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Organization (Details)
bbl in Millions
3 Months Ended
Mar. 31, 2017
USD ($)
operating_segments
mi
shares
bbl
Sep. 30, 2016
USD ($)
mi
Mar. 31, 2016
USD ($)
Dec. 31, 2016
shares
Business Acquisition [Line Items]        
Pipeline, Miles | mi 705      
Active Storage Capacity | bbl 12.4      
Number of Reportable Segments | operating_segments 2      
Western Refining, Inc. [Member]        
Business Acquisition [Line Items]        
Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Interest 100.00%      
Limited Liability Company (LLC) or Limited Partnership (LP), Members or Limited Partners, Ownership Interest 52.50%      
Investor [Member]        
Business Acquisition [Line Items]        
Limited Liability Company (LLC) or Limited Partnership (LP), Members or Limited Partners, Ownership Interest 47.50%      
St. Paul Park Logistics Assets [Member]        
Business Acquisition [Line Items]        
Pipeline, Miles | mi   2.5    
Payments to Acquire Businesses, Gross   $ 195,000,000    
Subordinated Units [Member] | Western Refining, Inc. [Member]        
Business Acquisition [Line Items]        
Limited Partners' Capital Account, Units Outstanding | shares 0     22,811,000
Common Units [Member] | Western Refining, Inc. [Member]        
Business Acquisition [Line Items]        
Limited Partners' Capital Account, Units Outstanding | shares 32,018,847     9,207,847
Common Units [Member] | Investor [Member]        
Business Acquisition [Line Items]        
Limited Partners' Capital Account, Units Outstanding | shares 28,923,130      
Common Units [Member] | St. Paul Park Logistics Assets [Member]        
Business Acquisition [Line Items]        
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable   628,224    
Common Units [Member] | St. Paul Park Logistics Assets [Member]        
Business Acquisition [Line Items]        
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable   $ 628,224    
Fee Based Revenues [Member]        
Business Acquisition [Line Items]        
Revenues: Third-party $ 619,000   $ 690,000  
Fee Based Revenues [Member] | St. Paul Park Logistics Assets [Member]        
Business Acquisition [Line Items]        
Revenues: Third-party     $ 0