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Goodwill and Other Intangible Assets Components of Other Intangible Assets (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Amortizable:    
Gross amortized other intangible assets $ 521,092 $ 522,354
Accumulated Amortization (103,182) (94,136)
Net amortized other intangible assets 417,910 428,218
Total other intangible assets, net $ 859,961 870,517
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 $ 505,183 506,401
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 $ 13,279 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 $ 442,051 $ 442,299