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Description of Business and Basis of Presentation (Details) |  | 1 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Aug. 30, 2013 | Mar. 31, 2013 USD ($) shares | Jun. 30, 2020 station store state $ / shares | Jan. 01, 2020 USD ($) | Dec. 31, 2019 $ / shares | Jun. 30, 2013 $ / shares
Product Information [Line Items] |  |  |  |  |  |
Number Of Stores Sold | store |  |  | 9 |  |  |
Number of states in which entity operates | state |  |  | 25 |  |  |
Number of stations |  |  | 1,485 |  |  |
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% |  |  |  |  |
Accounting Standards Update 2016-13 |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |
Allowance for credit loss | $ |  |  |  | $ 1,100,000 |  |
Murphy USA |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |
Number of stations |  |  | 1,152 |  |  |
Murphy Express |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |
Number of stations |  |  | 333 |  |  |

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