LKQ (LKQ) 10-Q 2 May 19 2019 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2019	Apr. 22, 2019
Document and Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q1
Trading Symbol	LKQ
Entity Registrant Name	LKQ CORP
Entity Central Index Key	0001065696
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		313,994,156

Consolidated Statements of Inco

Consolidated Statements of Income Statement - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Income Statement [Abstract]
Revenue	$ 3,100,303	$ 2,720,764
Cost of goods sold	1,892,039	1,666,793
Gross margin	1,208,264	1,053,971
Selling, general and administrative expenses	896,532	766,891
Restructuring and acquisition related expenses	3,307	4,054
Impairment of net assets held for sale	15,023	0
Depreciation and amortization	71,002	56,458
Operating income	222,400	226,568
Other expense (income):
Interest expense, net of interest income	36,089	28,515
Other income, net	(3,851)	(2,882)
Total other expense, net	32,238	25,633
Income before provision for income taxes	190,162	200,935
Provision for income taxes	51,550	49,584
Equity in (losses) earnings of unconsolidated subsidiaries	(39,549)	1,412
Net income	99,063	152,763
Less: net income (loss) attributable to noncontrolling interest	1,015	(197)
Net income attributable to LKQ stockholders	$ 98,048	$ 152,960
Basic earnings per share: (1)
Net income	$ 0.31	$ 0.49
Less: net income (loss) attributable to noncontrolling interest	0	0
Net income attributable to LKQ stockholders	0.31	0.49
Diluted earnings per share: (1)
Net income	0.31	0.49
Less: net income (loss) attributable to noncontrolling interest	0	0
Net income attributable to LKQ stockholders	$ 0.31	$ 0.49

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 99,063	$ 152,763
Less: net income (loss) attributable to noncontrolling interest	1,015	(197)
Net income attributable to LKQ stockholders	98,048	152,960
Other comprehensive income (loss):
Foreign currency translation, net of tax	(9,895)	48,485
Net change in unrealized gains/losses on cash flow hedges, net of tax	(2,737)	3,254
Net change in unrealized gains/losses on pension plans, net of tax	191	(621)
Net change in other comprehensive loss from unconsolidated subsidiaries	(3,463)	(605)
Other comprehensive (loss) income	(15,904)	50,513
Comprehensive income	83,159	203,276
Less: comprehensive income (loss) attributable to noncontrolling interest	1,015	(197)
Comprehensive income attributable to LKQ stockholders	$ 82,144	$ 203,473

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 316,066	$ 331,761
Receivables, net	1,353,491	1,154,083
Inventories	2,692,006	2,836,075
Prepaid expenses and other current assets	283,207	199,030
Total current assets	4,644,770	4,520,949
Property, plant and equipment, net	1,206,342	1,220,162
Operating lease assets, net	1,279,576	0
Intangible assets:
Goodwill	4,354,306	4,381,458
Other intangibles, net	889,609	928,752
Equity method investments	134,234	179,169
Other assets	157,073	162,912
Total assets	12,665,910	11,393,402
Current liabilities:
Accounts payable	952,688	942,398
Accrued expenses:
Accrued payroll-related liabilities	143,026	172,005
Other accrued expenses	317,826	288,425
Refund liability	105,435	104,585
Other current liabilities	100,058	61,109
Current portion of operating lease liabilities	216,172	0
Current portion of long-term obligations	136,283	121,826
Total current liabilities	1,971,488	1,690,348
Long-term operating lease liabilities, excluding current portion	1,109,814	0
Long-term obligations, excluding current portion	4,092,766	4,188,674
Deferred income taxes	305,770	311,434
Other noncurrent liabilities	329,298	364,194
Commitments and contingencies
Stockholders’ equity:
Common stock, $0.01 par value, 1,000,000,000 shares authorized, 318,888,569 shares issued and 313,973,538 shares outstanding at March 31, 2019; 318,417,821 shares issued and 316,146,114 shares outstanding at December 31, 2018	3,189	3,184
Additional paid-in capital	1,420,685	1,415,188
Retained earnings	3,696,924	3,598,876
Accumulated other comprehensive loss	(190,854)	(174,950)
Treasury stock, at cost; 4,915,031 shares at March 31, 2019 and 2,271,707 shares at December 31, 2018	(130,462)	(60,000)
Total Company stockholders' equity	4,799,482	4,782,298
Noncontrolling interest	57,292	56,454
Total stockholders' equity	4,856,774	4,838,752
Total liabilities and stockholders’ equity	$ 12,665,910	$ 11,393,402

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - $ / shares	Mar. 31, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	1,000,000,000	1,000,000,000
Common stock, shares issued	318,888,569	318,417,821
Common stock, shares outstanding	313,973,538	316,146,114
Treasury Stock, Common, Shares	4,915,031	2,271,707

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 99,063	$ 152,763
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	76,207	61,066
Impairment of Mekonomen equity method investment	39,551	0
Impairment of net assets held for sale	15,023	0
Stock-based compensation expense	5,673	5,982
Other	(310)	(3,134)
Changes in operating assets and liabilities, net of effects from acquisitions and dispositions:
Receivables, net	(205,029)	(130,520)
Inventories	71,811	5,016
Prepaid income taxes/income taxes payable	42,917	37,362
Accounts payable	23,291	23,924
Other operating assets and liabilities	9,028	(7,296)
Net cash provided by operating activities	177,225	145,163
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property, plant and equipment	(53,016)	(62,189)
Acquisitions, net of cash acquired	(4,785)	(2,966)
Other investing activities, net	17	534
Net cash used in investing activities	(57,784)	(64,621)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from exercise of stock options	1,334	2,255
Taxes paid related to net share settlements of stock-based compensation awards	(1,505)	(3,292)
Purchase of treasury stock	(70,462)	0
Borrowings under revolving credit facilities	284,641	201,669
Repayments under revolving credit facilities	(312,339)	(321,525)
Repayments under term loans	(2,188)	(4,405)
Borrowings under receivables securitization facility	6,600	0
Repayments under receivables securitization facility	(36,910)	0
(Repayments) borrowings of other debt, net	(625)	4,409
Other financing activities, net	1,277	(3,383)
Net cash used in financing activities	(132,731)	(117,506)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	(2,513)	2,877
Net decrease in cash, cash equivalents and restricted cash	(15,803)	(34,087)
Cash, cash equivalents and restricted cash, beginning of period	337,250	279,766
Reconciliation of cash, cash equivalents and restricted cash
Cash and Cash Equivalents	316,066	245,679
Restricted cash included in Other assets	5,381	0
Cash, cash equivalents and restricted cash, end of period	321,447	245,679
Supplemental disclosure of cash paid for:
Income taxes, net of refunds	11,775	15,464
Interest	14,462	13,975
Supplemental disclosure of noncash investing and financing activities:
Noncash property, plant and equipment additions	9,054	4,199
Other financing obligations, including debt assumed in connection with business acquisitions	8,424	0
Contingent consideration liabilities	$ 0	$ 34

Consolidated Statements of Stoc

Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Treasury Stock, Common [Member]	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Noncontrolling Interest
March 31, 2019 at Dec. 31, 2017		309,127
March 31, 2019 at Dec. 31, 2017	$ 4,206,653	$ 3,091		$ 1,141,451	$ 3,124,103	$ (70,476)	$ 8,484
Net income	152,763
Other comprehensive loss	50,513					50,513
Vesting of restricted stock units, net of shares withheld for employee tax		300
Vesting of restricted stock units, net of shares withheld for employee tax	(2,396)	$ 3		(2,399)
Stock-based compensation expense	5,982			5,982
Exercise of stock options		226
Exercise of stock options	2,255	$ 2		2,253
March 31, 2019 at Mar. 31, 2018		309,631
March 31, 2019 at Mar. 31, 2018	4,418,981	$ 3,096		1,146,391	3,271,718	(14,618)	12,394
Net income attributable to LKQ stockholders	152,960				152,960
Tax withholdings related to net share settlements of stock-based compensation awards		(22)
Shares withheld for net share settlement of stock option awards	(896)			(896)
Adoption of ASU 2018-02 (see Note 8)	5,345				(5,345)	5,345
Proceeds from Contributed Capital	4,107						4,107
Net Income (Loss) Attributable to Noncontrolling Interest	197						(197)
March 31, 2019 at Dec. 31, 2017		309,127
March 31, 2019 at Dec. 31, 2017	4,206,653	$ 3,091		1,141,451	3,124,103	(70,476)	8,484
March 31, 2019 at Dec. 31, 2018		318,418
March 31, 2019 at Dec. 31, 2018	4,838,752	$ 3,184	$ (60,000)	1,415,188	3,598,876	(174,950)	56,454
Stock issued in acquisitions	251,334
Acquired noncontrolling interest	44,110
Treasury Stock, Shares			(2,272)
Net income	99,063
Other comprehensive loss	(15,904)					(15,904)
Vesting of restricted stock units, net of shares withheld for employee tax		303
Vesting of restricted stock units, net of shares withheld for employee tax	(1,077)	$ 3		(1,080)
Stock-based compensation expense	5,673			5,673
Exercise of stock options		183
Exercise of stock options	1,334	$ 2		1,332
March 31, 2019 at Mar. 31, 2019		318,889
March 31, 2019 at Mar. 31, 2019	4,856,774	$ 3,189	$ (130,462)	1,420,685	3,696,924	$ (190,854)	57,292
Net income attributable to LKQ stockholders	98,048				$ 98,048
Treasury Stock, Shares, Acquired			(2,643)
Treasury Stock, Value, Acquired, Cost Method	(70,462)		$ (70,462)
Tax withholdings related to net share settlements of stock-based compensation awards		(15)
Shares withheld for net share settlement of stock option awards	(428)	$ 0		$ (428)
Proceeds from Contributed Capital	(177)						(177)
Net Income (Loss) Attributable to Noncontrolling Interest	$ (1,015)						$ (1,015)
Treasury Stock, Shares			(4,915)

Interim Financial Statements

Interim Financial Statements	3 Months Ended
	Mar. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Business	Interim Financial Statements The accompanying unaudited condensed consolidated financial statements represent the consolidation of LKQ Corporation, a Delaware corporation, and its subsidiaries. LKQ Corporation is a holding company and all operations are conducted by subsidiaries. When the terms "LKQ," "the Company," "we," "us," or "our" are used in this document, those terms refer to LKQ Corporation and its consolidated subsidiaries. We have prepared the accompanying unaudited condensed consolidated financial statements pursuant to the rules and regulations of the Securities and Exchange Commission ("SEC") applicable to interim financial statements. Accordingly, certain information related to our significant accounting policies and footnote disclosures normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States of America ("GAAP") have been condensed or omitted. These unaudited condensed consolidated financial statements reflect, in the opinion of management, all material adjustments (which include only normally recurring adjustments) necessary to fairly state, in all material respects, our financial position, results of operations and cash flows for the periods presented. Operating results for interim periods are not necessarily indicative of the results that can be expected for any subsequent interim period or for a full year. These interim financial statements should be read in conjunction with our audited consolidated financial statements and notes thereto included in our Annual Report on Form 10-K for the year ended December 31, 2018 filed with the SEC on March 1, 2019 ("2018 Form 10-K").

Business Combinations (Notes)

