Supplemental Cash Flow Information (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Decrease (increase) in current assets:
Receivables from related party	$ (7,662,000)	$ 4,436,000
Prepaid expenses and other	(172,000)	(122,000)
Increase (decrease) in current liabilities:
Accounts payable	(275,000)	(2,181,000)
Accrued liabilities	556,000	360,000
Taxes other than income taxes	(224,000)	(385,000)
Deferred revenue from related party	22,000	663,000
Changes in current assets and current liabilities	(7,755,000)	2,771,000	[1]
Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract]
Projects funded by Valero Energy Corporation	4,839,000
Units issued in connection with the acquisition of the Houston and St. Charles Terminal Services Business	1,947,041
Reconciliation of Net Transfers to Valero
Net transfers from Valero per statement of partners’ capital	9,934,000	24,002,000	[2]
Less: Noncash transfers to Valero	(1,001,000)	(754,000)	[2]
Net transfers from Valero per statement of cash flows	10,935,000	24,756,000	[1],[2]
Cash Flows Related to Interest and Income Taxes Paid
Interest paid	172,000	236,000	[2]
Income taxes paid	0	31,000	[2]
Majority Shareholder [Member] | Houston and St. Charles Terminal Services Business [Member]
Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract]
Projects funded by Valero Energy Corporation	4,800,000
Projects funded by Valero, noncash investing	4,500,000
Projects funded by Valero, noncash operating	300,000
Amount issued in connection with the acquisition of the Houston and St. Charles Terminal Acquisition, noncash financing	100,000,000
General Partner Valero [Member]
Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract]
Projects funded by Valero Energy Corporation	136,000
Units issued in connection with the acquisition of the Houston and St. Charles Terminal Services Business	38,941
General Partner Valero [Member] | Majority Shareholder [Member] | Houston and St. Charles Terminal Services Business [Member]
Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract]
Units issued in connection with the acquisition of the Houston and St. Charles Terminal Services Business	38,941
Common Unitholder Valero [Member]
Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract]
Projects funded by Valero Energy Corporation	$ 1,497,000
Units issued in connection with the acquisition of the Houston and St. Charles Terminal Services Business	1,908,100
Common Unitholder Valero [Member] | Majority Shareholder [Member] | Houston and St. Charles Terminal Services Business [Member]
Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract]
Units issued in connection with the acquisition of the Houston and St. Charles Terminal Services Business	1,908,100

[1] Prior period financial information has been retrospectively adjusted for the acquisitions of the Texas Crude Systems Business and the Houston and St. Charles Terminal Services Business from Valero Energy Corporation. See Notes 1 and 3.

[2] Prior period financial information has been retrospectively adjusted for the Acquisitions.