Description of Business and Basis of Presentation (Details)		1 Months Ended
	Aug. 30, 2013	Mar. 31, 2013 USD ($) $ / shares shares	Mar. 31, 2020 state station $ / shares	Jan. 01, 2020 USD ($)	Dec. 31, 2019 $ / shares
Product Information [Line Items]
Number of states in which entity operates | state			26
Number of stations			1,491
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%
Accounting Standards Update 2016-13
Product Information [Line Items]
Allowance for credit loss adjustment | $				$ (1,100,000)
Murphy USA
Product Information [Line Items]
Number of stations			1,161
Murphy Express
Product Information [Line Items]
Number of stations			330