Business Combinations (Notes)	3 Months Ended
	Mar. 31, 2019
Business Combinations [Abstract]
Business Combinations	Business Combinations During the three months ended March 31, 2019 , we completed two acquisitions of wholesale businesses in Europe. These acquisitions were not material to our results of operations or financial position as of and for the three months ended March 31, 2019 . Total acquisition date fair value of the consideration for these acquisitions was $7 million , of which $5 million was cash paid (net of cash acquired). In addition, we assumed $7 million of existing debt as of the acquisition dates. On May 30, 2018 , we acquired Stahlgruber GmbH ("Stahlgruber"), a leading European wholesale distributor of aftermarket spare parts for passenger cars, tools, capital equipment and accessories with operations in Germany, Austria, Italy, Slovenia, and Croatia, with further sales to Switzerland. Total acquisition date fair value of the consideration for our Stahlgruber acquisition was € 1.2 billion ($ 1.4 billion ), composed of € 1.0 billion ($ 1.1 billion ) of cash paid (net of cash acquired), and € 215 million ($ 251 million ) of newly issued shares of LKQ common stock. We financed the acquisition with the proceeds from €1.0 billion ( $1.2 billion ) of senior notes, the direct issuance to Stahlgruber's owner of 8,055,569 newly issued shares of LKQ common stock, and borrowings under our existing revolving credit facility. We recorded $913 million ( $908 million in 2018 and $5 million of adjustments in the three months ended March 31, 2019) of goodwill related to our acquisition of Stahlgruber. On May 3, 2018, the European Commission cleared the acquisition for the entire European Union, except with respect to the wholesale automotive parts business in the Czech Republic. The acquisition of the Czech Republic wholesale business has been referred to the Czech Republic competition authority for review. The Czech Republic wholesale business represents an immaterial portion of Stahlgruber's revenue and profitability. In addition to our acquisition of Stahlgruber, during the year ended December 31, 2018, we completed acquisitions of four wholesale businesses in North America and nine wholesale businesses in Europe. Total acquisition date fair value of the consideration for these acquisitions was $ 99 million , composed of $ 85 million of cash paid (net of cash and restricted cash acquired), $11 million of notes payable, and $3 million for the estimated value of contingent payments to former owners (with maximum potential payments totaling $5 million ). During the year ended December 31, 2018 , we recorded $68 million of goodwill related to these acquisitions. Our acquisitions are accounted for under the purchase method of accounting and are included in our consolidated financial statements from the dates of acquisition. The purchase prices were allocated to the net assets acquired based upon estimated fair values at the dates of acquisition. The purchase price allocations for the acquisitions made during the three months ended March 31, 2019 and the last nine months of the year ended December 31, 2018 are preliminary as we are in the process of determining the following: 1) valuation amounts for certain receivables, inventories and fixed assets acquired; 2) valuation amounts for certain intangible assets acquired; 3) the acquisition date fair value of certain liabilities assumed; and 4) the tax basis of the entities acquired. We have recorded preliminary estimates for certain of the items noted above and will record adjustments, if any, to the preliminary amounts upon finalization of the valuations. During the first quarter of 2019, the measurement period adjustments recorded for acquisitions completed in prior periods were not material. The income statement effect of these measurement period adjustments that would have been recorded in previous reporting periods if the adjustments had been recognized as of the acquisition dates was immaterial. The purchase price allocations for the acquisitions completed during the year ended December 31, 2018 are as follows (in thousands): Year Ended December 31, 2018 Stahlgruber Other Acquisitions (1) Total Receivables $ 144,826 $ 19,171 $ 163,997 Receivable reserves (2,818 ) (918 ) (3,736 ) Inventories 380,238 14,021 394,259 Prepaid expenses and other current assets 10,970 1,851 12,821 Property , plant and equipment 271,292 5,711 277,003 Goodwill 908,253 64,637 972,890 Other intangibles 285,255 35,159 320,414 Other assets 16,625 37 16,662 Deferred income taxes (78,130 ) (5,285 ) (83,415 ) Current liabilities assumed (346,788 ) (20,116 ) (366,904 ) Debt assumed (79,925 ) (4,875 ) (84,800 ) Other noncurrent liabilities assumed (2) (80,824 ) (10,306 ) (91,130 ) Noncontrolling interest (44,110 ) — (44,110 ) Contingent consideration liabilities — (3,107 ) (3,107 ) Other purchase price obligations (6,084 ) 3,623 (2,461 ) Stock issued (251,334 ) — (251,334 ) Notes issued — (11,347 ) (11,347 ) Gains on bargain purchases (3) — (2,418 ) (2,418 ) Settlement of other purchase price obligations (non-interest bearing) — 1,711 1,711 Cash used in acquisitions, net of cash and restricted cash acquired $ 1,127,446 $ 87,549 $ 1,214,995 (1) The amounts recorded during the year ended December 31, 2018 include a $5 million adjustment to increase other intangibles related to our acquisition of Warn Industries, Inc. ("Warn") in 2017 and $4 million of adjustments to reduce other purchase price obligations related to other 2017 acquisitions. (2) The amount recorded for our acquisition of Stahlgruber includes a $79 million liability for certain pension obligations. (3) The amounts recorded during the year ended December 31, 2018 are due to the gains on bargain purchases related to (i) an acquisition in Europe completed in the second quarter of 2017 as a result of changes in the acquisition date fair value of the consideration, and (ii) three acquisitions in Europe completed during 2018 as a result of changes to our estimates of the fair values of the net assets acquired. The fair value of our intangible assets is based on a number of inputs, including projections of future cash flows, discount rates, assumed royalty rates and customer attrition rates, all of which are Level 3 inputs. We used the relief-from-royalty method to value trade names, trademarks, software and other technology assets, and we used the multi-period excess earnings method to value customer relationships. The relief-from-royalty method assumes that the intangible asset has value to the extent that its owner is relieved of the obligation to pay royalties for the benefits received from the intangible asset. The multi-period excess earnings method is based on the present value of the incremental after-tax cash flows attributable only to the customer relationship after deducting contributory asset charges. The fair value of our property, plant and equipment is determined using inputs such as market comparables and current replacement or reproduction costs of the asset, adjusted for physical, functional and economic factors; these adjustments to arrive at fair value use unobservable inputs in which little or no market data exists, and therefore, these inputs are considered to be Level 3 inputs. See Note 11, "Fair Value Measurements " for further information regarding the tiers in the fair value hierarchy. The acquisition of Stahlgruber expanded LKQ's geographic presence in continental Europe and serves as an additional strategic hub for our European operations. In addition, the acquisition of Stahlgruber allows for continued improvement in procurement, logistics and infrastructure optimization. The primary objectives of our other acquisitions made during the three months ended March 31, 2019 and the year ended December 31, 2018 were to create economic value for our stockholders by enhancing our position as a leading source for alternative collision and mechanical repair products and to expand into other product lines and businesses that may benefit from our operating strengths. When we identify potential acquisitions, we attempt to target companies with a leading market presence, an experienced management team and workforce that provides a fit with our existing operations, and strong cash flows. For certain of our acquisitions, we have identified cost savings and synergies as a result of integrating the company with our existing business that provide additional value to the combined entity. In many cases, acquiring companies with these characteristics will result in purchase prices that include a significant amount of goodwill. The following pro forma summary presents the effect of the businesses acquired during the three months ended March 31, 2019 as though the businesses had been acquired as of January 1, 2018, and the businesses acquired during the year ended December 31, 2018 as though they had been acquired as of January 1, 2017. The pro forma adjustments are based upon unaudited financial information of the acquired entities (in thousands, except per share data): Three Months Ended March 31, 2019 2018 Revenue, as reported $ 3,100,303 $ 2,720,764 Revenue of purchased businesses for the period prior to acquisition: Stahlgruber — 489,534 Other acquisitions 5,980 43,005 Pro forma revenue $ 3,106,283 $ 3,253,303 Net income, as reported $ 99,063 $ 152,763 Net income of purchased businesses for the period prior to acquisition, and pro forma purchase accounting adjustments: Stahlgruber 3,074 1,273 Other acquisitions 330 334 Acquisition related expenses, net of tax (1) 224 1,526 Pro forma net income 102,691 155,896 Less: Net income (loss) attributable to noncontrolling interest, as reported 1,015 (197 ) Less: Pro forma net income attributable to noncontrolling interest — 528 Pro forma net income attributable to LKQ stockholders $ 101,676 $ 155,565 (1) Includes expenses related to acquisitions closed in the period and excludes expenses for acquisitions not yet completed. Unaudited pro forma supplemental information is based upon accounting estimates and judgments that we believe are reasonable. The unaudited pro forma supplemental information includes the effect of purchase accounting adjustments, such as the adjustment of inventory acquired to fair value, adjustments to depreciation on acquired property, plant and equipment, adjustments to rent expense for above or below market leases, adjustments to amortization on acquired intangible assets, adjustments to interest expense, and the related tax effects. The pro forma impact of our acquisitions also reflects the elimination of acquisition related expenses, net of tax. Refer to Note 5, "Restructuring and Acquisition Related Expenses ," for further information regarding our acquisition related expenses. These pro forma results are not necessarily indicative of what would have occurred if the acquisitions had been in effect for the periods presented or of future results.

