| Component: (Network and Table) | |
|---|---|
| Network | 2410402 - Disclosure - Asset Retirement Obligations (ARO) (Details) (http://www.murphyusa.com/role/AssetRetirementObligationsAroDetails)  | 
| Table | (Implied) | 
| Reporting Entity [Axis] | 0001573516 (http://www.sec.gov/CIK) | 
| Asset Retirement Obligation Disclosure [Abstract] | Period [Axis] | ||
|---|---|---|---|
2016-01-01 - 2016-12-31  | 2015-01-01 - 2015-12-31  | 2014-01-01 - 2014-12-31  | |
Asset Retirement Obligation Disclosure [Abstract]  | |||
Asset Retirement Obligation Roll Forward  | |||
Balance at beginning of period  | |||
Accretion expense  | 1,650,000    | 1,521,000    | 1,200,000    | 
Settlements of liabilities  | (  | ||
Liabilities incurred  | |||
Balance at end of period  | 24,345,000    | 22,245,000    | |