v2.4.0.8
Put and Call Option Contracts (Detail)
9 Months Ended
Sep. 30, 2013
gal
Derivative [Line Items]  
Total fuel price derivative instruments, gallons 54,355,000 [1]
Unleaded Fuel
 
Derivative [Line Items]  
Total fuel price derivative instruments, gallons 36,953,000 [1]
Diesel
 
Derivative [Line Items]  
Total fuel price derivative instruments, gallons 17,402,000 [1]
[1] The settlement of the put and call option contracts is based upon the New York Mercantile Exchange’s New York Harbor Reformulated Gasoline Blendstock for Oxygen Blending and the U.S. Department of Energy’s weekly retail on-highway diesel fuel price for the month.