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Goodwill (Tables)
12 Months Ended
Dec. 31, 2011
Goodwill [Abstract]  
Changes In Carrying Amount Of Goodwill
       
Goodwill, gross, as of January 1, 2010   $ 134,747  
Accumulated impairment losses as of January 1, 2010      
Goodwill, net, as of January 1, 2010   $ 134,747  
         
Impact of change in Canadian dollar exchange rate     1,301  
Other     360  
Goodwill, gross, as of December 31, 2010   $ 136,408  
         
Acquisition of DealerTrack Processing Solutions     74,217  
Acquisition of Automotive Information Center     490  
Acquisition of eCarList     23,427  
Disposal of ALG     (33,127 )
Impact of change in Canadian dollar exchange rate     (575 )
Goodwill, gross, as of December 31, 2011   $ 200,840  
         
Accumulated impairment losses as of December 31, 2011      
Goodwill, net, as of December 31, 2011   $ 200,840