Financial Statement Information

Financial Statement Information	3 Months Ended
	Mar. 31, 2019
Accounting Policies [Abstract]
Inventory	Inventories Inventories consist of the following (in thousands): March 31, December 31, 2019 2018 Aftermarket and refurbished products $ 2,229,681 $ 2,309,458 Salvage and remanufactured products 437,463 503,199 Manufactured products 24,862 23,418 Total inventories (1) $ 2,692,006 $ 2,836,075 (1) During the first quarter of 2019, $62 million of inventory was classified as held for sale. Refer to the "Net Assets Held for Sale" section for further information. Aftermarket and refurbished products and salvage and remanufactured products are primarily composed of finished goods. As of March 31, 2019 , manufactured products inventory was composed of $17 million of raw materials, $2 million of work in process, and $6 million of finished goods. As of December 31, 2018 , manufactured products inventory was composed of $17 million of raw materials, $2 million of work in process, and $4 million of finished goods.
Receivables, Policy [Policy Text Block]	Allowance for Doubtful Accounts We have a reserve for uncollectible accounts, which was approximately $55 million and $57 million at March 31, 2019 and December 31, 2018 , respectively.
Summary of Significant Accounting Policies	Financial Statement Information Allowance for Doubtful Accounts We have a reserve for uncollectible accounts, which was approximately $55 million and $57 million at March 31, 2019 and December 31, 2018 , respectively. Inventories Inventories consist of the following (in thousands): March 31, December 31, 2019 2018 Aftermarket and refurbished products $ 2,229,681 $ 2,309,458 Salvage and remanufactured products 437,463 503,199 Manufactured products 24,862 23,418 Total inventories (1) $ 2,692,006 $ 2,836,075 (1) During the first quarter of 2019, $62 million of inventory was classified as held for sale. Refer to the "Net Assets Held for Sale" section for further information. Aftermarket and refurbished products and salvage and remanufactured products are primarily composed of finished goods. As of March 31, 2019 , manufactured products inventory was composed of $17 million of raw materials, $2 million of work in process, and $6 million of finished goods. As of December 31, 2018 , manufactured products inventory was composed of $17 million of raw materials, $2 million of work in process, and $4 million of finished goods. Net Assets Held for Sale During the first quarter of 2019, we committed to plans to sell certain businesses in our North America and Europe segments. As a result, these businesses were classified as net assets held for sale and were required to be adjusted to the lower of fair value less cost to sell or carrying value, resulting in total impairment charges of $15 million , which were recorded within Impairment of net assets held for sale in the Unaudited Condensed Consolidated Statement of Income. As of March 31, 2019, there were $88 million of assets held for sale, including $5 million of goodwill that was reclassified as held for sale related to our Europe segment, and $8 million of liabilities held for sale, which are recorded within Prepaid expenses and other current assets and Other current liabilities, respectively, on the Unaudited Condensed Consolidated Balance Sheet. We expect these businesses to be disposed of during the next twelve months. The businesses do not meet the requirements to be considered discontinued operations. These businesses generated annualized revenue of approximately $170 million during the twelve-month period ended March 31, 2019. We are required to record net assets of our held for sale businesses at the lower of fair value less cost to sell or carrying value. Fair values were based on projected discounted cash flows and/or estimated selling prices. Management's assumptions for our discounted cash flow analysis of the businesses were based on projecting revenues and profits, tax rates, capital expenditures, working capital requirements and discount rates. For businesses for which we utilized estimated selling prices to calculate the fair value, factors included projected market multiples and any legitimate offers. Due to the uncertainties in the estimation process, it is possible that actual results could differ from the estimates used in the Company's historical analysis. The inputs utilized in the fair value estimates are classified as Level 3 within the fair value hierarchy. The fair values of the net assets were measured on a non-recurring basis as of March 31, 2019. Investments in Unconsolidated Subsidiaries Our investment in unconsolidated subsidiaries was $134 million and $179 million as of March 31, 2019 and December 31, 2018 , respectively. On December 1, 2016 , we acquired a 26.5% equity interest in Mekonomen AB ("Mekonomen") for an aggregate purchase price of $181 million . In October 2018, we acquired an additional $48 million of equity in Mekonomen at a discounted share price as part of its rights issue, increasing our equity interest to 26.6% . We are accounting for our interest in Mekonomen using the equity method of accounting, as our investment gives us the ability to exercise significant influence, but not control, over the investee. As of March 31, 2019, our share of the book value of Mekonomen's net assets exceeded the book value of our investment in Mekonomen by $5 million ; this difference is primarily related to Mekonomen's Accumulated Other Comprehensive Income balance as of our acquisition date in 2016. We are recording our equity in the net earnings of Mekonomen on a one quarter lag. We recorded an equity loss of $40 million during the three months ended March 31, 2019, compared to equity in earnings of $2 million during the three months ended March 31, 2018 related to our investment in Mekonomen, including adjustments to convert the results to GAAP and to recognize the impact of our purchase accounting adjustments and the other-than-temporary impairment (three months ended March 31, 2019 only) described below. In May 2018, we received a cash dividend of $8 million (SEK 67 million ) related to our investment in Mekonomen. Mekonomen announced in February 2019 that the Mekonomen Board of Directors has proposed no dividend payment in 2019. We evaluated our investment in Mekonomen for other-than-temporary impairment as of March 31, 2019, and concluded the decline in fair value was other-than-temporary due to a significant stock price decrease since December 31, 2018, the last date at which we recognized an other-than-temporary impairment charge related to our investment. Therefore, we recognized an other-than-temporary impairment of $40 million , which represented the difference in the carrying value and the fair value of our investment in Mekonomen. The fair value of our investment in Mekonomen was determined using the Mekonomen share price of SEK 65 as of March 31, 2019. The impairment charge is recorded in Equity in (losses) earnings of unconsolidated subsidiaries on our Unaudited Condensed Consolidated Statements of Income. Equity in losses and earnings from our investment in Mekonomen are reported in the Europe segment. As a result of the impairment charge, the Level 1 fair value of our equity investment in the publicly traded Mekonomen common stock at March 31, 2019 approximated the carrying value of $110 million . Warranty Reserve Some of our salvage mechanical products are sold with a standard six month warranty against defects. Additionally, some of our remanufactured engines are sold with a standard three year warranty against defects. We also provide a limited lifetime warranty for certain of our aftermarket products. These assurance-type warranties are not considered a separate performance obligation, and thus no transaction price is allocated to them. We record the warranty costs in Cost of goods sold on our Unaudited Condensed Consolidated Statements of Income. Our warranty reserve is calculated using historical claim information to project future warranty claims activity and is recorded within Other accrued expenses and Other noncurrent liabilities on our Unaudited Condensed Consolidated Balance Sheets based on the expected timing of the related payments. The changes in the warranty reserve are as follows (in thousands): Balance as of December 31, 2018 $ 23,262 Warranty expense 14,202 Warranty claims (12,499 ) Balance as of March 31, 2019 $ 24,965 Litigation and Related Contingencies We have certain contingencies resulting from litigation, claims and other commitments and are subject to a variety of environmental and pollution control laws and regulations incident to the ordinary course of business. We currently expect that the resolution of such contingencies will not materially affect our financial position, results of operations or cash flows. Treasury Stock On October 25, 2018, our Board of Directors authorized a stock repurchase program under which we may purchase up to $500 million of our common stock from time to time through October 25, 2021. Repurchases under the program may be made in the open market or in privately negotiated transactions, with the amount and timing of repurchases depending on market conditions and corporate needs. The repurchase program does not obligate us to acquire any specific number of shares and may be suspended or discontinued at any time. Delaware law imposes restrictions on stock repurchases. During the three months ended March 31, 2019, we repurchased 2.6 million shares of common stock for an aggregate price of $70 million . During 2018, we repurchased 2.3 million shares of common stock for an aggregate price of $60 million . As of March 31, 2019, there is $370 million of remaining capacity under our repurchase program. Repurchased shares are accounted for as treasury stock using the cost method. Recent Accounting Pronouncements Adoption of New Lease Standard In February 2016, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update 2016-02, "Leases" ("ASU 2016-02"), which represents the FASB Accounting Standard Codification Topic 842 ("ASC 842"), to increase transparency and comparability by recognizing lease assets and lease liabilities on the Unaudited Condensed Consolidated Balance Sheets and disclosing key information about leasing arrangements. The main difference between the prior standard and ASU 2016-02 is the recognition of lease assets and lease liabilities by lessees for those leases classified as operating leases under the prior standard. We adopted the standard in the first quarter of 2019 using the modified retrospective approach and took advantage of the transition package of practical expedients permitted within the new standard, which, among other things, allows us to carryforward the historical lease classification. For leases with a term of 12 months or less, we elected the short-term lease exemption, which allowed us to not recognize right-of-use assets or lease liabilities for qualifying leases existing at transition and new leases we may enter into in the future. Additionally, we adopted the practical expedient to combine lease and non-lease components. As of January 1, 2019, we recorded both an operating lease asset and operating lease liability of $1.3 billion . The preexisting deferred rent liability balances from the historical straight-line treatment of operating leases was reclassified as a reduction of the lease asset upon adoption. The adoption of the standard did not materially affect our Unaudited Condensed Consolidated Statements of Income or Statements of Cash Flows as operating lease payments will still be an operating cash outflow and capital lease payments will still be a financing cash outflow. The new standard did not have a material impact on our liquidity. The standard will have no impact on our debt covenant compliance under our current agreements as the covenant calculations are based on the prior lease accounting rules. Other Recently Adopted Accounting Pronouncements During the first quarter of 2019, we adopted ASU No. 2017-12, "Targeted Improvements to Accounting for Hedging Activities" ("ASU 2017-12"), which amends the hedge accounting recognition and presentation requirements in ASC 815 ("Derivatives and Hedging"). ASU 2017-12 significantly alters the hedge accounting model by making it easier for an entity to achieve and maintain hedge accounting and provides for accounting that better reflects an entity's risk management activities. We adopted the provisions of ASU 2017-12 by applying a modified retrospective approach to existing hedging relationships as of the adoption date. The adoption of ASU 2017-12 did not have a material impact on our unaudited condensed consolidated financial statements. Recently Issued Accounting Pronouncements In August 2018, the FASB issued ASU No. 2018-13, "Disclosure Framework- Changes to the Disclosure Requirements for Fair Value Measurement" ("ASU 2018-13"), which removes, modifies, and adds certain disclosure requirements in ASC 820. ASU 2018-13 is effective for fiscal years and interim periods beginning after December 15, 2019; early adoption is permitted. We are in the process of evaluating the impact of this standard on our disclosures but do not believe that it will have a material impact. In June 2016, the FASB issued ASU 2016-13, "Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments" ("ASU 2016-13"), and in November 2018 issued a subsequent amendment, ASU 2018-19, "Codification Improvements to Topic 326, Financial Instruments - Credit Losses" ("ASU 2018-19"). ASU 2016-13 significantly changes how entities will measure credit losses for most financial assets and certain other instruments that are not measured at fair value through net income. ASU 2016-13 will replace today’s “incurred loss” approach with an “expected loss” model for instruments measured at amortized cost. ASU 2018-19 will affect loans, debt securities, trade receivables, net investments in leases, off balance sheet credit exposures, reinsurance receivables, and any other financial assets not excluded from the scope of this amendment that represent the contractual right to receive cash. ASU 2016-13 and ASU 2018-19 should be applied on either a prospective transition or modified-retrospective approach depending on the subtopic. ASU 2016-13 is effective for annual periods beginning after December 15, 2019, and interim periods therein. Early adoption is permitted for annual periods beginning after December 15, 2018, and interim periods therein. We are currently evaluating the impact of the adoption of this standard on our consolidated financial statements.
Recent Accounting Pronouncements	Recent Accounting Pronouncements Adoption of New Lease Standard In February 2016, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update 2016-02, "Leases" ("ASU 2016-02"), which represents the FASB Accounting Standard Codification Topic 842 ("ASC 842"), to increase transparency and comparability by recognizing lease assets and lease liabilities on the Unaudited Condensed Consolidated Balance Sheets and disclosing key information about leasing arrangements. The main difference between the prior standard and ASU 2016-02 is the recognition of lease assets and lease liabilities by lessees for those leases classified as operating leases under the prior standard. We adopted the standard in the first quarter of 2019 using the modified retrospective approach and took advantage of the transition package of practical expedients permitted within the new standard, which, among other things, allows us to carryforward the historical lease classification. For leases with a term of 12 months or less, we elected the short-term lease exemption, which allowed us to not recognize right-of-use assets or lease liabilities for qualifying leases existing at transition and new leases we may enter into in the future. Additionally, we adopted the practical expedient to combine lease and non-lease components. As of January 1, 2019, we recorded both an operating lease asset and operating lease liability of $1.3 billion . The preexisting deferred rent liability balances from the historical straight-line treatment of operating leases was reclassified as a reduction of the lease asset upon adoption. The adoption of the standard did not materially affect our Unaudited Condensed Consolidated Statements of Income or Statements of Cash Flows as operating lease payments will still be an operating cash outflow and capital lease payments will still be a financing cash outflow. The new standard did not have a material impact on our liquidity. The standard will have no impact on our debt covenant compliance under our current agreements as the covenant calculations are based on the prior lease accounting rules. Other Recently Adopted Accounting Pronouncements During the first quarter of 2019, we adopted ASU No. 2017-12, "Targeted Improvements to Accounting for Hedging Activities" ("ASU 2017-12"), which amends the hedge accounting recognition and presentation requirements in ASC 815 ("Derivatives and Hedging"). ASU 2017-12 significantly alters the hedge accounting model by making it easier for an entity to achieve and maintain hedge accounting and provides for accounting that better reflects an entity's risk management activities. We adopted the provisions of ASU 2017-12 by applying a modified retrospective approach to existing hedging relationships as of the adoption date. The adoption of ASU 2017-12 did not have a material impact on our unaudited condensed consolidated financial statements. Recently Issued Accounting Pronouncements In August 2018, the FASB issued ASU No. 2018-13, "Disclosure Framework- Changes to the Disclosure Requirements for Fair Value Measurement" ("ASU 2018-13"), which removes, modifies, and adds certain disclosure requirements in ASC 820. ASU 2018-13 is effective for fiscal years and interim periods beginning after December 15, 2019; early adoption is permitted. We are in the process of evaluating the impact of this standard on our disclosures but do not believe that it will have a material impact. In June 2016, the FASB issued ASU 2016-13, "Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments" ("ASU 2016-13"), and in November 2018 issued a subsequent amendment, ASU 2018-19, "Codification Improvements to Topic 326, Financial Instruments - Credit Losses" ("ASU 2018-19"). ASU 2016-13 significantly changes how entities will measure credit losses for most financial assets and certain other instruments that are not measured at fair value through net income. ASU 2016-13 will replace today’s “incurred loss” approach with an “expected loss” model for instruments measured at amortized cost. ASU 2018-19 will affect loans, debt securities, trade receivables, net investments in leases, off balance sheet credit exposures, reinsurance receivables, and any other financial assets not excluded from the scope of this amendment that represent the contractual right to receive cash. ASU 2016-13 and ASU 2018-19 should be applied on either a prospective transition or modified-retrospective approach depending on the subtopic. ASU 2016-13 is effective for annual periods beginning after December 15, 2019, and interim periods therein. Early adoption is permitted for annual periods beginning after December 15, 2018, and interim periods therein. We are currently evaluating the impact of the adoption of this standard on our consolidated financial statements.

Revenue Recognition Revenue Rec

Revenue Recognition Revenue Reconition (Notes)	3 Months Ended
	Mar. 31, 2019
Revenue Recognition [Abstract]
Revenue From Contract With Customer	Revenue Recognition The majority of our revenue is derived from the sale of vehicle parts. We recognize revenue when the products are shipped to, delivered to or picked up by customers, which is the point when title has transferred and risk of ownership has passed. Sources of Revenue We report our revenue in two categories: (i) parts and services and (ii) other. The following table sets forth our revenue by category, with our parts and services revenue further disaggregated by reportable segment (in thousands): Three Months Ended March 31, 2019 2018 North America $ 1,155,698 $ 1,172,585 Europe 1,440,841 1,037,046 Specialty 352,556 350,674 Parts and services 2,949,095 2,560,305 Other 151,208 160,459 Total revenue $ 3,100,303 $ 2,720,764 Parts and Services Our parts revenue is generated from the sale of vehicle products including replacement parts, components and systems used in the repair and maintenance of vehicles and specialty products and accessories to improve the performance, functionality and appearance of vehicles. Services revenue includes additional services that are generally billed concurrently with the related product sales, such as the sale of service-type warranties and fees for admission to our self service yards. In North America, our vehicle replacement products include sheet metal collision parts such as doors, hoods, and fenders; bumper covers; head and tail lamps; automotive glass products such as windshields; mirrors and grilles; wheels; and large mechanical items such as engines and transmissions. In Europe, our products include a wide variety of small mechanical products such as brake pads, discs and sensors; clutches; electrical products such as spark plugs and batteries; steering and suspension products; filters; and oil and automotive fluids. In our Specialty operations, we serve six product segments: truck and off-road; speed and performance; RV; towing; wheels, tires and performance handling; and miscellaneous accessories. Our service-type warranties typically have service periods ranging from 6 months to 36 months . Under ASC 606, proceeds from these service-type warranties are deferred at contract inception and amortized on a straight-line basis to revenue over the contract period. The changes in deferred service-type warranty revenue are as follows (in thousands): Balance as of January 1, 2019 $ 24,006 Additional warranty revenue deferred 10,875 Warranty revenue recognized (9,370 ) Balance as of March 31, 2019 $ 25,511 Other Revenue Revenue from other sources includes scrap sales, bulk sales to mechanical manufacturers (including cores) and sales of aluminum ingots and sows from our furnace operations. We derive scrap metal from several sources, including vehicles that have been used in both our wholesale and self service recycling operations and from original equipment manufacturers ("OEMs") and other entities that contract with us for secure disposal of "crush only" vehicles. The sale of hulks in our wholesale and self service recycling operations represents one performance obligation, and revenue is recognized based on a price per weight when the customer (processor) collects the scrap. Some adjustments may occur when the customer weighs the scrap at their location, and revenue is adjusted accordingly. Revenue by Geographic Area See Note 15, "Segment and Geographic Information " for information related to our revenue by geographic region. Variable Consideration The amount of revenue ultimately received from the customer can vary due to variable consideration which includes returns, discounts, rebates, refunds, credits, price concessions, incentives, performance bonuses, or other similar items. The previous revenue guidance required us to estimate the transaction price using a best estimate approach. Under ASC 606 we are required to select the “expected value method” or the “most likely amount” method in order to estimate variable consideration. We utilize both methods in practice depending on the type of variable consideration, with contemplation of any expected reversals in revenue. As of both March 31, 2019 and December 31, 2018 , we recorded a refund liability and return asset for expected returns of $105 million and $56 million , respectively. The refund liability is presented separately on the balance sheet within current liabilities while the return asset is presented within prepaid expenses and other current assets. Other types of variable consideration consist primarily of discounts, volume rebates, and other customer sales incentives which are recorded in Receivables, net on the Unaudited Condensed Consolidated Balance Sheets. We recorded a reserve for our variable consideration of $66 million and $103 million as of March 31, 2019 and December 31, 2018 , respectively. While other customer incentive programs exist, we characterize them as material rights in the context of our sales transactions. We consider these programs to be immaterial to our unaudited condensed consolidated financial statements.

Restructuring and Acquisition R

Restructuring and Acquisition Related Expenses (Notes)	3 Months Ended
	Mar. 31, 2019
Restructuring and Related Activities [Abstract]
Restructuring and Acquisition Related Expenses	Restructuring and Acquisition Related Expenses Acquisition Related Expenses Acquisition related expenses, which include external costs such as legal, accounting and advisory fees, were immaterial for the three months ended March 31, 2019 , and were $2 million for the three months ended March 31, 2018 . Acquisition related expenses for the three months ended March 31, 2019 consisted of external costs related to completed acquisitions and pending acquisitions as of March 31, 2019 . Acquisition related expenses for the three months ended March 31, 2018 included $1 million of costs related to our acquisition of Stahlgruber. The remaining acquisition related costs for the three months ended March 31, 2018 consisted of external costs related to (i) other completed acquisitions, (ii) acquisitions that were pending as of March 31, 2018, and (iii) potential acquisitions that were terminated. Acquisition Integration Plans and Restructuring During the three months ended March 31, 2019 and 2018, we incurred $3 million and $2 million of restructuring expenses, respectively. Restructuring expenses incurred during each of the three months ended March 31, 2019 and 2018 included $2 million related to the integration of our acquisition of Andrew Page Limited ("Andrew Page"). We expect to incur additional expenses related to the integration of certain of our acquisitions into our existing operations. These integration activities are expected to include the closure of duplicate facilities, rationalization of personnel in connection with the consolidation of overlapping facilities with our existing business, and moving expenses. Future expenses to complete these integration plans are expected to be approximately $20 million .

