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
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Revenues:      
Parts, service and collision repair $ 351,758,000 $ 352,043,000  
Finance, insurance and other, net 93,725,000 83,063,000  
Total revenues 2,400,773,000 2,287,822,000  
Cost of Sales:      
Parts, service and collision repair (182,130,000) (182,699,000)  
Selling, general and administrative expenses:      
Operating income (loss) 20,188,000 $ 36,449,000  
Assets:      
Receivables, net 367,895,000   $ 482,126,000
Liabilities:      
Other accrued liabilities 226,530,000   237,963,000
Deferred Income Taxes 54,524,000   51,619,000
Stockholders’ Equity:      
Retained earnings 624,535,000   625,356,000
Contract work in process 4,700,000    
ASU 2014-09      
Revenues:      
Parts, service and collision repair 351,758,000    
Finance, insurance and other, net 93,725,000    
Total revenues 445,483,000    
Cost of Sales:      
Parts, service and collision repair (182,130,000)    
Selling, general and administrative expenses:      
Compensation (185,037,000)    
Operating income (loss) 20,188,000    
Assets:      
Receivables, net     486,716,000
Contract Assets     2,082,000
Liabilities:      
Other accrued liabilities     236,677,000
Deferred Income Taxes     50,151,000
Stockholders’ Equity:      
Retained earnings     621,438,000
ASU 2014-09 | F&I      
Assets:      
Contract Assets 2,600,000    
ASU 2014-09 | Previously reported      
Assets:      
Receivables, net     482,126,000
Contract Assets     0
Liabilities:      
Other accrued liabilities     237,963,000
Deferred Income Taxes     51,619,000
Stockholders’ Equity:      
Retained earnings     625,356,000
ASU 2014-09 | Effects of Adoption of ASC 606      
Assets:      
Receivables, net     4,590,000
Contract Assets     2,082,000
Liabilities:      
Other accrued liabilities     (1,286,000)
Deferred Income Taxes     (1,468,000)
Stockholders’ Equity:      
Retained earnings     $ (3,918,000)
ASU 2014-09 | Pre-ASC 606 Results      
Revenues:      
Parts, service and collision repair 351,202,000    
Finance, insurance and other, net 93,302,000    
Total revenues 444,504,000    
Cost of Sales:      
Parts, service and collision repair (181,842,000)    
Selling, general and administrative expenses:      
Compensation (185,000,000)    
Operating income (loss) 19,534,000    
ASU 2014-09 | Effects of Adoption of ASC 606      
Revenues:      
Parts, service and collision repair 556,000    
Finance, insurance and other, net 423,000    
Total revenues 979,000    
Cost of Sales:      
Parts, service and collision repair (288,000)    
Selling, general and administrative expenses:      
Compensation (37,000)    
Operating income (loss) $ 654,000