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Long-Term Obligations - Additional Information (Details) (USD $)
3 Months Ended 12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Mar. 27, 2014
May 09, 2013
Sep. 29, 2014
Sep. 28, 2012
Debt Instrument              
Loss on debt extinguishment $ 0us-gaap_GainsLossesOnExtinguishmentOfDebt $ (324,000)us-gaap_GainsLossesOnExtinguishmentOfDebt          
Credit Agreement              
Debt Instrument              
Maximum credit agreement borrowings       2,300,000,000lkq_MaximumCreditAgreementBorrowings
/ us-gaap_LongtermDebtTypeAxis
= lkq_CreditAgreementMember
     
Maximum increase of revolving credit facility or term loans       400,000,000lkq_IncreaseInBorrowingsTermLoanFacilitiesAndOrRevolvingCreditFacilityMaximum
/ us-gaap_LongtermDebtTypeAxis
= lkq_CreditAgreementMember
     
Maximum leverage ratio for incremental borrowings       2.50lkq_MaximumLeverageRatioforIncrementalBorrowings
/ us-gaap_LongtermDebtTypeAxis
= lkq_CreditAgreementMember
     
Term loan quarterly repayment, percentage of initial balance       1.25%lkq_TermLoanQuarterlyRepaymentPercentageofInitialBalance
/ us-gaap_LongtermDebtTypeAxis
= lkq_CreditAgreementMember
     
Increment change in applicable margin       0.25%lkq_ChangeInIncrementsInApplicableMargin
/ us-gaap_LongtermDebtTypeAxis
= lkq_CreditAgreementMember
     
Weighted average interest rate 2.38%us-gaap_DebtWeightedAverageInterestRate
/ us-gaap_LongtermDebtTypeAxis
= lkq_CreditAgreementMember
  2.10%us-gaap_DebtWeightedAverageInterestRate
/ us-gaap_LongtermDebtTypeAxis
= lkq_CreditAgreementMember
       
Increment change in commitment fees       0.05%lkq_ChangeInIncrementsInCommitmentFee
/ us-gaap_LongtermDebtTypeAxis
= lkq_CreditAgreementMember
     
Fronting fee on letters of credit in addition to participation commission       0.125%lkq_CommissionOnOutstandingLettersOfCreditAtApplicableRate
/ us-gaap_LongtermDebtTypeAxis
= lkq_CreditAgreementMember
     
Current maturities of credit agreement 22,500,000us-gaap_SecuredDebtCurrent
/ us-gaap_LongtermDebtTypeAxis
= lkq_CreditAgreementMember
  22,500,000us-gaap_SecuredDebtCurrent
/ us-gaap_LongtermDebtTypeAxis
= lkq_CreditAgreementMember
       
Outstanding letters of credit 71,500,000us-gaap_LettersOfCreditOutstandingAmount
/ us-gaap_LongtermDebtTypeAxis
= lkq_CreditAgreementMember
           
Availability on the revolving credit facility 1,200,000,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_LongtermDebtTypeAxis
= lkq_CreditAgreementMember
           
Payments of financing costs     3,700,000us-gaap_PaymentsOfFinancingCosts
/ us-gaap_LongtermDebtTypeAxis
= lkq_CreditAgreementMember
       
Fees capitalized       3,400,000us-gaap_DeferredFinanceCostsNoncurrentNet
/ us-gaap_LongtermDebtTypeAxis
= lkq_CreditAgreementMember
     
Loss on debt extinguishment     300,000us-gaap_GainsLossesOnExtinguishmentOfDebt
/ us-gaap_LongtermDebtTypeAxis
= lkq_CreditAgreementMember
       
Credit Agreement | Multicurrency Component              
Debt Instrument              
Maximum revolving credit facility borrowings       1,690,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= lkq_MulticurrencyComponentMember
/ us-gaap_LongtermDebtTypeAxis
= lkq_CreditAgreementMember
     
Credit Agreement | US Dollar Component              
Debt Instrument              
Maximum revolving credit facility borrowings       165,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= lkq_USDollarComponentMember
/ us-gaap_LongtermDebtTypeAxis
= lkq_CreditAgreementMember
     
Term Loan              
Debt Instrument              
Term loans payable 427,500,000us-gaap_SecuredDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LoansPayableMember
  433,125,000us-gaap_SecuredDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LoansPayableMember
450,000,000us-gaap_SecuredDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LoansPayableMember
     
Senior Notes              
Debt Instrument              
Senior notes 600,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
  600,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
  600,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
   
Senior notes interest rate         4.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
   
Receivables Securitization Facility              
Debt Instrument              
Weighted average interest rate 0.93%us-gaap_DebtWeightedAverageInterestRate
/ us-gaap_LongtermDebtTypeAxis
= lkq_ReceivablesSecuritizationMember
           
Receivables securitization maximum borrowing capacity           97,000,000lkq_ReceivablesSecuritizationMaximumBorrowingCapacity
/ us-gaap_LongtermDebtTypeAxis
= lkq_ReceivablesSecuritizationMember
80,000,000lkq_ReceivablesSecuritizationMaximumBorrowingCapacity
/ us-gaap_LongtermDebtTypeAxis
= lkq_ReceivablesSecuritizationMember
Receivables used as collateral for receivables securitization facility 139,900,000us-gaap_PledgedAssetsNotSeparatelyReportedFinanceReceivables
/ us-gaap_LongtermDebtTypeAxis
= lkq_ReceivablesSecuritizationMember
  129,500,000us-gaap_PledgedAssetsNotSeparatelyReportedFinanceReceivables
/ us-gaap_LongtermDebtTypeAxis
= lkq_ReceivablesSecuritizationMember
       
Borrowings under receivable securitization facility, carrying value $ 97,000,000us-gaap_TransfersAccountedForAsSecuredBorrowingsAssociatedLiabilitiesCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= lkq_ReceivablesSecuritizationMember
  $ 94,900,000us-gaap_TransfersAccountedForAsSecuredBorrowingsAssociatedLiabilitiesCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= lkq_ReceivablesSecuritizationMember