Equity Incentive Plans

Equity Incentive Plans	3 Months Ended
	Mar. 31, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Equity Incentive Plans	Stock-Based Compensation In order to attract and retain employees, non-employee directors, consultants, and other persons associated with us, we may grant qualified and nonqualified stock options, stock appreciation rights, restricted stock, restricted stock units (“RSUs”), performance shares and performance units under the LKQ Corporation 1998 Equity Incentive Plan (the “Equity Incentive Plan”). We have granted RSUs, stock options, and restricted stock under the Equity Incentive Plan. We expect to issue new or treasury shares of common stock to cover past and future equity grants. RSUs The RSUs we have issued vest over periods of up to five years, subject to a continued service condition. Currently outstanding RSUs (other than PSUs, which are described below) contain either a time-based vesting condition or a combination of a performance-based vesting condition and a time-based vesting condition, in which case both conditions must be met before any RSUs vest. For most of the RSUs containing a performance-based vesting condition, the Company must report positive diluted earnings per share, subject to certain adjustments, during any fiscal year period within five years following the grant date; we have an immaterial amount of RSUs containing other performance-based vesting conditions. Each RSU converts into one share of LKQ common stock on the applicable vesting date. The grant date fair value of RSUs is based on the market price of LKQ stock on the grant date. Our 2019 annual grant of RSUs occurred on March 1, 2019; in previous years, the annual grant occurred in mid-January. Starting with our 2019 grants, participants who are eligible for retirement (defined as a voluntary separation of service from the Company after the participant has attained at least 60 years of age and completed at least five years of service) will continue to vest in their awards; if retirement occurs during the first year of the vesting period (for RSUs subject to a time-based vesting condition) or the first year of the performance period (for RSUs with a performance-based vesting condition), the participant vests in a prorated amount of the RSU grant based on the portion of the year employed. For our RSU grants in 2018 and prior, participants forfeit their unvested shares upon retirement. The fair value of RSUs that vested during the three months ended March 31, 2019 was $9 million ; the fair value of RSUs vested is based on the market price of LKQ stock on the date vested. The following table summarizes activity related to our RSUs under the Equity Incentive Plan for the three months ended March 31, 2019 : Number Outstanding Weighted Average Grant Date Fair Value Weighted Average Remaining Contractual Term (in years) Aggregate Intrinsic Value (in thousands) (1) Unvested as of January 1, 2019 1,475,682 $ 34.94 Granted 832,974 $ 27.69 Vested (343,552 ) $ 33.47 Forfeited / Canceled (15,499 ) $ 34.01 Unvested as of March 31, 2019 1,949,605 $ 32.11 Expected to vest after March 31, 2019 1,737,948 $ 32.12 3.1 $ 49,323 (1) The aggregate intrinsic value of expected to vest RSUs represents the total pretax intrinsic value (the fair value of the Company's stock on the last day of each period multiplied by the number of units) that would have been received by the holders had all RSUs vested. This amount changes based on the market price of the Company’s common stock. On March 1, 2019, we granted performance-based three -year RSUs ("PSUs") to certain employees, including our executive officers, as part of our cash incentive plan ("CIP"). As these awards are performance-based, the exact number of shares to be paid out may be up to twice the grant amount, depending on the Company's performance and the achievement of certain performance metrics (adjusted earnings per share, average organic parts and services revenue growth, and average return on invested capital) over the three year period ending December 31, 2021. The following table summarizes activity related to our PSUs under the Equity Incentive Plan for the three months ended March 31, 2019 : Number Outstanding Weighted Average Grant Date Fair Value Weighted Average Remaining Contractual Term (in years) Aggregate Intrinsic Value (in thousands) (1) Unvested as of January 1, 2019 — $ — Granted (2) 116,094 $ 27.69 Unvested as of March 31, 2019 116,094 $ 27.69 Expected to vest after March 31, 2019 116,094 $ 27.69 2.8 $ 3,295 (1) The aggregate intrinsic value of expected to vest PSUs represents the total pretax intrinsic value (the fair value of the Company's stock on the last day of each period multiplied by the number of units at target) that would have been received by the holders had all PSUs vested. This amount changes based on the market price of the Company’s common stock and the achievement of the performance metrics relative to the established targets. (2) Represents the number of PSUs at target payout. Stock Options Stock options vest over periods of up to five years, subject to a continued service condition. Stock options expire either six or ten years from the date they are granted. No options were granted during the three months ended March 31, 2019 . No options vested during the three months ended March 31, 2019 ; all of our outstanding options are fully vested. The following table summarizes activity related to our stock options under the Equity Incentive Plan for the three months ended March 31, 2019 : Number Outstanding Weighted Average Exercise Price Weighted Average Remaining Contractual Term (in years) Aggregate Intrinsic Value (in thousands) (1) Balance as of January 1, 2019 1,051,494 $ 10.15 Exercised (182,541 ) $ 7.31 $ 3,274 Canceled (6,528 ) $ 15.21 Balance as of March 31, 2019 862,425 $ 10.72 0.7 $ 15,362 Exercisable as of March 31, 2019 862,425 $ 10.72 0.7 $ 15,362 (1) The aggregate intrinsic value of outstanding and exercisable options represents the total pretax intrinsic value (the difference between the fair value of the Company's stock on the last day of each period and the exercise price, multiplied by the number of options where the fair value exceeds the exercise price) that would have been received by the option holders had all option holders exercised their options as of the last day of the period indicated. This amount changes based on the market price of the Company’s common stock. Stock-Based Compensation Expense Pre-tax stock-based compensation expense for RSUs and PSUs totaled $6 million for each of the three months ended March 31, 2019 and 2018. As of March 31, 2019 , unrecognized compensation expense related to unvested RSUs and PSUs was $55 million . Stock-based compensation expense related to these awards will be different to the extent that forfeitures ar e realized and performance under the PSUs differs from target.

Earnings Per Share Earnings Per

Earnings Per Share Earnings Per Share (Notes)	3 Months Ended
	Mar. 31, 2019
Earnings Per Share [Abstract]
Earnings Per Share [Text Block]	Earnings Per Share The following chart sets forth the computation of earnings per share (in thousands, except per share amounts): Three Months Ended March 31, 2019 2018 Net income $ 99,063 $ 152,763 Denominator for basic earnings per share—Weighted-average shares outstanding 315,046 309,517 Effect of dilutive securities: RSUs 414 619 PSUs — — Stock options 558 1,211 Denominator for diluted earnings per share—Adjusted weighted-average shares outstanding 316,018 311,347 Earnings per share, basic $ 0.31 $ 0.49 Earnings per share, diluted $ 0.31 $ 0.49 The following table sets forth the number of employee stock-based compensation awards outstanding but not included in the computation of diluted earnings per share because their effect would have been antidilutive for the three months ended March 31, 2019 and 2018 (in thousands): Three Months Ended March 31, 2019 2018 Antidilutive securities: RSUs 599 — Stock options 32 —

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income (Loss)	3 Months Ended
	Mar. 31, 2019
Equity [Abstract]
Accumulated Other Comprehensive Income (Loss)	Accumulated Other Comprehensive Income (Loss) The components of Accumulated Other Comprehensive Income (Loss) are as follows (in thousands): Three Months Ended March 31, 2019 Foreign Unrealized Gain (Loss) Unrealized (Loss) Gain Other Comprehensive Loss from Unconsolidated Subsidiaries Accumulated Beginning balance $ (177,597 ) $ 14,374 $ (8,075 ) $ (3,652 ) $ (174,950 ) Pretax (loss) income (9,895 ) 15,593 — — 5,698 Income tax effect — (3,654 ) — — (3,654 ) Reclassification of unrealized (gain) loss — (19,188 ) 253 — (18,935 ) Reclassification of deferred income taxes — 4,512 (62 ) — 4,450 Other comprehensive loss from unconsolidated subsidiaries — — — (3,463 ) (3,463 ) Ending balance $ (187,492 ) $ 11,637 $ (7,884 ) $ (7,115 ) $ (190,854 ) Three Months Ended March 31, 2018 Foreign Unrealized Gain (Loss) Unrealized (Loss) Gain Other Comprehensive Loss from Unconsolidated Subsidiaries Accumulated Beginning balance $ (71,933 ) $ 11,538 $ (8,772 ) $ (1,309 ) $ (70,476 ) Pretax income (loss) 48,435 (4,501 ) (629 ) — 43,305 Income tax effect 50 1,053 8 — 1,111 Reclassification of unrealized loss — 8,747 — — 8,747 Reclassification of deferred income taxes — (2,045 ) — — (2,045 ) Other comprehensive loss from unconsolidated subsidiaries — — — (605 ) (605 ) Adoption of ASU 2018-02 2,859 2,486 — — 5,345 Ending balance $ (20,589 ) $ 17,278 $ (9,393 ) $ (1,914 ) $ (14,618 ) Net unrealized gains on our interest rate swaps, inclusive of our interest rate swap agreements and the interest rate swap component of our cross currency swaps, totaling $2 million were reclassified to Interest expense, net of interest income in our Unaudited Condensed Consolidated Statements of Income during each of the three months ended March 31, 2019 and 2018 . We also reclassified gains of $4 million and $1 million to Interest expense, net of interest income related to the foreign currency forward component of our cross currency swaps during the three months ended March 31, 2019 and 2018 , respectively. Also related to our cross currency swaps, we reclassified gains of $13 million and losses of $12 million to Other income, net in our Unaudited Condensed Consolidated Statements of Income during the three months ended March 31, 2019 and 2018 , respectively; these gains and losses offset the impact of the remeasurement of the underlying contracts. Net unrealized losses related to our pension plans were reclassified to Other income, net in our Unaudited Condensed Consolidated Statements of Income during the three months ended March 31, 2019. Our policy is to reclassify the income tax effect from Accumulated other comprehensive income (loss) to the Provision for income taxes when the related gains and losses are released to the Unaudited Condensed Consolidated Statements of Income. During the first quarter of 2018, we adopted ASU No. 2018-02, "Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income" ("ASU 2018-02"), which allowed a reclassification from Accumulated other comprehensive income (loss) to Retained earnings for stranded tax effects resulting from the reduction of the U.S. federal statutory income tax rate to 21% from 35% due to the enactment of the Tax Cuts and Jobs Act of 2017 (the "Tax Act"). As a result of the adoption of ASU 2018-02 in the first quarter of 2018, we recorded a $5 million reclassification to increase Accumulated other comprehensive income (loss) and decrease Retained earnings. The components of Accumulated Other Comprehensive Income (Loss) are as follows (in thousands): Three Months Ended March 31, 2019 Foreign Unrealized Gain (Loss) Unrealized (Loss) Gain Other Comprehensive Loss from Unconsolidated Subsidiaries Accumulated Beginning balance $ (177,597 ) $ 14,374 $ (8,075 ) $ (3,652 ) $ (174,950 ) Pretax (loss) income (9,895 ) 15,593 — — 5,698 Income tax effect — (3,654 ) — — (3,654 ) Reclassification of unrealized (gain) loss — (19,188 ) 253 — (18,935 ) Reclassification of deferred income taxes — 4,512 (62 ) — 4,450 Other comprehensive loss from unconsolidated subsidiaries — — — (3,463 ) (3,463 ) Ending balance $ (187,492 ) $ 11,637 $ (7,884 ) $ (7,115 ) $ (190,854 ) Three Months Ended March 31, 2018 Foreign Unrealized Gain (Loss) Unrealized (Loss) Gain Other Comprehensive Loss from Unconsolidated Subsidiaries Accumulated Beginning balance $ (71,933 ) $ 11,538 $ (8,772 ) $ (1,309 ) $ (70,476 ) Pretax income (loss) 48,435 (4,501 ) (629 ) — 43,305 Income tax effect 50 1,053 8 — 1,111 Reclassification of unrealized loss — 8,747 — — 8,747 Reclassification of deferred income taxes — (2,045 ) — — (2,045 ) Other comprehensive loss from unconsolidated subsidiaries — — — (605 ) (605 ) Adoption of ASU 2018-02 2,859 2,486 — — 5,345 Ending balance $ (20,589 ) $ 17,278 $ (9,393 ) $ (1,914 ) $ (14,618 )

