Annual report pursuant to Section 13 and 15(d)

Long-Term Debt Long-Term Debt - 2016 Credit Facilities (Details)

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Long-Term Debt Long-Term Debt - 2016 Credit Facilities (Details) - USD ($)
12 Months Ended
Nov. 30, 2016
Dec. 31, 2019
Dec. 31, 2018
Line of Credit Facility [Line Items]      
Maximum Borrowing 2019 Mortgage Facility   $ 112,200,000  
2016 Revolving Credit Facility      
Line of Credit Facility [Line Items]      
2016 Revolving Credit Facility   0 $ 0
Revolving Credit Facility | 2016 Revolving Credit Facility      
Line of Credit Facility [Line Items]      
Increased availability under borrowing facility $ 25,000,000.0    
Current borrowing capacity   250,000,000.0  
Maximum borrowing capacity   300,000,000.0  
Borrowing base   245,300,000  
2016 Revolving Credit Facility   0  
Letters of credit outstanding amount   14,600,000  
Borrowing availability amount   230,700,000  
Revolving Credit Facility | 2016 Floor Plan Facilities      
Line of Credit Facility [Line Items]      
Increased availability under borrowing facility $ 215,000,000.0    
Current borrowing capacity   1,015,000,000.000  
Maximum borrowing capacity   $ 1,265,000,000  
Revolving Credit Facility | 2016 Used Vehicle Floor Plan Facility      
Line of Credit Facility [Line Items]      
Allocation of credit facility increase, percentage   30.00%