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Earnings Per Share Schedule of Earnings Per Share, Basic and Diluted (Tables) | 12 Months Ended
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Dec. 31, 2019
Schedule of Earnings Per Share, Basic and Diluted [Line Items] |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] | The following chart sets forth the computation of earnings per share (in thousands, except per share amounts):
| Year Ended December 31,
| 2019 |  | 2018 |  | 2017
Income from continuing operations | $ | 543,415 |  |  | $ | 487,565 |  |  | $ | 536,974 |
Denominator for basic earnings per share—Weighted-average shares outstanding | 310,155 |  |  | 314,428 |  |  | 308,607 |
Effect of dilutive securities: |  |  |  |  |
RSUs | 393 |  |  | 409 |  |  | 544 |
PSUs | — |  |  | — |  |  | — |
Stock options | 421 |  |  | 1,012 |  |  | 1,498 |
Denominator for diluted earnings per share—Adjusted weighted-average shares outstanding | 310,969 |  |  | 315,849 |  |  | 310,649 |
Basic earnings per share from continuing operations | $ | 1.75 |  |  | $ | 1.55 |  |  | $ | 1.74 |
Diluted earnings per share from continuing operations (1) | $ | 1.75 |  |  | $ | 1.54 |  |  | $ | 1.73 |

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- Definition [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. + References No definition available. + Details
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Namespace Prefix: | lkq_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration