v2.4.0.8
Contingencies (Details) (USD $)
In Millions, unless otherwise specified
0 Months Ended 81 Months Ended
Jan. 23, 2013
lawsuit
Sep. 30, 2013
lawsuit
Commitments And Contingencies [Line Items]    
Number of lawsuits   45
Number of cases remanded for trial 3  
Workers' compensation deductible   1,000,000
Workers' compensation accrued liability   $ 4.0
Outstanding contingent liabilities   $ 18.6
Murphy Oil USA, Inc. [Member]
   
Commitments And Contingencies [Line Items]    
Number of lawsuits   8