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- Components of Other Intangible Assets (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Intangible Assets by Major Class [Line Items]      
Amortizable, Gross Carrying Amount $ 191,425 $ 86,880  
Accumulated Amortization (49,130) (33,728) $ (23,158)
Amortizable, Net 142,295 53,152  
Total other intangible assets, Gross Carrying Amount 420,546 138,831 $ 124,093
Total other intangible assets, net $ 371,416 $ 105,103  
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 (485) (401)  
Amortizable, Net 55 $ 139  
Dealer/customer related      
Intangible Assets by Major Class [Line Items]      
Total Estimated Life (years)   7 years  
Amortizable, Gross Carrying Amount 164,837 $ 67,079  
Accumulated Amortization (35,907) (24,069)  
Amortizable, Net $ 128,930 43,010  
Dealer/customer related | Minimum      
Intangible Assets by Major Class [Line Items]      
Total Estimated Life (years) 5 years    
Dealer/customer related | Maximum      
Intangible Assets by Major Class [Line Items]      
Total Estimated Life (years) 10 years    
Developed technology      
Intangible Assets by Major Class [Line Items]      
Amortizable, Gross Carrying Amount $ 26,048 19,261  
Accumulated Amortization (12,738) (9,258)  
Amortizable, Net $ 13,310 $ 10,003  
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 $ 229,121 $ 51,951  
Non-amortizable, Net $ 229,121 $ 51,951