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Goodwill and Other Intangible Assets Components of Other Intangible Assets (Detail) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Amortizable:    
Gross amortized other intangible assets $ 520,938 $ 522,354
Accumulated Amortization (122,582) (94,136)
Net amortized other intangible assets 398,356 428,218
Total other intangible assets, net $ 840,102 870,517
Non-compete agreements    
Amortizable:    
Total estimated life 4 years  
Gross amortized other intangible assets $ 2,630 2,630
Dealer/customer related    
Amortizable:    
Gross amortized other intangible assets $ 505,150 506,401
Dealer/customer related | Minimum    
Amortizable:    
Total estimated life 5 years  
Dealer/customer related | Maximum    
Amortizable:    
Total estimated life 20 years  
Developed technology    
Amortizable:    
Gross amortized other intangible assets $ 13,158 13,323
Developed technology | Minimum    
Amortizable:    
Total estimated life 5 years  
Developed technology | Maximum    
Amortizable:    
Total estimated life 7 years  
Brand/trade names    
Non-amortizable—indefinite lived:    
Non-amortizable, Net $ 441,746 $ 442,299