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Acquisition (Pro Forma Financial Information) (Details) - Petrobas America Inc - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2018
Pro Forma Financial Information |  |
Revenues | $ 855,689 | $ 2,383,296
Net Income Attributable to Murphy | $ 266,275 | $ 823,704
Net Income Attributable to PAI per Common Share [Abstract] |  |
Basic | $ 1.54 | $ 4.76
Diluted | $ 1.53 | $ 4.73

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