstanding (units)	1,413,511	1,413,391