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Financial Statement Information - Additional Information (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Finite-Lived Intangible Assets      
Reserve for estimated returns, discounts and allowances $ 34.2lkq_RevenueRecognitionReserveForSalesReturnsDiscountsAllowances   $ 31.3lkq_RevenueRecognitionReserveForSalesReturnsDiscountsAllowances
Reserve for uncollectible accounts 18.9us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent   19.4us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Amortization expense 8.3us-gaap_AmortizationOfIntangibleAssets 7.4us-gaap_AmortizationOfIntangibleAssets  
Estimated annual amortization expense in year one 32.5us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths    
Estimated annual amortization expense in year two 29.1us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo    
Estimated annual amortization expense in year three 26.7us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree    
Estimated annual amortization expense in year four 22.0us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour    
Estimated annual amortization expense in year five 17.5us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive    
Investment in unconsolidated subsidiary 13.2us-gaap_EquityMethodInvestments    
ACM Parts      
Finite-Lived Intangible Assets      
Investment in unconsolidated subsidiary 12.4us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= lkq_ACMPartsMember
   
Investment in unconsolidated subsidiary, ownership percentage 49.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= lkq_ACMPartsMember
   
Equity method investment, ownership percentage of other investors 51.00%lkq_Equitymethodinvestmentownershippercentageofotherinvestors
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= lkq_ACMPartsMember
   
Increase in equity method investment $ 7.5lkq_Lkq_additionalcontributiontoequityinvestment
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= lkq_ACMPartsMember
   
Trade names and trademarks | Minimum      
Finite-Lived Intangible Assets      
Useful life, years 10 years    
Trade names and trademarks | Maximum      
Finite-Lived Intangible Assets      
Useful life, years 30 years    
Customer relationships | Minimum      
Finite-Lived Intangible Assets      
Useful life, years 5 years    
Customer relationships | Maximum      
Finite-Lived Intangible Assets      
Useful life, years 20 years    
Software and technology related assets | Minimum      
Finite-Lived Intangible Assets      
Useful life, years 5 years    
Software and technology related assets | Maximum      
Finite-Lived Intangible Assets      
Useful life, years 6 years    
Covenants not to compete | Minimum      
Finite-Lived Intangible Assets      
Useful life, years 1 year    
Covenants not to compete | Maximum      
Finite-Lived Intangible Assets      
Useful life, years 5 years    
Salvage mechanical products      
Finite-Lived Intangible Assets      
Standard warranty period 6 months    
Remanufactured engines      
Finite-Lived Intangible Assets      
Standard warranty period 3 years