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 ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Condensed Unaudited Quarterly Financial Data [Line Items]                  
Asset impairment charges $ 17,700,000 $ 1,900,000 $ 15,600,000   $ 10,300,000 $ 3,600,000 $ 20,768,000 $ 29,514,000 $ 9,394,000
Lease exit accrual adjustments and charges         2,600,000 4,800,000      
Executive transition costs       $ 1,600,000     6,300,000 1,600,000 1,300,000
Storm-related physical damage       1,200,000 3,100,000        
Long-term compensation costs   $ 6,300,000     23,300,000 9,200,000   32,500,000  
Tax benefit related to deferred income tax impact of change in U.S. federal tax income rate               28,400,000  
Pre-tax charge related to the extinguishment of debt 7,200,000           $ (6,690,000) $ 0 $ (14,607,000)
Net benefit from legal settlements           1,500,000      
7.0% Senior Subordinated Notes Expired                  
Condensed Unaudited Quarterly Financial Data [Line Items]                  
Stated interest rate on debt agreement   5.00%              
Franchised dealerships                  
Condensed Unaudited Quarterly Financial Data [Line Items]                  
Lease exit accrual adjustments and charges     $ 800,000            
Pre-tax gain (loss) on disposal 29,300,000 $ 46,700,000   300,000 38,000,000.0 1,200,000      
Gain (loss) on disposal of dealerships (1) $ 29,300,000 $ 46,700,000   $ 300,000 $ 38,000,000.0 $ 1,200,000