Components of Other Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Intangible Assets by Major Class [Line Items]
Amortizable, Gross Carrying Amount	$ 77,869	$ 75,091
Accumulated Amortization	(23,158)	(13,268)	(4,015)
Amortizable, Net	54,711	61,823
Total other intangible assets, Gross Carrying Amount	124,093	116,279	54,907
Total other intangible assets, net	100,935	103,011
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	(293)	(185)
Amortizable, Net	247	355
Dealer/customer related
Intangible Assets by Major Class [Line Items]
Total Estimated Life (years)	7 years	7 years
Amortizable, Gross Carrying Amount	62,758	59,244
Accumulated Amortization	(16,361)	(8,608)
Amortizable, Net	46,397	50,636
Developed technology
Intangible Assets by Major Class [Line Items]
Amortizable, Gross Carrying Amount	14,571	15,307
Accumulated Amortization	(6,504)	(4,475)
Amortizable, Net	8,067	10,832
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	46,224	41,188
Non-amortizable, Net	$ 46,224	$ 41,188