Summary of Significant Accounting Policies (Policies)	3 Months Ended
Summary of Significant Accounting Policies (Policies)	Mar. 31, 2015
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation Our consolidated financial statements include the accounts of the Partnership as well as our Predecessor (defined below). All intercompany accounts and transactions have been eliminated. The Acquisitions were accounted for as transfers of businesses between entities under common control. As entities under the common control of Valero, we recorded the Acquisitions on our balance sheet at Valero’s carrying value rather than fair value. Transfers between entities under common control are accounted for as though the transfer occurred as of the beginning of the period of transfer, and prior period financial statements and financial information are retrospectively adjusted to furnish comparative information. Accordingly, the Partnership’s financial statements and related notes have been retrospectively adjusted to include the historical results of the Acquisitions for all periods presented prior to the effective dates of each acquisition.We refer to the historical results of the Acquisitions prior to their respective acquisition dates as those of our “Predecessor.” The combined financial statements of our Predecessor were derived from the consolidated financial statements and accounting records of Valero and reflect the combined historical financial position, results of operations, and cash flows of our Predecessor as if the Acquisitions had been combined for periods prior to the effective date of each acquisition. There were no transactions between the operations of our Predecessor; therefore, there were no intercompany transactions or accounts to be eliminated in connection with the combination of those operations. In addition, our Predecessor’s statements of income include direct charges for the management and operation of our logistics assets and certain expenses allocated by Valero for general corporate services, such as treasury, accounting, and legal services. These expenses were charged, or allocated, to our Predecessor based on the nature of the expenses. Prior to the Acquisitions, our Predecessor transferred cash to Valero daily and Valero funded our Predecessor’s operating and investing activities as needed. Accordingly, cash held by Valero at the corporate level was not allocated to our Predecessor; therefore, transfers of cash to and from Valero’s cash management system are reflected as a component of net investment. These net transfers of cash were reflected as a financing activity in our statements of cash flows. In addition, interest income was not included on the net cash transfers to Valero. The financial information presented for the periods after the effective dates of the Acquisitions represents the consolidated financial position, results of operations, and cash flows of the Partnership. These unaudited financial statements have been prepared in accordance with U.S. generally accepted accounting principles (GAAP) for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X of the Securities Exchange Act of 1934. Accordingly, they do not include all of the information and notes required by U.S. GAAP for complete financial statements. In the opinion of management, all adjustments considered necessary for a fair presentation have been included. All such adjustments are of a normal recurring nature unless disclosed otherwise. Financial information for the three months ended March 31, 2015 and 2014 included in these Condensed Notes to Consolidated Financial Statements is derived from our unaudited financial statements. Operating results for the three months ended March 31, 2015 are not necessarily indicative of the results that may be expected for the year ending December 31, 2015. For further information, refer to our financial statements and notes thereto included in our annual report on Form 10-K for the year ended December 31, 2014.
Reclassifications	Reclassifications Certain amounts previously reported for the three months ended March 31, 2014 have been reclassified to conform to the 2015 presentation.
Use of Estimates	Use of Estimates The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Actual results could differ from these estimates. On an ongoing basis, we review our estimates based on currently available information. Changes in facts and circumstances may result in revised estimates.
New Accounting Pronouncements	New Accounting Pronouncements In May 2014, the Financial Accounting Standards Board (FASB) amended the Accounting Standards Codification (ASC) and issued a new accounting standard, Topic 606, “Revenue from Contracts with Customers,” to clarify the principles for recognizing revenue. The core principle of the new standard is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods and services. The standard also requires improved interim and annual disclosures that enable the users of financial statements to better understand the nature, amount, timing, and uncertainty of revenues and cash flows arising from contracts with customers. The new standard is effective for annual reporting periods beginning after December 15, 2016, including interim reporting periods within that reporting period, and can be adopted either retrospectively to each prior reporting period presented using a practical expedient, as allowed by the new standard, or retrospectively with a cumulative effect adjustment to partners’ capital as of the date of initial application. Early adoption is not permitted. We are currently evaluating the effect that adopting this new standard will have on our consolidated financial statements and related disclosures. In February 2015, the provisions of ASC Topic 810, “Consolidation” were amended to improve consolidation guidance for certain types of legal entities. The guidance modifies the evaluation of whether limited partnerships and similar legal entities are variable interest entities (VIEs) or voting interest entities, eliminates the presumption that a general partner should consolidate a limited partnership, affects the consolidation analysis of reporting entities that are involved with VIEs, particularly those that have fee arrangements and related party relationships, and provides a scope exception from consolidation guidance for certain money market funds. These provisions are effective for annual reporting periods beginning after December 15, 2015, and interim periods within those annual periods, with early adoption permitted. These provisions may also be adopted retrospectively in previously issued financial statements for one or more years with a cumulative-effect adjustment to partners’ capital as of the beginning of the first year restated. The adoption of this guidance effective January 1, 2016 will not affect our financial position or results of operations. In April 2015, the provisions of ASC Subtopic 835-30, “Interest–Imputation of Interest” were amended to simplify the presentation of debt issuance costs. The guidance requires that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability, consistent with debt discounts, and that amortization of debt issuance costs be reported as interest expense. These provisions are to be applied retrospectively and are effective for annual reporting periods beginning after December 15, 2015, and interim periods within those annual periods, with early adoption permitted. The adoption of this guidance effective January 1, 2016 will not materially affect our financial position or results of operations; however, our debt issuance costs will be reported in the balance sheet as a direct deduction from long-term debt and excluded from “deferred charges and other assets, net.” Also in April 2015, the provisions of ASC Topic 260, “Earnings Per Share” were amended to provide guidance on how master limited partnerships apply the two-class method of calculating earnings per unit for historical periods when they receive net assets in a dropdown transaction that is accounted for as a transaction between entities under common control as required under Subtopic 805-50, “Business Combinations–Related Issues.” The amendments specify that for purposes of calculating earnings per unit under the two-class method for periods before the date of a dropdown transaction, earnings or losses of a transferred business should be allocated entirely to the general partner. Qualitative disclosures are also required to describe how the rights to earnings or losses differ before and after the dropdown transaction for purposes of computing earnings per unit under the two-class method. These provisions are effective for annual reporting periods beginning after December 15, 2015, and interim periods within those annual periods, with early adoption permitted, and should be applied retrospectively for all financial statements presented. The adoption of this guidance effective January 1, 2016 will not affect our financial position or results of operations, but will result in additional disclosures.