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
|
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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 |