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Selected Quarterly Data (unaudited) (Notes) | 12 Months Ended
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Dec. 31, 2019
Selected Quarterly Data [Abstract] |
Quarterly Financial Information [Text Block] | Selected Quarterly Data (unaudited) The following table presents unaudited selected quarterly financial data for the two years ended December 31, 2019. The operating results for any quarter are not necessarily indicative of the results for any future period.
| Quarter Ended (1)
(In thousands, except per share data) | Dec. 31 |  | Sep. 30 |  | Jun. 30 |  | Mar. 31 (2)
2019 |  |  |  |  |  |  |
Revenue | $ | 3,009,860 |  |  | $ | 3,147,773 |  |  | $ | 3,248,173 |  |  | $ | 3,100,303 |
Gross margin | 1,196,014 |  |  | 1,200,329 |  |  | 1,247,187 |  |  | 1,208,264 |
Operating income (1) | 206,768 |  |  | 231,364 |  |  | 236,111 |  |  | 222,400 |
Income from continuing operations (2) | 140,833 |  |  | 151,812 |  |  | 151,707 |  |  | 99,063 |
Net income from discontinued operations (5) (6) | 440 |  |  | 781 |  |  | 398 |  |  | — |
Net income | 141,273 |  |  | 152,593 |  |  | 152,105 |  |  | 99,063 |
Net income (loss) attributable to continuing noncontrolling interest | 479 |  |  | (46 | ) |  | 1,352 |  |  | 1,015 |
Net income attributable to discontinued noncontrolling interest | 406 |  |  | 376 |  |  | 192 |  |  | — |
Net income attributable to LKQ stockholders | 140,388 |  |  | 152,263 |  |  | 150,561 |  |  | 98,048 |
Basic earnings per share from continuing operations (7) | $ | 0.46 |  |  | $ | 0.49 |  |  | $ | 0.49 |  |  | $ | 0.31 |
Diluted earnings per share from continuing operations (7) | $ | 0.46 |  |  | $ | 0.49 |  |  | $ | 0.49 |  |  | $ | 0.31 |
| Quarter Ended (3)
(In thousands, except per share data) | Dec. 31 (2) (4) (5) |  | Sep. 30 (2) |  | Jun. 30 |  | Mar. 31
2018 |  |  |  |  |  |  |
Revenue | $ | 3,002,781 |  |  | $ | 3,122,378 |  |  | $ | 3,030,751 |  |  | $ | 2,720,764 |
Gross margin | 1,161,809 |  |  | 1,197,198 |  |  | 1,161,879 |  |  | 1,053,971 |
Operating income (4) | 164,146 |  |  | 234,733 |  |  | 256,794 |  |  | 226,568 |
Income from continuing operations (2) | 42,456 |  |  | 134,480 |  |  | 157,866 |  |  | 152,763 |
Net loss from discontinued operations (5) | (4,397 | ) |  | — |  |  | — |  |  | — |
Net income | 38,059 |  |  | 134,480 |  |  | 157,866 |  |  | 152,763 |
Net income (loss) attributable to continuing noncontrolling interest | 2,010 |  |  | 378 |  |  | 859 |  |  | (197 | )
Net income attributable to LKQ stockholders | 36,049 |  |  | 134,102 |  |  | 157,007 |  |  | 152,960 |
Basic earnings per share from continuing operations (7) | $ | 0.13 |  |  | $ | 0.42 |  |  | $ | 0.51 |  |  | $ | 0.49 |
Diluted earnings per share from continuing operations (7) | $ | 0.13 |  |  | $ | 0.42 |  |  | $ | 0.50 |  |  | $ | 0.49 |
(1) | Reflects impairment charges of $15 million, $33 million, and $2 million to net assets held for sale recorded in the first, second, and fourth quarters of 2019, respectively, and a $4 million net reversal of impairment in the third quarter of 2019. See "Net Assets Held for Sale" in Note 4, "Summary of Significant Accounting Policies," for further information.
(2) | Reflects impairment charges of $40 million in the first quarter of 2019, and charges of $48 million and $23 million in the fourth and third quarters of 2018, respectively, related to the Mekonomen equity investment. See "Investments in Unconsolidated Subsidiaries" in Note 4, "Summary of Significant Accounting Policies," for further information.
(3) The 2018 amounts presented above include the results of operations of Stahlgruber, from its acquisition effective May 30, 2018.
(4) | Reflects a $33 million goodwill impairment charge on the Aviation reporting unit recorded in the fourth quarter of 2018. See "Intangible Assets" in Note 4, "Summary of Significant Accounting Policies," for further information.
(5) | In the first quarter of 2017, LKQ completed the sale of the glass manufacturing business of its PGW subsidiary. During the fourth quarter of 2019, we incurred costs related to the disposal of the glass manufacturing business of PGW and settled certain tax matters. During the fourth quarter of 2018, we recorded a final tax expense adjustment of $4 million to the loss on sale of the glass manufacturing business of PGW. See "Glass Manufacturing Business" in Note 3, "Discontinued Operations" for further information regarding the disposal of the glass manufacturing business.
(6) | In the second quarter of 2019, we classified the acquired Stahlgruber Czech Republic wholesale business as discontinued operations. See "Czech Republic" in Note 3, "Discontinued Operations" for further information regarding the planned disposal of the Czech Republic business.
(7) The sum of the quarters may not equal the total of the respective year's earnings per share on either a basic or diluted basis due to changes in weighted average shares outstanding throughout the year.

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- Definition The entire disclosure for quarterly financial data. Includes, but is not limited to, tabular presentation of financial information for fiscal quarters, effect of year-end adjustments, and an explanation of matters or transactions that affect comparability of the information. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -URI http://asc.fasb.org/topic&trid=2126967 + Details
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