Goodwill and Other Intangible Assets Components of Other Intangible Assets (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Amortizable:
Gross amortized other intangible assets	$ 100,314	$ 86,880
Accumulated Amortization	(37,817)	(33,728)
Net amortized other intangible assets	62,497	53,152
Total other intangible assets, net	$ 116,572	105,103
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	$ 80,358	67,079
Developed technology
Amortizable:
Gross amortized other intangible assets	$ 19,416	19,261
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	$ 54,075	$ 51,951