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 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Jan. 01, 2018
Dec. 31, 2017
Revenues:            
Revenues $ 2,505,749 $ 2,405,746 $ 4,906,523 $ 4,693,568    
Cost of Sales:            
Parts, service and collision repair (2,143,374) (2,045,128) (4,191,649) (3,982,603)    
Selling, general and administrative expenses:            
Compensation (197,641)   (382,678)      
Total segment income (loss) 50,647 42,171 70,835 78,620    
Assets:            
Receivables, net 347,847   347,847   $ 486,716 $ 482,126
Contract Assets         2,082  
Liabilities:            
Other accrued liabilities 221,180   221,180   236,677 237,963
Deferred income taxes 49,886   49,886   50,151 51,619
Stockholders’ Equity:            
Retained earnings 638,895   638,895   621,438 625,356
Contract work in process     3,300      
Parts, service and collision repair            
Revenues:            
Revenues 346,754 361,113 698,512 713,156    
Cost of Sales:            
Parts, service and collision repair (179,703) (188,043) (361,833) (370,742)    
Finance, insurance and other, net            
Revenues:            
Revenues 104,104 $ 86,908 197,829 $ 169,971    
Total revenues            
Revenues:            
Revenues 450,858   896,341      
ASU 2014-09 | Finance, insurance and other, net            
Assets:            
Contract Assets 6,000   6,000      
ASU 2014-09 | 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 | 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)  
ASU 2014-09 | Pre-ASC 606 Results            
Selling, general and administrative expenses:            
Compensation (198,045)   (383,045)      
Total segment income (loss) 48,319   67,853      
ASU 2014-09 | Pre-ASC 606 Results | Parts, service and collision repair            
Revenues:            
Revenues 349,489   700,824      
Cost of Sales:            
Parts, service and collision repair (180,994)   (362,837)      
ASU 2014-09 | Pre-ASC 606 Results | Finance, insurance and other, net            
Revenues:            
Revenues 100,737   193,906      
ASU 2014-09 | Pre-ASC 606 Results | Total revenues            
Revenues:            
Revenues 450,226   894,730      
ASU 2014-09 | Effects of Adoption of ASC 606            
Selling, general and administrative expenses:            
Compensation 404   367      
Total segment income (loss) 2,328   2,982      
ASU 2014-09 | Effects of Adoption of ASC 606 | Parts, service and collision repair            
Revenues:            
Revenues (2,735)   (2,312)      
Cost of Sales:            
Parts, service and collision repair 1,291   1,004      
ASU 2014-09 | Effects of Adoption of ASC 606 | Finance, insurance and other, net            
Revenues:            
Revenues 3,367   3,923      
ASU 2014-09 | Effects of Adoption of ASC 606 | Total revenues            
Revenues:            
Revenues $ 632   $ 1,611