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Description of Business and Basis of Presentation (Details)
 1 Months Ended
Aug. 30, 2013
Mar. 31, 2013
USD ($)
$ / shares
shares
Sep. 30, 2018
state
station
$ / shares
Dec. 31, 2017
$ / shares
Product Information [Line Items]        
Number of states in which entity operates | state     26  
Number of stations     1,461  
Common stock shares issued (in shares) | shares   100    
Common stock par value (in dollars per share) | $ / shares   $ 0.01 $ 0.01 $ 0.01
Proceeds from issuance of common stock | $   $ 1.00    
Percentage of shares of stock distributed 100.00%      
Murphy USA        
Product Information [Line Items]        
Number of stations     1,160  
Murphy Express        
Product Information [Line Items]        
Number of stations     301