Related-Party Transactions (Details) (USD $)	3 Months Ended			0 Months Ended
	Mar. 31, 2015	Mar. 31, 2014		Mar. 01, 2015	Dec. 31, 2014		Feb. 28, 2015
Receivables from Related Party
Receivables from related party	$ 16,161,000				$ 8,499,000	[1]
Significant Related Party Revenues and Expenses
Operating revenues – related party	41,886,000	29,489,000	[2],[3]
Majority Shareholder [Member]
Receivables from Related Party
Trade receivables – related party	20,339,000				10,515,000
Due to related party	(4,178,000)				(2,016,000)
Receivables from related party	16,161,000				8,499,000
Significant Related Party Revenues and Expenses
Operating expenses	6,555,000	6,029,000	[3]
General and administrative expenses	2,512,000	2,587,000	[3]
Summary of Employee Benefit Plan Costs
Pension and postretirement costs	2,000	35,000	[3]
Defined contribution plan costs	2,000	31,000	[3]
Revenues Included from Current Lease Arrangements
Contingent rental revenues	2,700,000	200,000
Future Minimum Rentals to be Received
Remainder of 2015	96,306,000
2016	127,824,000
2017	127,824,000
2018	127,824,000
2019	127,824,000
Thereafter	637,196,000
Total minimum rental payments	1,244,798,000
Majority Shareholder [Member] | Omnibus Agreement [Member]
Related Party Transactions (Textual)
Annual administrative fee				10,400,000			9,200,000
Majority Shareholder [Member] | Houston and St. Charles Terminal Services Business [Member]
Related Party Transactions (Textual)
Effective dates of the Acquisitions	Mar. 01, 2015
Majority Shareholder [Member] | Houston and St. Charles Terminal Services Business [Member] | Commercial Agreements [Member]
Related Party Transactions (Textual)
Agreement maturity date	Mar. 01, 2025
Majority Shareholder [Member] | Houston and St. Charles Terminal Services Business [Member] | Lease and Access Agreements [Member]
Related Party Transactions (Textual)
Agreement maturity date	Mar. 01, 2025
Number of renewal options				4
Duration of renewal option, lessor lease and access agreements				5 years
Number of lease and access agreements with Valero				2
Majority Shareholder [Member] | Houston Terminal Agreement [Member] | Commercial Agreements [Member]
Related Party Transactions (Textual)
Number of renewal options				1
Duration of renewal option, commercial agreements				5 years
Majority Shareholder [Member] | Houston Terminal Agreement [Member] | Lease and Access Agreements [Member]
Related Party Transactions (Textual)
Base rent for the lease and access agreements	1,700,000
Majority Shareholder [Member] | St. Charles Terminal Agreement [Member] | Commercial Agreements [Member]
Related Party Transactions (Textual)
Number of renewal options				1
Agreement maturity date, renewal period	Jan. 31, 2030
Majority Shareholder [Member] | St. Charles Terminal Agreement [Member] | Lease and Access Agreements [Member]
Related Party Transactions (Textual)
Agreement maturity date, renewal period	Dec. 31, 2044
Base rent for the lease and access agreements	$ 4,700,000
Majority Shareholder [Member] | Texas Crude Systems Business [Member]
Related Party Transactions (Textual)
Effective dates of the Acquisitions	Jul. 01, 2014

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

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