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Stock-Based Compensation - Additional Information (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award
Stock-based compensation expense	$ 5,546,000us-gaap_AllocatedShareBasedCompensationExpense	$ 6,246,000us-gaap_AllocatedShareBasedCompensationExpense
RSUs
Share-based Compensation Arrangement by Share-based Payment Award
Number of shares that RSUs convert into on the applicable vesting date	1lkq_NumberOfSharesThatRestrictedStockUnitsConvertInto / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember
Fair value of RSUs or restricted stock vested during the period	12,300,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember
RSUs granted (shares)	869,893us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember
Outstanding RSUs or restricted stock, intrinsic value	64,780,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueNonvested / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember		60,493,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueNonvested / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember
Stock-based compensation expense	5,420,000us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember	5,396,000us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember
Unrecognized Stock Based Compensation Expense Expected To Be Recognized Total	45,400,000lkq_UnrecognizedStockBasedCompensationExpenseExpectedToBeRecognizedTotal / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term	3 years 4 months 24 days
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award
Vesting period	5 years
Exercisable stock options, intrinsic value	82,134,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1 / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember
Stock-based compensation expense	126,000us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember	804,000us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember
Unrecognized Stock Based Compensation Expense Expected To Be Recognized Total	500,000lkq_UnrecognizedStockBasedCompensationExpenseExpectedToBeRecognizedTotal / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term	1 year 8 months 12 days
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award
Stock-based compensation expense	$ 0us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember	$ 46,000us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember
1998 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award
Total shares approved under the Equity Incentive Plan	869,893us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_PlanNameAxis = lkq_NineteenNinetyEightEquityIncentivePlanMember
Minimum | Stock Options
Share-based Compensation Arrangement by Share-based Payment Award
Stock options expiration period	6 years
Maximum | RSUs
Share-based Compensation Arrangement by Share-based Payment Award
Vesting period	5 years
Maximum | Stock Options
Share-based Compensation Arrangement by Share-based Payment Award
Stock options expiration period	10 years

X

- Definition

Number of shares that restricted stock units convert into on the applicable vesting date.

+ References

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- Definition

As of the balance-sheet date, the aggregate unrecognized cost of equity awards made with employees, directors and certain consultants qualifying for treatment as employees under share-based compensation plans that have yet to vest.

+ References

No definition available.

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- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

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-Publisher FASB

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- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Intrinsic value of equity-based compensation awards not vested. Excludes stock and unit options.

+ References

No definition available.

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- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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- Definition

Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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- Definition

Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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- Definition

Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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