v2.4.0.8
Document And Entity Information
9 Months Ended
Sep. 30, 2013
Document And Entity Information [Abstract]  
Entity Registrant Name Murphy USA Inc.
Document Type 10-Q
Amendment Flag false
Document Period End Date Sep. 30, 2013
Entity Central Index Key 0001573516
Current Fiscal Year End Date --12-31
Entity Filer Category Non-accelerated Filer
Document Fiscal Year Focus 2013
Document Fiscal Period Focus Q3
Entity Common Stock, Shares Outstanding 46,743,316