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, 2020
Dec. 31, 2019
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   245,500,000  
Maximum borrowing capacity   295,500,000  
Borrowing base   227,700,000  
2016 Revolving Credit Facility   0  
Letters of credit outstanding amount   13,000,000.0  
Borrowing availability amount   214,700,000  
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   966,000,000.0  
Maximum borrowing capacity   $ 1,216,000,000  
Revolving Credit Facility | 2016 Used Vehicle Floor Plan Facility      
Line of Credit Facility [Line Items]      
Allocation of credit facility increase, percentage   40.00%