Long-Term Obligations

Long-Term Obligations	3 Months Ended
	Mar. 31, 2019
Debt Disclosure [Abstract]
Long-Term Obligations	Long-Term Obligations Long-term obligations consist of the following (in thousands): March 31, December 31, 2019 2018 Senior secured credit agreement: Term loans payable $ 347,813 $ 350,000 Revolving credit facilities 1,363,544 1,387,177 U.S. Notes (2023) 600,000 600,000 Euro Notes (2024) 560,900 573,350 Euro Notes (2026/28) 1,121,800 1,146,700 Receivables securitization facility 79,690 110,000 Notes payable through October 2030 at weighted average interest rates of 2.1% and 2.0%, respectively 21,701 23,056 Finance lease obligations 42,160 39,966 Other long-term debt at weighted average interest rate of 1.9% and 1.8%, respectively 126,540 117,448 Total debt 4,264,148 4,347,697 Less: long-term debt issuance costs (34,810 ) (36,906 ) Less: current debt issuance costs (289 ) (291 ) Total debt, net of debt issuance costs 4,229,049 4,310,500 Less: current maturities, net of debt issuance costs (136,283 ) (121,826 ) Long term debt, net of debt issuance costs $ 4,092,766 $ 4,188,674 Senior Secured Credit Agreement On November 20, 2018, LKQ Corporation, LKQ Delaware LLP, and certain other subsidiaries (collectively, the "Borrowers") entered into Amendment No. 3 to the Fourth Amended and Restated Credit Agreement ("Credit Agreement"), which amended the Fourth Amended and Restated Credit Agreement dated January 29, 2016 by modifying certain terms to (1) increase the total availability under the revolving credit facility's multicurrency component from $2.75 billion to $3.15 billion ; (2) reduce the margin on borrowings by 25 basis points at the September 30, 2018 leverage ratio, and reduce the number of leverage pricing tiers; (3) extend the maturity date by one year to January 29, 2024; (4) reduce the unused facility fee depending on leverage category; (5) increase the capacity for incurring additional indebtedness under our receivables securitization facility; (6) increase the maximum borrowing limit of swingline loans and add the ability to borrow in British Pounds and Euros; and (7) make other immaterial or clarifying modifications and amendments to the terms of the Credit Agreement. Borrowings will continue to bear interest at variable rates. Amounts under the revolving credit facility are due and payable upon maturity of the Credit Agreement on January 29, 2024. Term loan borrowings, which totaled $348 million as of March 31, 2019 , are due and payable in quarterly installments equal to $2 million on the last day of each of the first four fiscal quarters ending on or after March 31, 2019 and approximately $4 million on the last day of each fiscal quarter thereafter, with the remaining balance due and payable on January 29, 2024. The increase in the revolving credit facility's multicurrency component of $400 million was used in part to pay down $240 million of the term loan (to the new $350 million amount that was outstanding as of the date of the amendment); the remainder will be used for general corporate purposes. We are required to prepay the term loan by amounts equal to proceeds from the sale or disposition of certain assets if the proceeds are not reinvested within twelve months. We also have the option to prepay outstanding amounts under the Credit Agreement without penalty. The Credit Agreement contains customary representations and warranties and customary covenants that provide limitations and conditions on our ability to enter into certain transactions. The Credit Agreement also contains financial and affirmative covenants, including limitations on our net leverage ratio and a minimum interest coverage ratio. Borrowings under the Credit Agreement bear interest at variable rates, which depend on the currency and duration of the borrowing elected, plus an applicable margin. The applicable margin is subject to change in increments of 0.25% depending on our net leverage ratio. Interest payments are due on the last day of the selected interest period or quarterly in arrears depending on the type of borrowing. Including the effect of the interest rate swap agreements described in Note 10, "Derivative Instruments and Hedging Activities ," the weighted average interest rates on borrowings outstanding under the Credit Agreement at March 31, 2019 and December 31, 2018 were 1.8% and 1.9% , respectively. We also pay a commitment fee based on the average daily unused amount of the revolving credit facilities. The commitment fee is subject to change in increments of 0.05% depending on our net leverage ratio. In addition, we pay a participation commission on outstanding letters of credit at an applicable rate based on our net leverage ratio, and a fronting fee of 0.125% to the issuing bank, which are due quarterly in arrears. Of the total borrowings outstanding under the Credit Agreement, there were $11 million classified as current maturities at March 31, 2019 compared to $9 million at December 31, 2018 . As of March 31, 2019 , there were letters of credit outstanding in the aggregate amount of $65 million . The amounts available under the revolving credit facilities are reduced by the amounts outstanding under letters of credit, and thus availability under the revolving credit facilities at March 31, 2019 was $1.7 billion . Related to the execution of Amendment No. 3 to the Fourth Amended and Restated Credit Agreement in November 2018, we incurred $4 million of fees, the majority of which were capitalized as an offset to Long-Term Obligations and are amortized over the term of the agreement. U.S. Notes (2023) In 2013, we issued $600 million aggregate principal amount of 4.75% senior notes due 2023 (the "U.S. Notes (2023)"). The U.S. Notes (2023) are governed by the Indenture dated as of May 9, 2013 (the "U.S. Notes (2023) Indenture") among LKQ Corporation, certain of our subsidiaries (the "Guarantors"), the trustee, paying agent, transfer agent and registrar. The U.S. Notes (2023) are registered under the Securities Act of 1933. The U.S. Notes (2023) bear interest at a rate of 4.75% per year from the most recent payment date on which interest has been paid or provided for. Interest on the U.S. Notes (2023) is payable in arrears on May 15 and November 15 of each year. The U.S. Notes (2023) are fully and unconditionally guaranteed, jointly and severally, by the Guarantors. The U.S. Notes (2023) and the related guarantees are, respectively, LKQ Corporation's and each Guarantor's senior unsecured obligations and are subordinated to all of the Guarantors' existing and future secured debt to the extent of the assets securing that secured debt. In addition, the U.S. Notes (2023) are effectively subordinated to all of the liabilities of our subsidiaries that are not guaranteeing the U.S. Notes (2023) to the extent of the assets of those subsidiaries. Euro Notes (2024) On April 14, 2016, LKQ Italia Bondco S.p.A. (“LKQ Italia”), an indirect, wholly-owned subsidiary of LKQ Corporation, completed an offering of €500 million aggregate principal amount of senior notes due April 1, 2024 (the “Euro Notes (2024)”) in a private placement conducted pursuant to Regulation S and Rule 144A under the Securities Act of 1933. The proceeds from the offering were used to repay a portion of the revolver borrowings under the Credit Agreement and to pay related fees and expenses. The Euro Notes (2024) are governed by the Indenture dated as of April 14, 2016 (the “Euro Notes (2024) Indenture”) among LKQ Italia, LKQ Corporation and certain of our subsidiaries (the “Euro Notes (2024) Subsidiaries”), the trustee, and the paying agent, transfer agent, and registrar. The Euro Notes (2024) bear interest at a rate of 3.875% per year from the date of original issuance or from the most recent payment date on which interest has been paid or provided for. Interest on the Euro Notes (2024) is payable in arrears on April 1 and October 1 of each year. The Euro Notes (2024) are fully and unconditionally guaranteed by LKQ Corporation and the Euro Notes (2024) Subsidiaries (the "Euro Notes (2024) Guarantors"). The Euro Notes (2024) and the related guarantees are, respectively, LKQ Italia’s and each Euro Notes (2024) Guarantor’s senior unsecured obligations and are subordinated to all of LKQ Italia's and the Euro Notes (2024) Guarantors’ existing and future secured debt to the extent of the assets securing that secured debt. In addition, the Euro Notes (2024) are effectively subordinated to all of the liabilities of our subsidiaries that are not guaranteeing the Euro Notes (2024) to the extent of the assets of those subsidiaries. The Euro Notes (2024) have been listed on the ExtraMOT, Professional Segment of the Borsa Italia S.p.A. securities exchange and the Global Exchange Market of Euronext Dublin. Euro Notes (2026/28) On April 9, 2018, LKQ European Holdings B.V. ("LKQ Euro Holdings"), a wholly-owned subsidiary of LKQ Corporation, completed an offering of €1.0 billion aggregate principal amount of senior notes. The offering consisted of €750 million senior notes due 2026 (the "2026 notes") and €250 million senior notes due 2028 (the "2028 notes" and, together with the 2026 notes, the "Euro Notes (2026/28)") in a private placement conducted pursuant to Regulation S and Rule 144A under the Securities Act of 1933. The proceeds from the offering, together with borrowings under our senior secured credit facility, were or will be used to (i) finance a portion of the consideration paid for the Stahlgruber acquisition, (ii) for general corporate purposes and (iii) to pay related fees and expenses, including the refinancing of net financial debt. The Euro Notes (2026/28) are governed by the Indenture dated as of April 9, 2018 (the “Euro Notes (2026/28) Indenture”) among LKQ Euro Holdings, LKQ Corporation and certain of our subsidiaries (the “Euro Notes (2026/28) Subsidiaries”), the trustee, paying agent, transfer agent, and registrar. The 2026 notes and 2028 notes bear interest at a rate of 3.625% and 4.125% , respectively, per year from the date of original issuance or from the most recent payment date on which interest has been paid or provided for. Interest on the Euro Notes (2026/28) is payable in arrears on April 1 and October 1 of each year, beginning on October 1, 2018. The Euro Notes (2026/28) are fully and unconditionally guaranteed by LKQ Corporation and the Euro Notes (2026/28) Subsidiaries (the "Euro Notes (2026/28) Guarantors"). The Euro Notes (2026/28) and the related guarantees are, respectively, LKQ Euro Holdings' and each Euro Notes (2026/28) Guarantor’s senior unsecured obligations and will be subordinated to all of LKQ Euro Holdings' and the Euro Notes (2026/28) Guarantors’ existing and future secured debt to the extent of the assets securing that secured debt. In addition, the Euro Notes (2026/28) are effectively subordinated to all of the liabilities of our subsidiaries that are not guaranteeing the Euro Notes (2026/28) to the extent of the assets of those subsidiaries. The Euro Notes (2026/28) have been listed on the Global Exchange Market of Euronext Dublin. Related to the execution of the Euro Notes (2026/28) in April 2018, we incurred $16 million of fees, which were capitalized as an offset to Long-Term Obligations and are amortized over the term of the Euro Notes (2026/28). Receivables Securitization Facility On December 20, 2018, we amended the terms of our receivables securitization facility with MUFG Bank, Ltd. ("MUFG") (formerly known as The Bank of Tokyo-Mitsubishi UFJ, Ltd.) to: (i) extend the term of the facility to November 8, 2021; (ii) increase the maximum amount available to $110 million ; and (iii) make other clarifying and updating changes. Under the facility, LKQ sells an ownership interest in certain receivables, related collections and security interests to MUFG for the benefit of conduit investors and/or financial institutions for cash proceeds. Upon payment of the receivables by customers, rather than remitting to MUFG the amounts collected, LKQ retains such collections as proceeds for the sale of new receivables generated by certain of the ongoing operations of the Company. The sale of the ownership interest in the receivables is accounted for as a secured borrowing in our Unaudited Condensed Consolidated Balance Sheets, under which the receivables included in the program collateralize the amounts invested by MUFG, the conduit investors and/or financial institutions (the "Purchasers"). The receivables are held by LKQ Receivables Finance Company, LLC ("LRFC"), a wholly owned bankruptcy-remote special purpose subsidiary of LKQ, and therefore, the receivables are available first to satisfy the creditors of LRFC, including the Purchasers. Net receivables totaling $142 million and $132 million were collateral for the investment under the receivables facility as of March 31, 2019 and December 31, 2018, respectively. Under the receivables facility, we pay variable interest rates plus a margin on the outstanding amounts invested by the Purchasers. The variable rates are based on (i) commercial paper rates, (ii) London Interbank Offered Rate ("LIBOR"), or (iii) base rates, and are payable monthly in arrears. The commercial paper rate is the applicable variable rate unless conduit investors are not available to invest in the receivables at commercial paper rates. In such case, financial institutions will invest at the LIBOR rate or at base rates. We also pay a commitment fee on the excess of the investment maximum over the average daily outstanding investment, payable monthly in arrears. As of March 31, 2019 , the interest rate under the receivables facility was based on commercial paper rates and was 3.4% . The outstanding balances of $80 million and $110 million as of March 31, 2019 and December 31, 2018, respectively, were classified as long-term on the Unaudited Condensed Consolidated Balance Sheets because we have the ability and intent to refinance these borrowings on a long-term basis.

Derivative Instruments and Hedg

Derivative Instruments and Hedging Activities (Notes)	3 Months Ended
	Mar. 31, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments and Hedging Activities Disclosure [Text Block]	Derivative Instruments and Hedging Activities We are exposed to market risks, including the effect of changes in interest rates, foreign currency exchange rates and commodity prices. Under our current policies, we use derivatives to manage our exposure to variable interest rates on our senior secured debt and changing foreign exchange rates for certain foreign currency denominated transactions. We do not hold or issue derivatives for trading purposes. Cash Flow Hedges We hold interest rate swap agreements to hedge a portion of the variable interest rate risk on our variable rate borrowings under our Credit Agreement, with the objective of minimizing the impact of interest rate fluctuations and stabilizing cash flows. Under the terms of the interest rate swap agreements, we pay the fixed interest rate and receive payment at a variable rate of interest based on LIBOR for the respective currency of each interest rate swap agreement’s notional amount. Changes in the fair value of the interest rate swap agreements are recorded in Accumulated Other Comprehensive Income (Loss) and are reclassified to interest expense when the underlying interest payment has an impact on earnings. Our interest rate swap contracts have maturity dates ranging from January to June 2021. In December 2018, we sold two interest rate swap contracts with a notional amount of $110 million . From time to time, we may hold foreign currency forward contracts related to certain foreign currency denominated intercompany transactions, with the objective of minimizing the impact of fluctuating exchange rates on these future cash flows. Under the terms of the foreign currency forward contracts, we will sell the foreign currency in exchange for U.S. dollars at a fixed rate on the maturity dates of the contracts. Changes in the fair value of the foreign currency forward contracts are recorded in Accumulated Other Comprehensive Income (Loss) and reclassified to other income, net when the underlying transaction has an impact on earnings. In 2016, we entered into three cross currency swap agreements for a total notional amount of $422 million ( €400 million ). The notional amount steps down by €15 million annually through 2020 with the remainder maturing in January 2021. These cross currency swaps contain an interest rate swap component and a foreign currency forward contract component that, combined with related intercompany financing arrangements, effectively convert variable rate U.S. dollar-denominated borrowings into fixed rate euro-denominated borrowings. The swaps are intended to minimize the impact of fluctuating exchange rates and interest rates on the cash flows resulting from the related intercompany financing arrangements. The changes in the fair value of the derivative instruments are recorded in Accumulated Other Comprehensive Income (Loss) and are reclassified to interest expense, net of interest income when the underlying transactions have an impact on earnings. In October 2018, we entered into two cross currency swap agreements for a total notional amount of $184 million ( €160 million ). Half of the notional amount matures in October 2019 with the remainder in October 2020. The purpose and accounting of the swaps are similar to those described in the previous paragraph. The activity related to our cash flow hedges is presented in operating activities in our Unaudited Condensed Consolidated Statements of Cash Flows. The following tables summarize the notional amounts and fair values of our designated cash flow hedges as of March 31, 2019 and December 31, 2018 (in thousands): Notional Amount Fair Value at March 31, 2019 (USD) March 31, 2019 Other Current Assets Other Assets Other Accrued Expenses Other Noncurrent Liabilities Interest rate swap agreements USD denominated $ 480,000 $ — $ 11,350 $ — $ — Cross currency swap agreements USD/euro $ 570,349 2,242 7,669 144 29,442 Total cash flow hedges $ 2,242 $ 19,019 $ 144 $ 29,442 Notional Amount Fair Value at December 31, 2018 (USD) December 31, 2018 Other Current Assets Other Assets Other Accrued Expenses Other Noncurrent Liabilities Interest rate swap agreements USD denominated $ 480,000 $ — $ 14,967 $ — $ — Cross currency swap agreements USD/euro $ 574,315 211 7,669 127 40,870 Total cash flow hedges $ 211 $ 22,636 $ 127 $ 40,870 While certain derivative instruments executed with the same counterparty are subject to master netting arrangements, we present our cash flow hedge derivative instruments on a gross basis in our Unaudited Condensed Consolidated Balance Sheets. The impact of netting the fair values of these contracts would result in a decrease to Other Assets and Other Noncurrent Liabilities on our Unaudited Condensed Consolidated Balance Sheets of $12 million and $14 million at March 31, 2019 and December 31, 2018 , respectively. The activity related to our cash flow hedges is included in Note 8, "Accumulated Other Comprehensive Income (Loss) ." As of March 31, 2019 , we estimate that $4 million of derivative gains (net of tax) included in Accumulated Other Comprehensive Income (Loss) will be reclassified into our Unaudited Condensed Consolidated Statements of Income within the next 12 months. Other Derivative Instruments We hold other short-term derivative instruments, including foreign currency forward contracts, to manage our exposure to variability related to inventory purchases and intercompany financing transactions denominated in a non-functional currency. We have elected not to apply hedge accounting for these transactions, and therefore the contracts are adjusted to fair value through our results of operations as of each balance sheet date, which could result in volatility in our earnings. The notional amount and fair value of these contracts at March 31, 2019 and December 31, 2018 , along with the effect on our results of operations during the three months ended March 31, 2019 and 2018 , were immaterial.

