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Derivatives and Hedging-Disclosures and Fair Value Measurements - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
gal
Dec. 31, 2011
gal
Derivative Instruments and Hedging Activities Disclosure [Line Items]    
Aggregated cash posted as collateral in normal course of business 1.4  
Hedging positions secured under credit facility 13.5  
Call Option
    
Derivative Instruments and Hedging Activities Disclosure [Line Items]    
Derivative activity volume 3,800,000 4,000,000
Put Option
    
Derivative Instruments and Hedging Activities Disclosure [Line Items]    
Derivative activity volume 7,800,000 5,800,000
Inventory
    
Derivative Instruments and Hedging Activities Disclosure [Line Items]    
Derivative activity volume 2,400,000 2,000,000
Swap Contract to Buy Heating Oil
    
Derivative Instruments and Hedging Activities Disclosure [Line Items]    
Derivative activity volume 10,200,000 8,100,000
Synthetic calls
    
Derivative Instruments and Hedging Activities Disclosure [Line Items]    
Derivative activity volume 84,800,000 90,200,000
Future Contract To Buy Heating Oil
    
Derivative Instruments and Hedging Activities Disclosure [Line Items]    
Derivative activity volume 66,300,000 17,500,000
Future Contract To Sell Heating Oil
    
Derivative Instruments and Hedging Activities Disclosure [Line Items]    
Derivative activity volume 76,800,000 26,500,000
Swap Contract To Buy Diesel
    
Derivative Instruments and Hedging Activities Disclosure [Line Items]    
Derivative activity volume 1,000,000 1,000,000
Swap Contract To Buy Diesel | NYS ultra-low sulfur heating oil customers
    
Derivative Instruments and Hedging Activities Disclosure [Line Items]    
Derivative activity volume 13,000,000  
Swap Contracts To Sell Heating Oil
    
Derivative Instruments and Hedging Activities Disclosure [Line Items]    
Derivative activity volume 30,800,000 27,800,000
Swap Contracts To Sell Heating Oil | NYS ultra-low sulfur heating oil customers
    
Derivative Instruments and Hedging Activities Disclosure [Line Items]    
Derivative activity volume 13,000,000  
Swap Contract To Buy Gasoline
    
Derivative Instruments and Hedging Activities Disclosure [Line Items]    
Derivative activity volume 1,100,000 1,300,000