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Partners' Capital (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
[1]
Sep. 16, 2016
Partners’ capital:      
Public offering of common units (shares) 733,601    
Compensation paid on issuance of common limited partner units $ 414 $ 107  
Contributions from Valero $ 739 $ 0  
General partner units issued (shares) 15,412    
Majority Shareholder [Member]      
Partners’ capital:      
General partner ownership interest (percent) 2.00%    
Limited Partner [Member] | Common Unitholders Public [Member]      
Partners’ capital:      
Public offering of common units (shares) 733,601    
General Partner Valero [Member]      
Partners’ capital:      
General partner units issued (shares) 15,412    
Public Offering [Member]      
Partners’ capital:      
Aggregate offering price of common units     $ 350,000
Proceeds received $ 34,900    
Compensation paid on issuance of common limited partner units $ 414    
Public Offering [Member] | Limited Partner [Member] | Common Unitholders Public [Member]      
Partners’ capital:      
Public offering of common units (shares) 733,601    
General Partner Valero [Member]      
Partners’ capital:      
Contributions from Valero $ 739    
General Partner Valero [Member] | General Partner Valero [Member]      
Partners’ capital:      
General partner units issued (shares) 15,412    
[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.