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Credit Facilities - Revolving Credit Facility (Details)
 12 Months Ended
Dec. 31, 2018
USD ($)
tranche
financial_institution
Dec. 31, 2017
USD ($)
Line of Credit Facility [Line Items]    
Offset account related to floorplan notes payable $ 33,637,000 $ 86,547,000
Revolving Credit Facility    
Line of Credit Facility [Line Items]    
Maximum borrowing capacity under line of credit facility $ 1,800,000,000  
Number of financial institutions | financial_institution 24  
Number of manufacturer-affiliated finance companies | financial_institution 6  
Number of tranches | tranche 2  
Maximum potential commitment $ 2,100,000,000  
Unamortized costs 3,000,000  
Maximum restricted payments 208,500,000  
Restricted payment basket amount 72,400,000  
Floorplan Line    
Line of Credit Facility [Line Items]    
Maximum borrowing capacity under line of credit facility $ 1,750,000,000  
Commitment fee rate 0.15%  
Maximum period for outstanding borrowing 1 year  
Outstanding borrowing balance $ 1,200,000,000  
Available borrowing capacity 247,600,000  
Offset account related to floorplan notes payable $ 33,637,000  
Weighted average interest rate 3.70% 2.70%
Acquisition Line    
Line of Credit Facility [Line Items]    
Maximum borrowing capacity under line of credit facility $ 360,000,000  
Line of credit facility minimum borrowing capacity $ 50,000,000  
Basis spread on interest rate 1.50%  
Restricted payment maximum $ 50,000,000  
Outstanding borrowing balance 31,800,000 $ 27,000,000
Available borrowing capacity $ 277,600,000  
Debt interest rate 2.47% 2.25%
Letters of credit outstanding $ 25,300,000  
Acquisition Line | Minimum    
Line of Credit Facility [Line Items]    
Commitment fee rate 0.20%  
Acquisition Line | Maximum    
Line of Credit Facility [Line Items]    
Commitment fee rate 0.45%  
Acquisition Line | U.S. Dollars | Minimum    
Line of Credit Facility [Line Items]    
Basis spread on interest rate 0.00%  
Acquisition Line | U.S. Dollars | Maximum    
Line of Credit Facility [Line Items]    
Basis spread on interest rate 1.00%  
Acquisition Line | Euros or Pound Sterling    
Line of Credit Facility [Line Items]    
Maximum borrowing capacity under line of credit facility $ 125,000,000  
Acquisition Line | Euros or Pound Sterling | Minimum    
Line of Credit Facility [Line Items]    
Basis spread on interest rate 1.25%  
Acquisition Line | Euros or Pound Sterling | Maximum    
Line of Credit Facility [Line Items]    
Basis spread on interest rate 2.50%  
New Vehicles    
Line of Credit Facility [Line Items]    
Basis spread on interest rate 1.25%  
Used Vehicles    
Line of Credit Facility [Line Items]    
Basis spread on interest rate 1.50%