Quarterly report pursuant to Section 13 or 15(d)

Business Acquisitions and Dispositions - Additional Information (Details)

v3.8.0.1
Business Acquisitions and Dispositions - Additional Information (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2018
USD ($)
Franchise
Business
Mar. 31, 2017
USD ($)
Franchise
Business
Business Combinations [Abstract]    
Number of acquired franchises | Business 0 0
Business Acquisition [Line Items]    
Number of franchises disposed   0
Proceeds from sales of dealerships | $ $ 7,461 $ 0
Number of franchises terminated 1  
Luxury franchise    
Business Acquisition [Line Items]    
Number of franchises disposed 1  
Pre-Owned Stores Segment    
Business Acquisition [Line Items]    
Number of franchises ceased operations 1