Goodwill and Other Intangible Assets - Components of Other Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Sep. 30, 2013	Dec. 31, 2012
Amortized:
Gross amortized other intangible assets	$ 71,960	$ 28,216
Accumulated Amortization	(10,420)	(4,015)
Net amortized other intangible assets	61,540	24,201
Total other intangible assets, net	102,461	50,892
Non-compete agreements
Amortized:
Total estimated life	5 years
Gross amortized other intangible assets	540	540
Dealer/customer related
Amortized:
Total estimated life	7 years
Gross amortized other intangible assets	58,381	14,702
Developed technology
Amortized:
Gross amortized other intangible assets	13,039	12,974
Developed technology | Minimum
Amortized:
Total estimated life	5 years
Developed technology | Maximum
Amortized:
Total estimated life	7 years
Brand names
Non-amortizable - indefinite lived:
Non-amortizable, Net	$ 40,921	$ 26,691