Annual report pursuant to Section 13 and 15(d)

Summary of Quarterly Financial Data (Unaudited) - Additional Information (Details)

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Summary of Quarterly Financial Data (Unaudited) - Additional Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Condensed Unaudited Quarterly Financial Data [Line Items]                      
Asset impairment charges $ 15,600   $ 10,300 $ 3,600 $ 6,100 $ 200 $ 2,600 $ 500 $ 29,514 $ 9,394 $ 8,063
Lease exit accrual adjustments and charges     2,600 4,800     1,000        
Executive transition costs   $ 1,600                  
Storm-related physical damage   1,200     1,400 3,000 4,600 2,400      
Long-term compensation costs     23,300 9,200              
Storm-related physical damage and legal costs     3,100                
Legal costs       $ 1,500              
Tax benefit related to deferred income tax impact of change in U.S. federal tax income rate         (28,400)         28,400  
Legal and other         1,500 1,000 $ 1,000        
Pre-tax charge related to the extinguishment of debt               15,300 $ 0 $ (14,607) $ 0
Net benefit from legal settlements               $ 1,100      
7.0% Senior Subordinated Notes Expired                      
Condensed Unaudited Quarterly Financial Data [Line Items]                      
Stated interest rate on debt agreement       7.00%              
Franchised dealerships                      
Condensed Unaudited Quarterly Financial Data [Line Items]                      
Lease exit accrual adjustments and charges $ 800                    
Costs to sell   $ 300                  
Pre-tax gain (loss) on disposal     38,000 $ 1,200 1,500 8,500          
Gain (loss) on disposal     $ 38,000 $ 1,200 $ 1,500 $ 8,500