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Employee and Retiree Benefit Plans	12 Months Ended
Employee and Retiree Benefit Plans	Dec. 31, 2015
Compensation and Retirement Disclosure [Abstract]
Employee and Retiree Benefit Plans	Employee and Retiree Benefit Plans PENSION AND POSTRETIREMENT PLANS — After separating from Murphy Oil, the Company no longer sponsors or participates in any defined benefit pension plan or post retirement benefit plan for its employees. Prior to the separation, Murphy Oil had defined benefit pension plans that were principally noncontributory and covered most full-time employees. Upon separation from Murphy Oil, all amounts for these plans that involved Murphy USA employees were frozen and retained by Murphy Oil. U.S. Health Care Reform — In March 2010, the United States Congress enacted a health care reform law. Along with other provisions, the law (a) imposes a 40% excise tax on high-cost health plans as defined in the law beginning in 2018; (b) eliminated lifetime or annual coverage limits and required coverage for preventative health services beginning in September 2010; and (c) imposed a fee of $2 (subsequently adjusted for inflation) for each person covered by a health insurance policy beginning in September 2010. The new law did not significantly affect the Company’s consolidated and combined financial statements as of December 31, 2015 and 2014 and for the three years ended December 31, 2015. The Company continues to evaluate the various components of the law as guidance is issued and cannot predict with certainty all the ways it may impact the Company. However, based on the evaluation performed to date, the Company currently believes that the health care reform law will not have a material effect on its financial condition, results of operations, or cash flows in future periods. THRIFT PLAN – At the time of the spin-off, Murphy USA set up a new qualified defined contribution plan for full-time employees with an asset transfer from the Murphy Oil defined contribution plan. Most full-time employees of the Company may participate in savings plans by contributing up to a specified percentage of their base pay. The Company matches contributions at 100% of each employee’s contribution with a maximum match of 6%. In addition, the Company makes profit sharing contributions on an annual basis. Eligible employees receive a stated percentage of their base and incentive pay of 5%, 7%, or 9% determined on a formula that is based on a combination of age and years of service. The Company’s expenses related to this plan were $9,216,000 in 2015, $8,879,000 in 2014 and $4,567,000 in 2013. PROFIT SHARING PLAN – Eligible part-time employees may participate in the Company’s noncontributory profit sharing plan. Each year, the Company may make a discretionary employer contribution in an amount determined and authorized at the discretion of the Board of Directors. Eligible employees receive an allocation based on their compensation earned for the year the contribution is allocated. The Company’s expenses related to this plan were $1,848,000 in 2015, $1,848,000 in 2014 and $1,861,000 in 2013.