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Goodwill and Other Intangible Assets - Components of Other Intangible Assets (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Intangible Assets by Major Class [Line Items]      
Gross Carrying Amount $ 472,800 $ 514,800  
Accumulated Amortization (120,700) (126,500) $ (94,100)
Net 352,100 388,300  
Total other intangible assets, Gross Carrying Amount 807,100 956,800 $ 964,700
Total other intangible assets, net $ 686,400 $ 830,300  
Non-compete agreements      
Intangible Assets by Major Class [Line Items]      
Estimated Life (Years) 4 years 4 years  
Gross Carrying Amount $ 2,600 $ 2,600  
Accumulated Amortization (1,600) (1,000)  
Net 1,000 1,600  
Dealer/customer related      
Intangible Assets by Major Class [Line Items]      
Gross Carrying Amount 460,300 499,500  
Accumulated Amortization (110,800) (116,100)  
Net $ 349,500 $ 383,400  
Dealer/customer related | Minimum      
Intangible Assets by Major Class [Line Items]      
Estimated Life (Years) 5 years 5 years  
Dealer/customer related | Maximum      
Intangible Assets by Major Class [Line Items]      
Estimated Life (Years) 20 years 20 years  
Developed technology      
Intangible Assets by Major Class [Line Items]      
Gross Carrying Amount $ 9,900 $ 12,700  
Accumulated Amortization (8,300) (9,400)  
Net $ 1,600 $ 3,300  
Developed technology | Minimum      
Intangible Assets by Major Class [Line Items]      
Estimated Life (Years) 5 years 5 years  
Developed technology | Maximum      
Intangible Assets by Major Class [Line Items]      
Estimated Life (Years) 7 years 7 years  
Non-amortizable—brand/trade names      
Intangible Assets by Major Class [Line Items]      
Non-amortizable—brand/trade names $ 334,300 $ 442,000  
Non-amortizable, Net $ 334,300 $ 442,000