Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Cumulative Effect of Adjustments for Adoption of ASC 606 (Details)

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Summary of Significant Accounting Policies - Cumulative Effect of Adjustments for Adoption of ASC 606 (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Revenues:          
Revenues $ 3,352,246,000 $ 2,111,886,000 $ 6,139,043,000 $ 4,419,942,000  
Cost of Sales:          
Cost of Sales (2,841,438,000) (1,804,503,000) (5,227,342,000) (3,761,981,000)  
Operating income (loss) 165,427,000 53,544,000 253,277,000 (168,331,000)  
Assets:          
Receivables, net 356,850,000   356,850,000   $ 371,666,000
Liabilities:          
Other accrued liabilities 290,686,000   290,686,000   279,477,000
Deferred income taxes 485,000   485,000   345,000
Stockholders' Equity:          
Retained Earnings (Accumulated Deficit) 880,704,000   880,704,000   721,770,000
Parts, service and collision repair          
Revenues:          
Revenues 360,596,000 259,058,000 681,509,000 593,738,000  
Cost of Sales:          
Cost of Sales (184,748,000) (134,779,000) (350,612,000) (311,560,000)  
Finance, insurance and other, net          
Revenues:          
Revenues 177,254,000 $ 110,773,000 321,916,000 $ 226,064,000  
ASU 2014-09 | Finance, insurance and other, net          
Assets:          
Contract assets $ 22,000,000.0   $ 22,000,000.0   $ 21,700,000