Quarterly report pursuant to Section 13 or 15(d)

Long-Term Debt - 2016 Credit Facilities (Details)

v3.20.1
Long-Term Debt - 2016 Credit Facilities (Details) - USD ($)
3 Months Ended
Nov. 30, 2016
Mar. 31, 2020
Dec. 31, 2019
2016 Revolving Credit Facility      
Line of Credit Facility [Line Items]      
2016 Revolving Credit Facility   $ 210,000,000 $ 0
Revolving Credit Facility | 2016 Revolving Credit Facility      
Line of Credit Facility [Line Items]      
Line of Credit Facility, Increase (Decrease), Net $ 25,000,000.0    
Current borrowing capacity   250,000,000.0  
Maximum borrowing capacity   300,000,000.0  
Borrowing base   196,500,000  
Letters of credit outstanding amount   13,000,000.0  
Borrowing availability amount   0  
Revolving Credit Facility | 2016 Credit Facilities      
Line of Credit Facility [Line Items]      
2016 Revolving Credit Facility   210,000,000.0  
Revolving Credit Facility | 2016 New Vehicle Floor Plan Facility and 2016 Used Vehicle Floor Plan Facility      
Line of Credit Facility [Line Items]      
Current borrowing capacity   1,015,000,000.000  
Maximum borrowing capacity   $ 1,265,000,000  
Maximum aggregate commitments allocated to commitments under the 2016 Used Vehicle Floor Plan Facility   30.00%  
Revolving Credit Facility | Two Thousand Sixteen Vehicle Floor Plan Facility [Member]      
Line of Credit Facility [Line Items]      
Line of Credit Facility, Increase (Decrease), Net $ 215,000,000.0