Business Combinations (Acquired Intangible Assets And Weighted-Average Useful Lives Of triVIN Holdings, Inc. Acquisition) (Details) (Dealer Track Processing Solutions Inc [Member], USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2011
Acquired Finite-Lived Intangible Assets [Line Items]
Total acquired identifiable intangible assets, Amount	$ 83,760
Weighted-average useful life of acquired identifiable intangible assets (years)	5.7
Customer Relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Total acquired identifiable intangible assets, Amount	43,900
Weighted-average useful life of acquired identifiable intangible assets (years)	6.4
Technology [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Total acquired identifiable intangible assets, Amount	27,500
Weighted-average useful life of acquired identifiable intangible assets (years)	5.0
Non-Compete Agreements [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Total acquired identifiable intangible assets, Amount	5,180
Weighted-average useful life of acquired identifiable intangible assets (years)	3.0
State DMV Contractual Relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Total acquired identifiable intangible assets, Amount	6,190
Weighted-average useful life of acquired identifiable intangible assets (years)	6.0
Trade Names [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Total acquired identifiable intangible assets, Amount	$ 990
Weighted-average useful life of acquired identifiable intangible assets (years)	3.0