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 ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Jan. 01, 2018
Dec. 31, 2017
Revenues:            
Revenues $ 2,470,849 $ 2,505,701 $ 7,377,372 $ 7,199,269    
Cost of Sales:            
Cost of Sales (2,110,313) (2,143,079) (6,301,962) (6,125,683)    
Selling, general and administrative expenses (289,022)   (871,410)      
Operating income (loss) 48,137 55,762 118,972 134,381    
Assets:            
Receivables, net 350,912   350,912   $ 486,716 $ 482,126
Contract assets         2,082  
Liabilities:            
Other accrued liabilities 241,443   241,443   239,249 237,963
Deferred income taxes 50,449   50,449   53,087 51,619
Stockholders' Equity:            
Retained earnings 651,436   651,436   629,274 625,356
Parts, service and collision repair            
Revenues:            
Revenues 343,118 347,717 1,041,630 1,060,873    
Cost of Sales:            
Cost of Sales (176,302) (180,047) (538,135) (550,788)    
Finance, insurance and other, net            
Revenues:            
Revenues 98,061 $ 92,861 295,890 $ 262,832    
Total revenues            
Revenues:            
Revenues 441,179   1,337,520      
Pre-ASC 606 Results            
Cost of Sales:            
Selling, general and administrative expenses (288,639)   (871,394)      
Operating income (loss) 45,121   112,974      
Pre-ASC 606 Results | Parts, service and collision repair            
Revenues:            
Revenues 340,600   1,041,424      
Cost of Sales:            
Cost of Sales (175,153)   (537,990)      
Pre-ASC 606 Results | Finance, insurance and other, net            
Revenues:            
Revenues 96,031   289,937      
Pre-ASC 606 Results | Total revenues            
Revenues:            
Revenues 436,631   1,331,361      
Pre-ASC 606 Results | Previously reported            
Assets:            
Receivables, net           482,126
Contract assets           0
Liabilities:            
Other accrued liabilities           237,963
Deferred income taxes           51,619
Stockholders' Equity:            
Retained earnings           $ 625,356
ASU 2014-09 | Finance, insurance and other, net            
Assets:            
Contract assets 8,000   8,000      
ASU 2014-09 | Effects of Adoption of ASC 606            
Cost of Sales:            
Selling, general and administrative expenses (383)   (16)      
Operating income (loss) 3,016   5,998      
ASU 2014-09 | Effects of Adoption of ASC 606 | Parts, service and collision repair            
Revenues:            
Revenues 2,518   206      
Cost of Sales:            
Cost of Sales (1,149)   (145)      
ASU 2014-09 | Effects of Adoption of ASC 606 | Finance, insurance and other, net            
Revenues:            
Revenues 2,030   5,953      
ASU 2014-09 | Effects of Adoption of ASC 606 | Total revenues            
Revenues:            
Revenues $ 4,548   $ 6,159      
ASU 2014-09 | Effects of Adoption of ASC 606 | Effects of Adoption of ASC 606            
Assets:            
Receivables, net         4,590  
Contract assets         2,082  
Liabilities:            
Other accrued liabilities         1,286  
Deferred income taxes         1,468  
Stockholders' Equity:            
Retained earnings         $ 3,918