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Goodwill and Other Intangible Assets Components of Other Intangible Assets (Detail) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Amortizable:    
Gross amortized other intangible assets $ 191,728 $ 193,137
Accumulated Amortization (87,729) (76,634)
Net amortized other intangible assets 103,999 116,503
Total other intangible assets, net $ 334,345 347,212
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 $ 168,419 169,694
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 $ 22,769 22,903
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 $ 230,346 $ 230,709