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Segment Information (Tables)
9 Months Ended
Sep. 30, 2011
Segment Information [Abstract] 
Revenues and adjusted segment income by reportable segment
Three Months Ended September 30
                         
            PAG        
    Retail     Investments     Total  
Revenues
                       
2011
  $ 2,951,046     $     $ 2,951,046  
2010
    2,669,773             2,669,773  
Adjusted segment income
                       
2011
    61,925       8,475       70,400  
2010
    45,153       6,765       51,918  
Nine Months Ended September 30
                         
            PAG        
    Retail     Investments     Total  
Revenues
                       
2011
  $ 8,623,710     $     $ 8,623,710  
2010
    7,697,770             7,697,770  
Adjusted segment income
                       
2011
    171,229       15,867       187,096  
2010
    127,077       10,362       137,439  
Reconciliation of total adjusted segment income to consolidated income from continuing operations before income taxes
                                 
    Three Months Ended     Nine Months Ended  
    September 30,     September 30,  
    2011     2010     2011     2010  
Adjusted segment income
  $ 70,400     $ 51,918     $ 187,096     $ 137,439  
Gain on debt repurchase
          607             1,634  
 
                       
 
                               
Income from continuing operations before income taxes
  $ 70,400     $ 52,525     $ 187,096     $ 139,073