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Credit Facilities and Long-term Debt (Narrative) (Details)
 6 Months Ended
Jul. 24, 2017
USD ($)
Jun. 30, 2018
USD ($)
Jun. 25, 2018
USD ($)
financial_institution
finance_companies
Dec. 31, 2017
USD ($)
Debt Instrument [Line Items]        
Total long-term debt outstanding   $ 1,325,750,000   $ 1,054,271,000
Line of Credit        
Debt Instrument [Line Items]        
Principal Reduction Accounts Maximum Deposit Amount   50,000,000    
Principal Reduction Accounts Outstanding Amount   0    
Line of Credit | Syndicated Credit Facility        
Debt Instrument [Line Items]        
Number Of Financial Institutions | financial_institution     20  
Number Of Manufacturer Affiliated Finance Companies | finance_companies     7  
Line of Credit Facility, Maximum Borrowing Capacity   2,600,000,000.0   2,400,000,000.0
Line Of Credit Facility, Accordion Feature, Higher Borrowing Capacity Option     $ 3,000,000,000.0  
Senior Notes | Senior Notes Due 2025        
Debt Instrument [Line Items]        
Total long-term debt outstanding $ 300,000,000 $ 300,000,000   300,000,000
Stated interest rate (percent) 5.25% 5.25%    
Redemption percentage price (percent) 100.00%      
Percentage of principal amount redeemable (percent) 101.00%      
Used Vehicle Inventory Financing | Line of Credit        
Debt Instrument [Line Items]        
Total long-term debt outstanding   $ 50,000,000   177,222,000
Used Vehicle Inventory Financing | Line of Credit | Syndicated Credit Facility        
Debt Instrument [Line Items]        
Line of Credit Facility, Maximum Borrowing Capacity     $ 135,000,000  
Line Of Credit Facility, Option To Reallocate Commitment, Maximum Aggregate Commitment Threshold Percentage     16.50%  
Revolving Credit Facility | Line of Credit        
Debt Instrument [Line Items]        
Annual interest rate   3.59%    
Total long-term debt outstanding   $ 320,953,000   $ 94,568,000
Revolving Credit Facility | Line of Credit | Syndicated Credit Facility        
Debt Instrument [Line Items]        
Line of Credit Facility, Maximum Borrowing Capacity     $ 450,000,000  
Line Of Credit Facility, Option To Reallocate Commitment, Maximum Aggregate Commitment Threshold Percentage     18.75%  
New Vehicle Floor Plan | Line of Credit        
Debt Instrument [Line Items]        
Annual interest rate   3.34%    
Reserve Commitment Percent   95.00%    
Maximum Reserve Amount If Reserve Is Required   $ 15,000,000    
New Vehicle Floor Plan | Line of Credit | Syndicated Credit Facility        
Debt Instrument [Line Items]        
Line of Credit Facility, Maximum Borrowing Capacity     $ 2,000,000,000.0  
Line Of Credit Facility, Accordian Feature, Increase Limit     $ 400,000,000  
London Interbank Offered Rate (LIBOR) | Used Vehicle Inventory Financing | Line of Credit        
Debt Instrument [Line Items]        
Debt Instrument, Basis Spread on Variable Rate   1.50%    
London Interbank Offered Rate (LIBOR) | New Vehicle Floor Plan | Line of Credit        
Debt Instrument [Line Items]        
Debt Instrument, Basis Spread on Variable Rate   1.25%    
Minimum | London Interbank Offered Rate (LIBOR) | Revolving Credit Facility | Line of Credit        
Debt Instrument [Line Items]        
Debt Instrument, Basis Spread on Variable Rate   1.25%    
Maximum | London Interbank Offered Rate (LIBOR) | Revolving Credit Facility | Line of Credit        
Debt Instrument [Line Items]        
Debt Instrument, Basis Spread on Variable Rate   2.25%