Fair Value Measurements (Notes)

Fair Value Measurements (Notes)	3 Months Ended
	Mar. 31, 2019
Fair Value Disclosures [Abstract]
Fair Value Disclosures [Text Block]	Fair Value Measurements Financial Assets and Liabilities Measured at Fair Value We use the market and income approaches to estimate the fair value of our financial assets and liabilities, and during the three months ended March 31, 2019 , there were no significant changes in valuation techniques or inputs related to the financial assets or liabilities that we have historically recorded at fair value. The tiers in the fair value hierarchy include: Level 1, defined as observable inputs such as quoted market prices in active markets; Level 2, defined as inputs other than quoted prices in active markets that are either directly or indirectly observable; and Level 3, defined as significant unobservable inputs in which little or no market data exists, therefore requiring an entity to develop its own assumptions. The following tables present information about our financial assets and liabilities measured at fair value on a recurring basis and indicate the fair value hierarchy of the valuation inputs we utilized to determine such fair value as of March 31, 2019 and December 31, 2018 (in thousands): Balance as of March 31, 2019 Fair Value Measurements as of March 31, 2019 Level 1 Level 2 Level 3 Assets: Cash surrender value of life insurance $ 53,316 $ — $ 53,316 $ — Interest rate swaps 11,350 — 11,350 — Cross currency swap agreements 9,911 — 9,911 — Total Assets $ 74,577 $ — $ 74,577 $ — Liabilities: Contingent consideration liabilities $ 5,274 $ — $ — $ 5,274 Deferred compensation liabilities 56,493 — 56,493 — Cross currency swap agreements 29,586 — 29,586 — Total Liabilities $ 91,353 $ — $ 86,079 $ 5,274 Balance as of December 31, 2018 Fair Value Measurements as of December 31, 2018 Level 1 Level 2 Level 3 Assets: Cash surrender value of life insurance $ 47,649 $ — $ 47,649 $ — Interest rate swaps 14,967 — 14,967 — Cross currency swap agreements 7,880 — 7,880 — Total Assets $ 70,496 $ — $ 70,496 $ — Liabilities: Contingent consideration liabilities $ 5,209 $ — $ — $ 5,209 Deferred compensation liabilities 48,984 — 48,984 — Cross currency swap agreements 40,997 — 40,997 — Total Liabilities $ 95,190 $ — $ 89,981 $ 5,209 The cash surrender value of life insurance is included in Other assets on our Unaudited Condensed Consolidated Balance Sheets. The current portion of deferred compensation is included in Accrued payroll-related liabilities and the current portion of contingent consideration liabilities is included in Other current liabilities on our Unaudited Condensed Consolidated Balance Sheets; the noncurrent portion of these amounts is included in Other noncurrent liabilities on our Unaudited Condensed Consolidated Balance Sheets based on the expected timing of the related payments. The balance sheet classification of the interest rate swaps and cross currency swap agreements is presented in Note 10, "Derivative Instruments and Hedging Activities ." Our Level 2 assets and liabilities are valued using inputs from third parties and market observable data. We obtain valuation data for the cash surrender value of life insurance and deferred compensation liabilities from third party sources, which determine the net asset values for our accounts using quoted market prices, investment allocations and reportable trades. We value our other derivative instruments using a third party valuation model that performs a discounted cash flow analysis based on the terms of the contracts and market observable inputs such as current and forward interest rates and current and forward foreign exchange rates. Our contingent consideration liabilities are related to our business acquisitions. Under the terms of the contingent consideration agreements, payments may be made at specified future dates depending on the performance of the acquired business subsequent to the acquisition. The liabilities for these payments are classified as Level 3 liabilities because the related fair value measurement, which is determined using an income approach, includes significant inputs not observable in the market. Financial Assets and Liabilities Not Measured at Fair Value Our debt is reflected on the Unaudited Condensed Consolidated Balance Sheets at cost. Based on market conditions as of both March 31, 2019 and December 31, 2018 , the fair value of our credit agreement borrowings reasonably approximated the carrying value of $1.7 billion . In addition, based on market conditions, the fair values of the outstanding borrowings under the receivables facility reasonably approximated the carrying values of $80 million and $110 million at March 31, 2019 and December 31, 2018 , respectively. As of March 31, 2019 and December 31, 2018 , the fair values of the U.S. Notes (2023) were approximately $603 million and $574 million , respectively, compared to a carrying value of $600 million at each date. As of March 31, 2019 and December 31, 2018 , the fair values of the Euro Notes (2024) were approximately $599 million and $586 million compared to carrying values of $561 million and $573 million , respectively. As of March 31, 2019 , the fair value of the Euro Notes (2026/28) was $1.2 billion compared to a carrying value of $ 1.1 billion ; as of December 31, 2018 , the fair value of the Euro Notes (2026/28) approximated the carrying value of $1.1 billion . The fair value measurements of the borrowings under our credit agreement and receivables facility are classified as Level 2 within the fair value hierarchy since they are determined based upon significant inputs observable in the market, including interest rates on recent financing transactions with similar terms and maturities. We estimated the fair value by calculating the upfront cash payment a market participant would require at March 31, 2019 to assume these obligations. The fair value of our U.S. Notes (2023) is classified as Level 1 within the fair value hierarchy since it is determined based upon observable market inputs including quoted market prices in an active market. The fair values of our Euro Notes (2024) and Euro Notes (2026/28) are determined based upon observable market inputs including quoted market prices in markets that are not active, and therefore are classified as Level 2 within the fair value hierarchy.

Leases (Notes)

Leases (Notes)	3 Months Ended
	Mar. 31, 2019
Leases [Abstract]
Leases [Text Block]	Leases We lease certain warehouses, distribution centers, retail stores, office space, land, vehicles and equipment. We determine if an arrangement is a lease at inception. Operating lease right-of-use ("ROU") assets and operating lease liabilities are recognized based on the present value of the future minimum lease payments over the lease term at the commencement date. As the implicit rate for most of our leases is not readily determinable, we use our incremental borrowing rate based on the information available at commencement date in determining the present value of future payments. Upon adoption of the new lease standard, we utilized the incremental borrowing rate as of the date of adoption. We determine our incremental borrowing rate by analyzing yield curves with consideration of lease term, and country and company specific factors. The operating lease ROU asset also includes any lease prepayments and excludes lease incentives. Many of our leases include one or more options to renew, with renewal terms that can extend the lease term from 1 to 40 years or more. Our lease terms assumed in our measurement of the ROU assets and lease liabilities may include options to extend or terminate the lease when it is reasonably certain that we will exercise that option. Certain leases also include options to purchase the leased property. The depreciable life of assets and leasehold improvements are limited by the expected lease term, unless there is a transfer of title or purchase option reasonably certain of exercise. Some of our lease agreements include rental payments adjusted periodically for inflation. Most of these adjustments are considered variable lease costs. Other variable lease costs consist of certain non-lease components that are disclosed as lease costs due to our election of the practical expedient to combine lease and non-lease components and include items such as variable payments for utilities, property taxes, common area maintenance, sales taxes, and insurance. For leases with an initial term of 12 months or less, we have not recognized a right-of-use asset or lease liability on the Unaudited Condensed Consolidated Balance Sheets; we recognize lease expense for these leases on a straight-line basis over the lease terms. We guarantee the residual values for the majority of our vehicles. The residual values decline over the lease terms to a defined percentage of original cost. In the event the lessor does not realize the residual value when a vehicle is sold, we would be responsible for a portion of the shortfall. Similarly, if the lessor realizes more than the residual value when a vehicle is sold, we would be paid the amount realized over the residual value. Had we terminated all of our operating leases subject to these guarantees at March 31, 2019, our portion of the guaranteed residual value would have totaled approximately $76 million . Other than the residual value guarantees associated with our vehicles discussed above, we do not have any other material residual value guarantees or restrictive covenants. The amounts recorded in the unaudited condensed consolidated balance sheet as of March 31, 2019 related to our lease agreements are as follows (in thousands): Leases Classification March 31, 2019 Assets Operating lease assets, net Operating lease assets, net $ 1,279,576 Finance lease assets, net Property, plant and equipment, net 42,311 Total leased assets $ 1,321,887 Liabilities Current Operating Current portion of operating lease liabilities $ 216,172 Finance Current portion of long-term obligations 10,658 Noncurrent Operating Long-term operating lease liabilities 1,109,814 Finance Long-term obligations, excluding current portion 31,502 Total lease liabilities $ 1,368,146 The components of lease expense are as follows (in thousands): Three Months Ended Lease Cost Classification March 31, 2019 Operating lease cost Cost of goods sold $ 3,835 Operating lease cost Selling, general and administrative expenses 73,282 Short-term lease cost Selling, general and administrative expenses 667 Variable lease cost Selling, general and administrative expenses 25,990 Finance lease cost Amortization of leased assets Depreciation and amortization 2,598 Interest on lease liabilities Interest expense, net of interest income 448 Sublease income Other income, net (275 ) Net lease cost $ 106,545 The future minimum lease commitments under our noncancelable operating leases at December 31, 2018 were as follows (in thousands): Years ending December 31: 2019 $ 294,269 2020 256,172 2021 210,632 2022 158,763 2023 131,518 Thereafter 777,165 Future Minimum Lease Payments $ 1,828,519 The future minimum lease commitments under our leases at March 31, 2019 are as follows (in thousands): Operating leases Finance leases (1) Total Nine months ending December 31, 2019 $ 222,074 $ 9,087 $ 231,161 Years ending December 31: 2020 265,133 10,705 275,838 2021 217,839 8,571 226,410 2022 166,904 6,214 173,118 2023 138,834 2,676 141,510 2024 115,318 2,210 117,528 Thereafter 704,382 16,481 720,863 Future minimum lease payments 1,830,484 55,944 1,886,428 Less: Interest 504,498 13,784 518,282 Present value of lease liabilities $ 1,325,986 $ 42,160 $ 1,368,146 (1) Amounts are included in the scheduled maturities of long-term obligations in the “Liquidity and Capital Resources,” section of Management's Discussion and Analysis of Financial Condition and Results of Operations in Part I, Item 2 of this Quarterly Report on Form 10-Q. As of March 31, 2019, we have additional minimum operating lease payments for leases that have not yet commenced of $103 million . These operating leases will commence between April 1, 2019 and December 31, 2020 with lease terms of 2 to 20 years. Most of these leases have not commenced as the assets are in the process of being constructed. We have appropriately considered the build-to-suit and sale-leaseback guidance where appropriate on these leases. No significant build-to-suit or sale-leaseback transactions have been identified. Other information related to leases was as follows: Lease Term and Discount Rate March 31, 2019 Weighted-average remaining lease term (years) Operating leases 9.8 Finance leases 8.8 Weighted-average discount rate Operating leases 5.4 % Finance leases 4.5 % Three Months Ended Supplemental cash flows information (in thousands) March 31, 2019 Cash paid for amounts included in the measurement of lease liabilities Operating cash flows from operating leases $ 73,976 Financing cash flows from finance leases 2,642 Leased assets obtained in exchange for new finance lease liabilities 5,245 Leased assets obtained in exchange for new operating lease liabilities 28,563

Employee Benefit Plans (Notes)

Employee Benefit Plans (Notes)	3 Months Ended
	Mar. 31, 2019
Retirement Benefits [Abstract]
Pension and Other Postretirement Benefits Disclosure [Text Block]	Employee Benefit Plans We have funded and unfunded defined benefit plans covering certain employee groups in the U.S. and various European countries. Local statutory requirements govern many of our European plans. The defined benefit plans are mostly closed to new participants and, in some cases, existing participants no longer accrue benefits. As of both March 31, 2019 and December 31, 2018 , the aggregate funded status of the defined benefit plans was a liability of $110 million , and is reported in Other noncurrent liabilities and Accrued payroll-related liabilities on our Unaudited Condensed Consolidated Balance Sheets. Net periodic benefit cost for our defined benefit plans included the following components for the three months ended March 31, 2019 and 2018 (in thousands): Three Months Ended March 31, 2019 2018 Service cost $ 587 $ 468 Interest cost 985 670 Expected return on plan assets (780 ) (717 ) Amortization of actuarial (gain) loss 253 — Net periodic benefit cost $ 1,045 $ 421 For the three months ended March 31, 2019 and 2018 , the service cost component of net periodic benefit cost was classified in Selling, general and administrative expenses, while the other components of net periodic benefit cost were classified in Other income, net in our Unaudited Condensed Consolidated Statements of Income.

