Annual report pursuant to Section 13 and 15(d)

Business Acquisitions and Dispositions - Additional Information (Details)

v3.10.0.1
Business Acquisitions and Dispositions - Additional Information (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
Dealerships
Store
Franchise
Dec. 31, 2017
USD ($)
Dealerships
Dec. 31, 2016
USD ($)
Store
Dealerships
Business Acquisition [Line Items]      
Number of franchise dealerships opened 1    
Number of stores opened | Store 3    
Number of franchises disposed 7 3 0
Cash generated from disposition | $ $ 128,700 $ 38,200  
Number of franchises terminated 1    
Number of terminated stores | Store 4    
Number of dealerships held for sale | Franchise 0    
Pre-owned vehicle store      
Business Acquisition [Line Items]      
Business acquisition, consideration amount | $   $ 76,600  
Number of businesses acquired     1
Operating locations and related real estate      
Business Acquisition [Line Items]      
Business acquisition, consideration amount | $     $ 15,900
Operating locations | Store     3