Acquisitions - Pro Forma Financial Information (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Pro Forma Financial Information
Revenues	$ 3,061,575
Net Income Attributable to Murphy	$ 1,209,380
Net Income Attributable to Murphy per Common Share
Basic (in USD per share)	$ 7.37
Diluted (in USD per share)	$ 7.34
PAI (Final)
Pro Forma Financial Information
Revenues		$ 3,290,104
Net Income Attributable to Murphy		$ 758,639
Net Income Attributable to Murphy per Common Share
Basic (in USD per share)		$ 4.39
Diluted (in USD per share)		$ 4.35