Income Taxes (Notes)

Income Taxes (Notes)	3 Months Ended
	Mar. 31, 2019
Income Tax Disclosure [Abstract]
Income Tax Disclosure [Text Block]	Income Taxes At the end of each interim period, we estimate our annual effective tax rate and apply that rate to our interim earnings. We also record the tax impact of certain unusual or infrequently occurring items, including changes in judgment about valuation allowances and the effects of changes in tax laws or rates, in the interim period in which they occur. The computation of the annual estimated effective tax rate at each interim period requires certain estimates and significant judgment including, but not limited to, the expected operating income for the year, projections of the proportion of income earned and taxed in state and foreign jurisdictions, permanent and temporary differences between book and taxable income, and the likelihood of recovering deferred tax assets generated in the current year. The accounting estimates used to compute the provision for income taxes may change as new events occur, additional information is obtained or as the tax environment changes. Our effective income tax rate for the three months ended March 31, 2019 was 27.1% , compared to 24.7% for the comparable prior year period. The increase was primarily attributable to the impact of a favorable discrete item of approximately $3 million for the three months ended March 31, 2018, for excess tax benefits from stock-based payments; there was an immaterial amount for the three months ended March 31, 2019. The year over year change for this discrete item increased the effective tax rate by 1.3% compared to the prior year period, while the remaining discrete items increased the effective tax rate by an immaterial amount compared to the prior year period. The effective tax rate increase was also due to an approximately 1.0% increase in the effective tax rate as a result of the Stahlgruber acquisition, including the higher effective tax rate in Germany and the impact of suspended interest deductions due to thin capitalization constraints.

Segment and Geographic Informat

Segment and Geographic Information	3 Months Ended
	Mar. 31, 2019
Segment Reporting [Abstract]
Segment and Geographic Information	Segment and Geographic Information We have four operating segments: Wholesale – North America, Europe, Specialty and Self Service. Our Wholesale – North America and Self Service operating segments are aggregated into one reportable segment, North America, because they possess similar economic characteristics and have common products and services, customers, and methods of distribution. Our reportable segments are organized based on a combination of geographic areas served and type of product lines offered. The reportable segments are managed separately as each business serves different customers (i.e. geographic in the case of North America and Europe and product type in the case of Specialty) and is affected by different economic conditions. Therefore, we present three reportable segments: North America, Europe and Specialty. The following tables present our financial performance by reportable segment for the periods indicated (in thousands): North America Europe Specialty Eliminations Consolidated Three Months Ended March 31, 2019 Revenue: Third Party $ 1,302,206 $ 1,445,541 $ 352,556 $ — $ 3,100,303 Intersegment 103 — 1,181 (1,284 ) — Total segment revenue $ 1,302,309 $ 1,445,541 $ 353,737 $ (1,284 ) $ 3,100,303 Segment EBITDA $ 176,636 $ 105,298 $ 37,959 $ — $ 319,893 Depreciation and amortization (1) 22,239 47,011 6,957 — 76,207 Three Months Ended March 31, 2018 Revenue: Third Party $ 1,329,660 $ 1,040,430 $ 350,674 $ — $ 2,720,764 Intersegment 183 — 1,118 (1,301 ) — Total segment revenue $ 1,329,843 $ 1,040,430 $ 351,792 $ (1,301 ) $ 2,720,764 Segment EBITDA $ 177,713 $ 75,534 $ 41,969 $ — $ 295,216 Depreciation and amortization (1) 21,228 32,757 7,081 — 61,066 (1) Amounts presented include depreciation and amortization expense recorded within cost of goods sold. The key measure of segment profit or loss reviewed by our chief operating decision maker, who is our Chief Executive Officer, is Segment EBITDA. Segment EBITDA includes revenue and expenses that are controllable by the segment. Corporate general and administrative expenses are allocated to the segments based on usage, with shared expenses apportioned based on the segment's percentage of consolidated revenue. We calculate Segment EBITDA as EBITDA excluding restructuring and acquisition related expenses, change in fair value of contingent consideration liabilities, other gains and losses related to acquisitions, equity method investments, or divestitures, equity in losses and earnings of unconsolidated subsidiaries, and impairment charges. EBITDA, which is the basis for Segment EBITDA, is calculated as net income, less net income (loss) attributable to noncontrolling interest, excluding depreciation, amortization, interest and income tax expense. The table below provides a reconciliation of Net Income to Segment EBITDA (in thousands): Three Months Ended March 31, 2019 2018 Net income $ 99,063 $ 152,763 Less: net income (loss) attributable to noncontrolling interest 1,015 (197 ) Net income attributable to LKQ stockholders 98,048 152,960 Add: Depreciation and amortization 71,002 56,458 Depreciation and amortization - cost of goods sold 5,205 4,608 Interest expense, net of interest income 36,089 28,515 Provision for income taxes 51,550 49,584 EBITDA 261,894 292,125 Subtract: Equity in (losses) earnings of unconsolidated subsidiaries (1) (39,549 ) 1,412 Add: Restructuring and acquisition related expenses (2) 3,307 4,054 Inventory step-up adjustment - acquisition related — 403 Impairment of net assets held for sale (3) 15,023 — Change in fair value of contingent consideration liabilities 120 46 Segment EBITDA $ 319,893 $ 295,216 (1) Refer to "Investments in Unconsolidated Subsidiaries" in Note 3, "Financial Statement Information ," for further information. (2) Refer to Note 5, "Restructuring and Acquisition Related Expenses ," for further information. (3) Refer to "Net Assets Held for Sale" in Note 3, "Financial Statement Information ," for further information. The following table presents capital expenditures by reportable segment (in thousands): Three Months Ended March 31, 2019 2018 Capital Expenditures North America $ 31,234 $ 29,662 Europe 19,577 28,815 Specialty 2,205 3,712 Total capital expenditures $ 53,016 $ 62,189 The following table presents assets by reportable segment (in thousands): March 31, December 31, 2019 2018 Receivables, net North America $ 445,056 $ 411,818 Europe 770,543 649,174 Specialty 137,892 93,091 Total receivables, net 1,353,491 1,154,083 Inventories North America 994,438 1,076,306 Europe 1,363,929 1,410,264 Specialty 333,639 349,505 Total inventories 2,692,006 2,836,075 Property, plant and equipment, net North America 574,046 570,508 Europe 546,725 562,600 Specialty 85,571 87,054 Total property, plant and equipment, net 1,206,342 1,220,162 Operating lease assets, net (1) North America 757,590 — Europe 438,272 — Specialty 83,714 — Total operating lease assets, net 1,279,576 — Equity method investments North America 17,551 16,404 Europe (2) 116,683 162,765 Total equity method investments 134,234 179,169 Other unallocated assets 6,000,261 6,003,913 Total assets $ 12,665,910 $ 11,393,402 (1) Refer to " Note 12, "Leases ," for further information. (2) Refer to "Investments in Unconsolidated Subsidiaries" in Note 3, "Financial Statement Information ," for further information. We report net receivables; inventories; net property , plant and equipment; net operating lease assets; and equity method investments by segment as that information is used by the chief operating decision maker in assessing segment performance. These assets provide a measure for the operating capital employed in each segment. Unallocated assets include cash and cash equivalents, prepaid and other current and noncurrent assets, goodwill and other intangibles. Our largest countries of operation are the U.S., followed by the U.K. and Germany. Our other European operations are located in the Netherlands, Italy, Czech Republic, Belgium, Poland, Slovakia, Austria, and other European countries. Our operations in other countries include operations in Canada, engine remanufacturing and bumper refurbishing operations in Mexico, an aftermarket parts freight consolidation warehouse in Taiwan, and administrative support functions in India. Our net sales are attributed to geographic area based on the location of the selling operation. The following table sets forth our revenue by geographic area (in thousands): Three Months Ended March 31, 2019 2018 Revenue United States $ 1,542,026 $ 1,560,027 United Kingdom 412,813 430,992 Germany 386,465 803 Other countries 758,999 728,942 Total revenue $ 3,100,303 $ 2,720,764 The following table sets forth our tangible long-lived assets by geographic area (in thousands): March 31, December 31, 2019 2018 Long-lived assets (1) United States $ 1,424,978 $ 620,125 Germany 305,442 217,476 United Kingdom 339,147 165,145 Other countries 416,351 217,416 Total long-lived assets $ 2,485,918 $ 1,220,162 (1) The increase in long-lived assets is related to the net operating lease assets added as a result of the adoption of the new lease accounting standard. Refer to " Note 12, "Leases ," for further information.

