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Goodwill and Other Intangible Assets Components of Other Intangible Assets (Detail) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2020
Dec. 31, 2019
Amortizable:    
Gross amortized other intangible assets $ 472,500 $ 514,800
Accumulated Amortization (111,800) (126,500)
Net amortized other intangible assets 360,700 388,300
Total other intangible assets, net $ 694,400 830,300
Non-compete agreements    
Amortizable:    
Total estimated life 4 years  
Gross amortized other intangible assets $ 2,600 2,600
Dealer/customer related    
Amortizable:    
Gross amortized other intangible assets $ 460,100 499,500
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 $ 9,800 12,700
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 $ 333,700 $ 442,000