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Financial Statement Information Impact to quarterly financial statements as result of adoption of ASU 2016-09 (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Jan. 01, 2018
Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Revenue $ 2,720,764 $ 2,342,843    
Receivables, net 1,211,788   $ 1,065,617 $ 1,027,106
Net Cash Provided by (Used in) Operating Activities 145,163 172,293    
Net Cash Provided by (Used in) Financing Activities (117,506) (326,386)    
Net income attributable to LKQ stockholders $ 152,960 $ 136,278    
Net income attributable to LKQ stockholders $ 0.49 $ 0.44    
Net income attributable to LKQ stockholders $ 0.49 $ 0.44    
Prepaid expenses and other current assets $ 180,367   178,987 134,479
Refund liability 99,179   83,019 0
Accounts payable 812,661     788,613
Other current liabilities 41,167     $ 45,727
Cost of goods sold 1,666,793 $ 1,412,750    
Selling, general and administrative expenses (1) 766,891 $ 642,817    
Adjustment Due to ASC 606 [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Receivables, net     38,511  
Prepaid expenses and other current assets     44,508  
Refund liability     $ 83,019  
Amount of adjustment to prior balance [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Revenue 2,728,712      
Receivables, net 1,165,618      
Prepaid expenses and other current assets 127,358      
Refund liability 0      
Cost of goods sold 1,674,173      
Selling, general and administrative expenses (1) 767,459      
Adjustment Due to ASC 606 [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Revenue (7,948)      
Receivables, net 46,170      
Prepaid expenses and other current assets 53,009      
Refund liability 99,179      
Cost of goods sold (7,380)      
Selling, general and administrative expenses (1) $ (568)