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Goodwill (Tables)
9 Months Ended
Sep. 30, 2011
Goodwill [Abstract] 
Changes In Carrying Amount Of Goodwill
Goodwill, gross, as of January 1, 2011
 
$
136,408
 
Accumulated impairment losses as of January 1, 2011
   
 
Goodwill, net, as of January 1, 2011
 
$
136,408
 
         
Acquisition of DealerTrack Processing Solutions
   
74,217
 
Acquisition of Automotive Information Center
   
490
 
Acquisition of eCarList
   
23,427
 
Impact of change in Canadian dollar exchange rate
 
 
(1,114
)
Goodwill, gross, as of September 30, 2011
 
$
233,428
 
         
Accumulated impairment losses as of September 30, 2011
   
 
Goodwill, net, as of September 30, 2011
 
$
233,428