Components of Other Intangible Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Intangible Assets by Major Class [Line Items]
Amortizable, Gross Carrying Amount	$ 86,880	$ 77,869
Accumulated Amortization	(33,728)	(23,158)	$ (13,268)
Amortizable, Net	53,152	54,711
Total other intangible assets, Gross Carrying Amount	138,831	124,093	$ 116,279
Total other intangible assets, net	$ 105,103	$ 100,935
Non-compete agreements
Intangible Assets by Major Class [Line Items]
Total Estimated Life (years)	5 years	5 years
Amortizable, Gross Carrying Amount	$ 540	$ 540
Accumulated Amortization	(401)	(293)
Amortizable, Net	$ 139	$ 247
Dealer/customer related
Intangible Assets by Major Class [Line Items]
Total Estimated Life (years)	7 years	7 years
Amortizable, Gross Carrying Amount	$ 67,079	$ 62,758
Accumulated Amortization	(24,069)	(16,361)
Amortizable, Net	43,010	46,397
Developed technology
Intangible Assets by Major Class [Line Items]
Amortizable, Gross Carrying Amount	19,261	14,571
Accumulated Amortization	(9,258)	(6,504)
Amortizable, Net	$ 10,003	$ 8,067
Developed technology | Minimum
Intangible Assets by Major Class [Line Items]
Total Estimated Life (years)	5 years	5 years
Developed technology | Maximum
Intangible Assets by Major Class [Line Items]
Total Estimated Life (years)	7 years	7 years
Non-amortizable—brand/trade names
Intangible Assets by Major Class [Line Items]
Non-amortizable, Gross Carrying Amount	$ 51,951	$ 46,224
Non-amortizable, Net	$ 51,951	$ 46,224