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Description of Business and Basis of Presentation (Details)		1 Months Ended
	Aug. 30, 2013	Mar. 31, 2013 USD ($) $ / shares shares	Mar. 31, 2021 station states $ / shares	Dec. 31, 2020 $ / shares
Product Information [Line Items]
Number of states in which entity operates | states			25
Number of stations			1,660
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 (percent)	100.00%
Murphy USA
Product Information [Line Items]
Number of stations			1,151
Murphy Express
Product Information [Line Items]
Number of stations			353
QuickChek
Product Information [Line Items]
Number of stations			156

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