Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Additional Information (Details)

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Summary of Significant Accounting Policies - Additional Information (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Mar. 31, 2019
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Schedule of Equity Method Investments [Line Items]            
Effective Income Tax Rate Reconciliation, Tax Settlement, State and Local, Amount   $ 3,400,000     $ 200,000  
Percentage of dealership that is accounted for under the equity method 50.00%     50.00%    
Effective tax rate from continuing operations 24.50% 17.20%   25.00% 18.30%  
Tax expense for uncertain tax positions         $ 1,400,000  
Discrete benefit related to vested or exercised stock compensation   $ 300,000   $ 2,800,000 200,000  
Discrete charge related to non-deductible asset impairment charge $ 1,300,000          
Income benefit (37,030,000) (6,437,000)   (55,893,000) 37,680,000  
Impairment charges $ 0 833,000 $ 800,000 $ 0 268,833,000  
Goodwill, Impairment Loss         268,000,000.0  
Income Tax Benefit Goodwill Impairment         55,800,000  
Effective Income Tax Rate Reconciliation, Tax Settlement, State and Local, Amount   $ 3,400,000     $ 200,000  
Dealership            
Schedule of Equity Method Investments [Line Items]            
Percentage of dealership that is accounted for under the equity method 50.00%     50.00%    
ASU 2014-09 | Finance, insurance and other, net            
Schedule of Equity Method Investments [Line Items]            
Contract assets $ 22,000,000.0     $ 22,000,000.0   $ 21,700,000