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Incentive Plans (Narrative) (Details) | 12 Months Ended | 28 Months Ended |  |
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Dec. 31, 2015 USD ($) plan $ / shares company shares | Dec. 31, 2014 USD ($) shares | Dec. 31, 2013 USD ($) $ / shares shares | Dec. 31, 2015 USD ($) plan company shares | Feb. 12, 2014 shares | Aug. 30, 2013 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of share based compensation plans | plan | 2 |  |  | 2 |  |
Shares granted | 72,350 | 127,400 |  |  |  |
Unrecognized compensation cost related to stock option awards | $ | $ 12,934,000 |  |  | $ 12,934,000 |  |
Unrecognized compensation cost related to stock option awards, weighted average period for recognition (in years) | 2 years 3 months 18 days |  |  |  |  |
Related income tax benefit recognized in income | $ | $ 3,155,000 | $ 3,652,000 | $ 3,287,000 |  |  |
Total income tax benefits realized from tax deductions related to stock option exercises under share-based payment arrangements | $ | $ 3,109,000 | $ 470,000 |  |  |  |
2013 Long-Term Incentive Plan [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Maximum number of shares authorized for incentive plan |  |  |  |  | 5,500,000.0 | 10,000,000
Maximum number of shares per employee | 1,000,000 |  |  |  |  |
Maximum amount payable | $ | $ 5,000,000 |  |  |  |  |
Shares granted |  |  |  | 1,563,828 |  |
Shares available for grant | 4,074,288 |  |  | 4,074,288 |  |
2013 Stock Plan For Non-Employee Directors [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Maximum number of shares authorized for incentive plan | 500,000 |  |  | 500,000 |  |
Award vesting period (in years) | 3 years |  |  |  |  |
Shares available for grant | 436,226 |  |  | 436,226 |  |
Restricted stock units issued |  |  |  | 63,774 |  |
2013 Stock Plan For Non-Employee Directors [Member] | Restricted Stock Units [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Restricted stock units issued | 12,924 | 22,437 | 28,413 |  |  |
MUSA 2013 Plan [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Restricted stock units issued | 55,450 | 93,025 | 352,522 |  |  |
Option term (in years) | 7 years |  |  |  |  |
MUSA 2013 Plan [Member] | Restricted Stock Units [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award vesting period (in years) | 3 years |  |  |  |  |
MUSA 2013 Plan [Member] | Performance Units [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Restricted stock units issued | 40,400 | 78,500 |  |  |  |
MUSA 2013 Plan [Member] | Return On Average Capital Employed Performance Units [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award vesting period (in years) | 3 years |  |  |  |  |
Restricted stock units issued, weighted average grant date fair value (in dollars per share) | $ / shares | $ 70.57 |  |  |  |  |
MUSA 2013 Plan [Member] | Total Shareholder Return Performance Units [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award vesting period (in years) | 3 years |  |  |  |  |
Number of companies in total shareholder return peer comparison group | company | 16 |  |  | 16 |  |
Restricted stock units issued, weighted average grant date fair value (in dollars per share) | $ / shares | $ 100.33 |  |  |  |  |
Murphy Oil [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award vesting period (in years) | 2 years |  |  |  |  |
Related income tax benefit recognized in income | $ | $ 0 | $ 0 | $ 625,000 |  |  |
Minimum grant date fair value of options replaced (in dollars per share) | $ / shares |  |  | $ 32.53 |  |  |
Maximum grant date fair value of options replaced (in dollars per share) | $ / shares |  |  | $ 40.25 |  |  |

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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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