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Intangible Assets (Tables)
 6 Months Ended
Jun. 30, 2011
Intangible Assets (Tables) [Abstract]  
Summary of the changes in the carrying amount of goodwill and franchise value
                 
            Franchise  
    Goodwill     Value  
Balance, January 1, 2011
  $ 808,488     $ 203,401  
Additions
    7,120       —  
Foreign currency translation
    11,361       2,544  
 
           
Balance, June 30, 2011
  $ 826,969     $ 205,945