Goodwill and Other Intangible Assets Components of Other Intangible Assets (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Amortizable:
Gross amortized other intangible assets	$ 190,832	$ 191,425
Accumulated Amortization	(61,769)	(49,130)
Net amortized other intangible assets	129,063	142,295
Total other intangible assets, net	$ 359,145	371,416
Non-compete agreements
Amortizable:
Total estimated life	5 years
Gross amortized other intangible assets	$ 540	540
Dealer/customer related
Amortizable:
Gross amortized other intangible assets	$ 167,537	164,837
Dealer/customer related | Minimum
Amortizable:
Total estimated life	5 years
Dealer/customer related | Maximum
Amortizable:
Total estimated life	10 years
Developed technology
Amortizable:
Gross amortized other intangible assets	$ 22,755	26,048
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	$ 230,082	$ 229,121