Consolidated Statements of Partners' Capital (unaudited) - USD ($) $ in Thousands	Total	Limited Partner [Member] Common Unitholders Public [Member]	Limited Partner [Member] Common Unitholder Valero [Member]	General Partner Valero [Member]
Beginning balance at Dec. 31, 2016	$ 55,824	$ 548,619	$ (482,197)	$ (10,598)
Increase (Decrease) in Partners' Capital Roll Forward
Net income	116,580	31,311	64,383	20,886
Unit issuance	34,253	33,505		748
Transfers to (from) partners		(16,097)	19,816	(3,719)
Noncash capital contributions from Valero Energy Corporation	19,276		18,890	386
Cash distributions to unitholders and distribution equivalent right payments	(72,938)	(18,482)	(38,102)	(16,354)
Unit-based compensation	146	146
Ending balance at Jun. 30, 2017	153,141	579,002	(417,210)	(8,651)
Beginning balance at Dec. 31, 2017	205,797	596,047	(382,652)	(7,598)
Increase (Decrease) in Partners' Capital Roll Forward
Net income	130,098	30,992	64,474	34,632
Unit issuance	5	0		5
Transfers to (from) partners		3,730	(2,396)	(1,334)
Noncash capital contributions from Valero Energy Corporation	22,317		21,872	445
Cash distributions to unitholders and distribution equivalent right payments	(102,881)	(23,281)	(48,406)	(31,194)
Unit-based compensation	123	123
Other	(67)		(66)	(1)
Ending balance at Jun. 30, 2018	$ 255,392	$ 607,611	$ (347,174)	$ (5,045)