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Earnings Per Share Earnings Per Share, Basic and Diluted (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Schedule of Earnings Per Share, Basic and Diluted [Line Items]
Net income	$ 99,063	$ 152,763
Income from continuing operations	$ 99,063
Denominator for basic earnings per share—Weighted-average shares outstanding	315,046	309,517
Effect of dilutive securities:
Denominator for diluted earnings per share—Adjusted weighted-average shares outstanding	316,018	311,347
Net income attributable to LKQ stockholders	$ 0.31	$ 0.49
Net income attributable to LKQ stockholders	$ 0.31	$ 0.49
RSUs
Effect of dilutive securities:
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	414	619
Performance Based RSU [Member]
Effect of dilutive securities:
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	0	0
Stock options
Effect of dilutive securities:
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	558	1,211

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[Line Items] for Schedule of Earnings Per Share, Basic and Diluted [Table] - Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations.

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Amount after tax of income (loss) from continuing operations including portion attributable to the noncontrolling interest.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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