Net Income Per Limited Partner Unit (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Allocation of net income to determine net income available to limited partners:
Distributions, excluding general partner's IDRs	$ 29,731	$ 22,965
General partner’s IDRs	8,307	2,638
DERs	5	5
Distributions and DERs declared	38,043	25,608
Undistributed earnings	20,094	17,690
Net income available to limited partners – basic and diluted	$ 58,137	$ 43,298
Net income per limited partner unit – basic and diluted:
Weighted-average units outstanding (shares)	67,664	36,520	[1]
Net income per limited partner unit – basic and diluted (in dollars per share)	$ 0.72	$ 0.61	[1]
General Partner Valero [Member]
Allocation of net income to determine net income available to limited partners:
Distributions, excluding general partner's IDRs	$ 595	$ 512
General partner’s IDRs	8,307	2,638
Distributions and DERs declared	8,902	3,150
Undistributed earnings	565	354
Net income available to limited partners – basic and diluted	9,467	3,504
Limited Partner [Member] | Common Units [Member]
Allocation of net income to determine net income available to limited partners:
Distributions, excluding general partner's IDRs	29,136	12,665
Distributions and DERs declared	29,136	12,665
Undistributed earnings	19,525	9,692
Net income available to limited partners – basic and diluted	$ 48,661	$ 22,357
Net income per limited partner unit – basic and diluted:
Weighted-average units outstanding (shares)	67,664	36,520
Net income per limited partner unit – basic and diluted (in dollars per share)	$ 0.72	$ 0.61
Limited Partner [Member] | Subordinated Units [Member]
Allocation of net income to determine net income available to limited partners:
Distributions, excluding general partner's IDRs		$ 9,788
Distributions and DERs declared		9,788
Undistributed earnings		7,640
Net income available to limited partners – basic and diluted		$ 17,428
Net income per limited partner unit – basic and diluted:
Weighted-average units outstanding (shares)		28,790
Net income per limited partner unit – basic and diluted (in dollars per share)		$ 0.61
Limited Partner [Member] | Restricted Units [Member]
Allocation of net income to determine net income available to limited partners:
DERs	$ 5	$ 5
Distributions and DERs declared	5	5
Undistributed earnings	4	4
Net income available to limited partners – basic and diluted	$ 9	$ 9

[1] Financial information has been retrospectively adjusted for the acquisitions of the McKee Terminal Services Business and the Meraux and Three Rivers Terminal Services Business from Valero Energy Corporation. See Notes 1 and 2.