Goodwill and Other Intangible Assets Components of Other Intangible Assets (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Amortizable:
Gross amortized other intangible assets	$ 84,777	$ 77,869
Accumulated Amortization	(31,039)	(23,158)
Net amortized other intangible assets	53,738	54,711
Total other intangible assets, net	$ 102,437	100,935
Non-compete agreements
Amortizable:
Total estimated life	5 years
Gross amortized other intangible assets	$ 540	540
Dealer/customer related
Amortizable:
Total estimated life	7 years
Gross amortized other intangible assets	$ 64,838	62,758
Developed technology
Amortizable:
Gross amortized other intangible assets	$ 19,399	14,571
Developed technology | Minimum
Amortizable:
Total estimated life	5 years
Developed technology | Maximum
Amortizable:
Total estimated life	7 years
Brand names
Non-amortizable—indefinite lived:
Non-amortizable, Net	$ 48,699	$ 46,224