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Acquisitions - Summary of Acquisitions (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Business Acquisition [Line Items]      
Cash paid, net of cash acquired $ 460,394 $ 234,700 $ 71,615
Property and equipment transferred 0 2,637 0
Equity securities issued 2,137 0 0
Debt issued 1,748 0  
Total 464,279 237,337  
Goodwill 256,320 259,399 $ 213,220
Acquisitions 2017      
Business Acquisition [Line Items]      
Trade receivables, net 46,864    
Inventories 189,747    
Franchise value 0    
Property and equipment 146,835    
Other assets 187,549    
Floor plan notes payable (72,495)    
Debt and capital lease obligations (13,727)    
Other liabilities (20,494)    
Assets acquired and liabilities assumed, excluding goodwill 464,279    
Goodwill 0    
Assets acquired and liabilities assumed, net $ 464,279    
Acquisitions 2016      
Business Acquisition [Line Items]      
Trade receivables, net   0  
Inventories   148,915  
Franchise value   27,087  
Property and equipment   75,345  
Other assets   990  
Floor plan notes payable   (30,134)  
Debt and capital lease obligations   (22,813)  
Other liabilities   (9,450)  
Assets acquired and liabilities assumed, excluding goodwill   189,940  
Goodwill   47,397  
Assets acquired and liabilities assumed, net   $ 237,337