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Segment Reporting (Details 3) (USD $)
Sep. 30, 2012
Dec. 31, 2011
Sep. 30, 2010
ExxonMobil
Mar. 02, 2012
Alliance
Sep. 30, 2012
Gasoline Distribution and Station Operations segment
ExxonMobil
Sep. 30, 2010
Gasoline Distribution and Station Operations segment
ExxonMobil
Sep. 30, 2012
Gasoline Distribution and Station Operations segment
Alliance
Mar. 02, 2012
Gasoline Distribution and Station Operations segment
Alliance
Segment Assets                
Assets acquired in connection with acquisition     $ 232,300,000 $ 395,600,000        
Property and equipment       294,894,000   171,300,000   294,900,000
Net book value of assets $ 700,913,000 $ 408,850,000     $ 127,700,000   $ 288,100,000