Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands					12 Months Ended
	Sep. 01, 2016	Apr. 01, 2016	Oct. 01, 2015	Mar. 01, 2015	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Decrease (increase) in current assets:
Receivables – related party					$ (9,607)	$ (10,786)	$ (15,588)
Receivables					(781)	0	0
Prepaid expenses and other					277	(365)	95
Increase (decrease) in current liabilities:
Accounts payable					7,411	586	(631)
Accounts payable – related party					(3,404)	(667)	5,999
Accrued liabilities					137	34	(87)
Accrued liabilities – related party					10	40	21
Accrued interest payable					1,278	1,054	226
Accrued interest payable – related party					864	(429)	476
Taxes other than income taxes payable					2,684	1,181	511
Deferred revenue – related party					(2,599)	3,396	5
Changes in current assets and current liabilities					(3,730)	(5,956)	(8,973)
Cash Flows Related to Interest and Income Taxes
Interest paid					33,355	13,873	5,367
Income taxes paid					719	505	441
Investing and Financing Cash Outflows in Connection with Acquisitions
Financing cash outflow					54,618	376,393	576,076
Other Noncash Activities
Increase in accounts payable related to capital expenditures					570	904	5,496
Offering costs included in accounts payable					0	0	(102)
Units issued under ATM Program included in receivables					0	1,682	0
Majority Shareholder [Member]
Investing and Financing Cash Outflows in Connection with Acquisitions
Investing cash outflow					407,844	103,607	390,144
Financing cash outflow					54,618	376,393	576,076
Investing and financing cash outflow, total					462,462	480,000	966,220
Transfer (from) to Valero for:
Deferred income taxes					0	(144)
Change in accrued capital expenditures							6,950
Other Noncash Activities
Units issued to Valero Energy Corporation in connection with acquisitions					46,000	85,000	170,000
Majority Shareholder [Member] | Limited Partner [Member] | Common Unitholder Valero [Member]
Other Noncash Activities
Noncash conversion of subordinated units issued						406,400
Majority Shareholder [Member] | Limited Partner [Member] | Subordinated Unitholder Valero [Member]
Other Noncash Activities
Noncash conversion of subordinated units converted						(406,400)
Majority Shareholder [Member] | McKee Terminal Services Business [Member]
Investing and Financing Cash Outflows in Connection with Acquisitions
Investing cash outflow						51,361
Financing cash outflow						152,639
Investing and financing cash outflow, total		$ 204,000				204,000
Majority Shareholder [Member] | Meraux and Three Rivers Terminal Services Business [Member]
Investing and Financing Cash Outflows in Connection with Acquisitions
Investing cash outflow						52,246
Financing cash outflow						223,754
Investing and financing cash outflow, total	$ 276,000					276,000
Majority Shareholder [Member] | Houston and St. Charles Terminal Services Business [Member]
Investing and Financing Cash Outflows in Connection with Acquisitions
Investing cash outflow							296,109
Financing cash outflow							275,111
Investing and financing cash outflow, total				$ 571,200			571,220
Majority Shareholder [Member] | Corpus Christi Terminal Services Business [Member]
Investing and Financing Cash Outflows in Connection with Acquisitions
Investing cash outflow							94,035
Financing cash outflow							300,965
Investing and financing cash outflow, total			$ 395,000				395,000
Parkway Pipeline [Member] | Majority Shareholder [Member]
Investing and Financing Cash Outflows in Connection with Acquisitions
Investing cash outflow					200,249
Financing cash outflow					0
Investing and financing cash outflow, total					200,249
Noncash contributions from Valero:
Excess of carrying value over purchase price paid for acquisition of Parkway Pipeline					51,702	0	0
Port Arthur Terminal [Member] | Majority Shareholder [Member]
Investing and Financing Cash Outflows in Connection with Acquisitions
Investing cash outflow					207,595
Financing cash outflow					54,618
Investing and financing cash outflow, total					262,213
Capital Projects [Member] | Majority Shareholder [Member]
Noncash contributions from Valero:
Capital projects					41,305	35,732	27,748
Deferred Income Taxes [Member] | Majority Shareholder [Member]
Transfer (from) to Valero for:
Deferred income taxes					0	(190)	(282)
Construction-in-progress [Member] | Majority Shareholder [Member]
Transfer (from) to Valero for:
Change in accrued capital expenditures					$ 0	$ 46	$ 7,232