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Credit Facilities - Ford Motor Credit Company Facility (Details) - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Line of Credit Facility [Line Items]    
Floorplan notes payable — manufacturer affiliates $ 417,924,000 $ 397,183,000
FMCC offset 100,000 $ 22,500,000
FMCC Facility    
Line of Credit Facility [Line Items]    
Maximum borrowing capacity under line of credit facility $ 300,000,000  
Cancellation of agreement 30 days  
Floorplan notes payable — manufacturer affiliates $ 160,700,000  
Available borrowing capacity $ 139,300,000  
Basis spread on interest rate 1.50%  
Debt interest rate 7.00% 6.00%