Condensed Consolidating Financi

Condensed Consolidating Financial Information	3 Months Ended
	Mar. 31, 2019
Condensed Consolidating Financial Information [Abstract]
Condensed Financial Statements [Text Block]	Condensed Consolidating Financial Information LKQ Corporation (the "Parent") issued, and the Guarantors have fully and unconditionally guaranteed, jointly and severally, the U.S. Notes (2023) due on May 15, 2023. A Guarantor's guarantee will be unconditionally and automatically released and discharged upon the occurrence of any of the following events: (i) a transfer (including as a result of consolidation or merger) by the Guarantor to any person that is not a Guarantor of all or substantially all assets and properties of such Guarantor, provided the Guarantor is also released from its obligations with respect to indebtedness under the Credit Agreement or other indebtedness of ours, which obligation gave rise to the guarantee of the U.S. Notes (2023); (ii) a transfer (including as a result of consolidation or merger) to any person that is not a Guarantor of the equity interests of a Guarantor or issuance by a Guarantor of its equity interests such that the Guarantor ceases to be a subsidiary, as defined in the U.S. Notes (2023) Indenture, provided the Guarantor is also released from its obligations with respect to indebtedness under the Credit Agreement or other indebtedness of ours, which obligation gave rise to the guarantee of the U.S. Notes (2023); (iii) the release of the Guarantor from its obligations with respect to indebtedness under the Credit Agreement or other indebtedness of ours, which obligation gave rise to the guarantee of the U.S. Notes (2023); and (iv) upon legal defeasance, covenant defeasance or satisfaction and discharge of the U.S. Notes (2023) Indenture, as defined in the U.S. Notes (2023) Indenture. Presented below are the unaudited condensed consolidating financial statements of the Parent, the Guarantors, the non-guarantor subsidiaries (the "Non-Guarantors"), and the elimination entries necessary to present our financial statements on a consolidated basis as required by Rule 3-10 of Regulation S-X of the Securities Exchange Act of 1934 resulting from the guarantees of the U.S. Notes (2023). Investments in consolidated subsidiaries have been presented under the equity method of accounting. The principal elimination entries eliminate investments in subsidiaries, intercompany balances, and intercompany revenue and expenses. The unaudited condensed consolidating financial statements below have been prepared from our financial information on the same basis of accounting as the unaudited condensed consolidated financial statements, and may not necessarily be indicative of the financial position, results of operations or cash flows had the Parent, Guarantors and Non-Guarantors operated as independent entities. LKQ CORPORATION AND SUBSIDIARIES Unaudited Condensed Consolidating Statements of Income (In thousands) For the Three Months Ended March 31, 2019 Parent Guarantors Non-Guarantors Eliminations Consolidated Revenue $ — $ 1,550,680 $ 1,586,877 $ (37,254 ) $ 3,100,303 Cost of goods sold — 921,489 1,007,804 (37,254 ) 1,892,039 Gross margin — 629,191 579,073 — 1,208,264 Selling, general and administrative expenses 9,038 432,387 455,107 — 896,532 Restructuring and acquisition related expenses — 606 2,701 — 3,307 Impairment of net assets held for sale — 8,461 6,562 — 15,023 Depreciation and amortization 54 25,073 45,875 — 71,002 Operating (loss) income (9,092 ) 162,664 68,828 — 222,400 Other expense (income): Interest expense (income), net of interest income 13,836 (336 ) 22,589 — 36,089 Intercompany interest (income) expense, net (15,086 ) 9,189 5,897 — — Other expense (income), net 19 (7,831 ) 3,961 — (3,851 ) Total other (income) expense, net (1,231 ) 1,022 32,447 — 32,238 (Loss) income before (benefit) provision for income taxes (7,861 ) 161,642 36,381 — 190,162 (Benefit) provision for income taxes (2,046 ) 43,303 10,293 — 51,550 Equity in earnings (losses) of unconsolidated subsidiaries — 1,147 (40,696 ) — (39,549 ) Equity in earnings of subsidiaries 103,863 9,712 — (113,575 ) — Net income (loss) 98,048 129,198 (14,608 ) (113,575 ) 99,063 Less: net income attributable to noncontrolling interest — — 1,015 — 1,015 Net income (loss) attributable to LKQ stockholders $ 98,048 $ 129,198 $ (15,623 ) $ (113,575 ) $ 98,048 LKQ CORPORATION AND SUBSIDIARIES Unaudited Condensed Consolidating Statements of Income (In thousands) For the Three Months Ended March 31, 2018 Parent Guarantors Non-Guarantors Eliminations Consolidated Revenue $ — $ 1,577,595 $ 1,180,242 $ (37,073 ) $ 2,720,764 Cost of goods sold — 945,915 757,951 (37,073 ) 1,666,793 Gross margin — 631,680 422,291 — 1,053,971 Selling, general and administrative expenses 9,130 426,797 330,964 — 766,891 Restructuring and acquisition related expenses — 330 3,724 — 4,054 Depreciation and amortization 29 24,338 32,091 — 56,458 Operating (loss) income (9,159 ) 180,215 55,512 — 226,568 Other expense (income): Interest expense, net of interest income 18,008 212 10,295 — 28,515 Intercompany interest (income) expense, net (15,400 ) 9,680 5,720 — — Other (income) expense, net (1,015 ) (5,882 ) 4,015 — (2,882 ) Total other expense, net 1,593 4,010 20,030 — 25,633 (Loss) income before (benefit) provision for income taxes (10,752 ) 176,205 35,482 — 200,935 (Benefit) provision for income taxes (3,904 ) 45,877 7,611 — 49,584 Equity in earnings of unconsolidated subsidiaries — — 1,412 — 1,412 Equity in earnings of subsidiaries 159,808 5,110 — (164,918 ) — Net income 152,960 135,438 29,283 (164,918 ) 152,763 Less: net loss attributable to noncontrolling interest — — (197 ) — (197 ) Net income attributable to LKQ stockholders $ 152,960 $ 135,438 $ 29,480 $ (164,918 ) $ 152,960 LKQ CORPORATION AND SUBSIDIARIES Unaudited Condensed Consolidating Statements of Comprehensive Income (In thousands) For the Three Months Ended March 31, 2019 Parent Guarantors Non-Guarantors Eliminations Consolidated Net income (loss) $ 98,048 $ 129,198 $ (14,608 ) $ (113,575 ) $ 99,063 Less: net income attributable to noncontrolling interest — — 1,015 — 1,015 Net income (loss) attributable to LKQ stockholders 98,048 129,198 (15,623 ) (113,575 ) 98,048 Other comprehensive income (loss): Foreign currency translation, net of tax (9,895 ) 2,194 (10,466 ) 8,272 (9,895 ) Net change in unrealized gains/losses on cash flow hedges, net of tax (2,737 ) — — — (2,737 ) Net change in unrealized gains/losses on pension plans, net of tax 191 (4 ) 195 (191 ) 191 Net change in other comprehensive loss from unconsolidated subsidiaries (3,463 ) — (3,463 ) 3,463 (3,463 ) Other comprehensive (loss) income (15,904 ) 2,190 (13,734 ) 11,544 (15,904 ) Comprehensive income (loss) 82,144 131,388 (28,342 ) (102,031 ) 83,159 Less: comprehensive income attributable to noncontrolling interest — — 1,015 — 1,015 Comprehensive income (loss) attributable to LKQ stockholders $ 82,144 $ 131,388 $ (29,357 ) $ (102,031 ) $ 82,144 LKQ CORPORATION AND SUBSIDIARIES Unaudited Condensed Consolidating Statements of Comprehensive Income (In thousands) For the Three Months Ended March 31, 2018 Parent Guarantors Non-Guarantors Eliminations Consolidated Net income $ 152,960 $ 135,438 $ 29,283 $ (164,918 ) $ 152,763 Less: net loss attributable to noncontrolling interest — — (197 ) — (197 ) Net income attributable to LKQ stockholders 152,960 135,438 29,480 (164,918 ) 152,960 Other comprehensive income (loss): Foreign currency translation, net of tax 48,485 (2,183 ) 49,055 (46,872 ) 48,485 Net change in unrealized gains/losses on cash flow hedges, net of tax 3,254 — — — 3,254 Net change in unrealized gains/losses on pension plans, net of tax (621 ) (621 ) — 621 (621 ) Net change in other comprehensive loss from unconsolidated subsidiaries (605 ) — (605 ) 605 (605 ) Other comprehensive income (loss) 50,513 (2,804 ) 48,450 (45,646 ) 50,513 Comprehensive income 203,473 132,634 77,733 (210,564 ) 203,276 Less: comprehensive loss attributable to noncontrolling interest — — (197 ) — (197 ) Comprehensive income attributable to LKQ stockholders $ 203,473 $ 132,634 $ 77,930 $ (210,564 ) $ 203,473 LKQ CORPORATION AND SUBSIDIARIES Unaudited Condensed Consolidating Balance Sheets (In thousands) March 31, 2019 Parent Guarantors Non-Guarantors Eliminations Consolidated Assets Current assets: Cash and cash equivalents $ 40,703 $ 31,744 $ 243,619 $ — $ 316,066 Receivables, net 386 366,235 986,870 — 1,353,491 Intercompany receivables, net 7,411 — 19,147 (26,558 ) — Inventories — 1,245,544 1,446,462 — 2,692,006 Prepaid expenses and other current assets 4,668 162,616 115,923 — 283,207 Total current assets 53,168 1,806,139 2,812,021 (26,558 ) 4,644,770 Property, plant and equipment, net 1,630 600,965 603,747 — 1,206,342 Operating lease assets, net 3,857 801,420 474,299 — 1,279,576 Intangible assets: Goodwill — 1,973,101 2,381,205 — 4,354,306 Other intangibles, net 234 260,491 628,884 — 889,609 Investment in subsidiaries 5,288,058 123,496 — (5,411,554 ) — Intercompany notes receivable 1,183,505 51,118 — (1,234,623 ) — Equity method investments — 17,551 116,683 — 134,234 Other assets 72,335 40,183 44,555 — 157,073 Total assets $ 6,602,787 $ 5,674,464 $ 7,061,394 $ (6,672,735 ) $ 12,665,910 Liabilities and Stockholders’ Equity Current liabilities: Accounts payable $ 2,111 $ 339,448 $ 611,129 $ — $ 952,688 Intercompany payables, net — 19,147 7,411 (26,558 ) — Accrued expenses: Accrued payroll-related liabilities 4,967 33,658 104,401 — 143,026 Other accrued expenses 12,930 105,465 199,431 — 317,826 Refund liability — 51,082 54,353 — 105,435 Other current liabilities 16,590 22,596 60,872 — 100,058 Current portion of operating lease liabilities 204 116,053 99,915 — 216,172 Current portion of long-term obligations 10,649 3,326 122,308 — 136,283 Total current liabilities 47,451 690,775 1,259,820 (26,558 ) 1,971,488 Long-term operating lease liabilities, excluding current portion 4,054 712,259 393,501 — 1,109,814 Long-term obligations, excluding current portion 1,624,269 16,248 2,452,249 — 4,092,766 Intercompany notes payable — 577,301 657,322 (1,234,623 ) — Deferred income taxes 7,187 135,287 163,296 — 305,770 Other noncurrent liabilities 120,344 75,446 133,508 — 329,298 Stockholders' equity: Total Company stockholders’ equity 4,799,482 3,467,148 1,944,406 (5,411,554 ) 4,799,482 Noncontrolling interest — — 57,292 — 57,292 Total stockholders’ equity 4,799,482 3,467,148 2,001,698 (5,411,554 ) 4,856,774 Total liabilities and stockholders' equity $ 6,602,787 $ 5,674,464 $ 7,061,394 $ (6,672,735 ) $ 12,665,910 LKQ CORPORATION AND SUBSIDIARIES Unaudited Condensed Consolidating Balance Sheets (In thousands) December 31, 2018 Parent Guarantors Non-Guarantors Eliminations Consolidated Assets Current assets: Cash and cash equivalents $ 25,633 $ 29,285 $ 276,843 $ — $ 331,761 Receivables, net 310 316,726 837,047 — 1,154,083 Intercompany receivables, net 6,978 — 12,880 (19,858 ) — Inventories — 1,343,612 1,492,463 — 2,836,075 Prepaid expenses and other current assets 18,611 99,356 81,063 — 199,030 Total current assets 51,532 1,788,979 2,700,296 (19,858 ) 4,520,949 Property, plant and equipment, net 1,547 600,054 618,561 — 1,220,162 Intangible assets: Goodwill — 1,973,364 2,408,094 — 4,381,458 Other intangibles, net 260 272,451 656,041 — 928,752 Investment in subsidiaries 5,224,006 111,826 — (5,335,832 ) — Intercompany notes receivable 1,220,582 10,515 — (1,231,097 ) — Equity method investments — 16,404 162,765 — 179,169 Other assets 70,283 40,548 52,081 — 162,912 Total assets $ 6,568,210 $ 4,814,141 $ 6,597,838 $ (6,586,787 ) $ 11,393,402 Liabilities and Stockholders’ Equity Current liabilities: Accounts payable $ 2,454 $ 343,116 $ 596,828 $ — $ 942,398 Intercompany payables, net — 12,880 6,978 (19,858 ) — Accrued expenses: Accrued payroll-related liabilities 6,652 70,267 95,086 — 172,005 Other accrued expenses 5,454 105,672 177,299 — 288,425 Refund liability — 50,899 53,686 — 104,585 Other current liabilities 283 17,860 42,966 — 61,109 Current portion of long-term obligations 8,459 2,932 110,435 — 121,826 Total current liabilities 23,302 603,626 1,083,278 (19,858 ) 1,690,348 Long-term obligations, excluding current portion 1,628,677 13,532 2,546,465 — 4,188,674 Intercompany notes payable — 597,283 633,814 (1,231,097 ) — Deferred income taxes 8,045 135,355 168,034 — 311,434 Other noncurrent liabilities 125,888 99,147 139,159 — 364,194 Stockholders' equity: Total Company stockholders’ equity 4,782,298 3,365,198 1,970,634 (5,335,832 ) 4,782,298 Noncontrolling interest — — 56,454 — 56,454 Total stockholders’ equity 4,782,298 3,365,198 2,027,088 (5,335,832 ) 4,838,752 Total liabilities and stockholders' equity $ 6,568,210 $ 4,814,141 $ 6,597,838 $ (6,586,787 ) $ 11,393,402 LKQ CORPORATION AND SUBSIDIARIES Unaudited Condensed Consolidating Statements of Cash Flows (In thousands) For the Three Months Ended March 31, 2019 Parent Guarantors Non-Guarantors (1) Eliminations Consolidated CASH FLOWS FROM OPERATING ACTIVITIES: Net cash provided by operating activities $ 65,970 $ 9,150 $ 54,335 $ 47,770 $ 177,225 CASH FLOWS FROM INVESTING ACTIVITIES: Purchases of property, plant and equipment (438 ) (30,128 ) (22,450 ) — (53,016 ) Investment and intercompany note activity with subsidiaries 23,342 — — (23,342 ) — Acquisitions, net of cash acquired — (152 ) (4,633 ) — (4,785 ) Receipts of deferred purchase price on receivables under factoring arrangements — 75,123 — (75,123 ) — Other investing activities, net — 89 (72 ) — 17 Net cash provided by (used in) investing activities 22,904 44,932 (27,155 ) (98,465 ) (57,784 ) CASH FLOWS FROM FINANCING ACTIVITIES: Proceeds from exercise of stock options 1,334 — — — 1,334 Taxes paid related to net share settlements of stock-based compensation awards (1,505 ) — — — (1,505 ) Purchase of treasury stock (70,462 ) — — — (70,462 ) Borrowings under revolving credit facilities 194,000 — 90,641 — 284,641 Repayments under revolving credit facilities (194,966 ) — (117,373 ) — (312,339 ) Repayments under term loans (2,188 ) — — — (2,188 ) Borrowings under receivables securitization facility — — 6,600 — 6,600 Repayments under receivables securitization facility — — (36,910 ) — (36,910 ) Borrowings (repayments) of other debt, net — 763 (1,388 ) — (625 ) Other financing activities, net (17 ) — (1,260 ) — (1,277 ) Investment and intercompany note activity with parent — (25,502 ) 2,160 23,342 — Dividends — (27,353 ) — 27,353 — Net cash used in financing activities (73,804 ) (52,092 ) (57,530 ) 50,695 (132,731 ) Effect of exchange rate changes on cash, cash equivalents and restricted cash — 469 (2,982 ) — (2,513 ) Net increase (decrease) in cash, cash equivalents and restricted cash 15,070 2,459 (33,332 ) — (15,803 ) Cash, cash equivalents and restricted cash, beginning of period 25,633 29,285 282,332 — 337,250 Cash, cash equivalents and restricted cash, end of period $ 40,703 $ 31,744 $ 249,000 $ — $ 321,447 (1) Restricted cash is only included in the unaudited condensed consolidating financial statements of the Non-Guarantors. LKQ CORPORATION AND SUBSIDIARIES Unaudited Condensed Consolidating Statements of Cash Flows (In thousands) For the Three Months Ended March 31, 2018 Parent Guarantors Non-Guarantors Eliminations Consolidated CASH FLOWS FROM OPERATING ACTIVITIES: Net cash provided by operating activities $ 95,942 $ 35,802 $ 243 $ 13,176 $ 145,163 CASH FLOWS FROM INVESTING ACTIVITIES: Purchases of property, plant and equipment (163 ) (29,908 ) (32,118 ) — (62,189 ) Investment and intercompany note activity with subsidiaries 24,333 — — (24,333 ) — Acquisitions, net of cash acquired — (2,966 ) — — (2,966 ) Receipts of deferred purchase price on receivables under factoring arrangements (1) — 68,171 — (68,171 ) — Other investing activities, net — (145 ) 679 — 534 Net cash provided by (used in) investing activities 24,170 35,152 (31,439 ) (92,504 ) (64,621 ) CASH FLOWS FROM FINANCING ACTIVITIES: Proceeds from exercise of stock options 2,255 — — — 2,255 Taxes paid related to net share settlements of stock-based compensation awards (3,292 ) — — — (3,292 ) Borrowings under revolving credit facilities 161,000 — 40,669 — 201,669 Repayments under revolving credit facilities (291,966 ) — (29,559 ) — (321,525 ) Repayments under term loans (4,405 ) — — — (4,405 ) (Repayments) borrowings of other debt, net — (30 ) 4,439 — 4,409 Other financing activities, net (724 ) — 4,107 — 3,383 Investment and intercompany note activity with parent — (21,759 ) (2,574 ) 24,333 — Dividends — (54,995 ) — 54,995 — Net cash (used in) provided by financing activities (137,132 ) (76,784 ) 17,082 79,328 (117,506 ) Effect of exchange rate changes on cash and cash equivalents — (326 ) 3,203 — 2,877 Net decrease in cash and cash equivalents (17,020 ) (6,156 ) (10,911 ) — (34,087 ) Cash and cash equivalents, beginning of period 34,360 35,131 210,275 — 279,766 Cash and cash equivalents, end of period $ 17,340 $ 28,975 $ 199,364 $ — $ 245,679 (1) The amount was updated to reflect daily transactions compared to the monthly transactions as was initially calculated in the first quarter of 2018.

Financial Statement Informati_2

Financial Statement Information (Policies)	3 Months Ended
	Mar. 31, 2019
Accounting Policies [Abstract]
Commitments and Contingencies, Policy [Policy Text Block]	Litigation and Related Contingencies We have certain contingencies resulting from litigation, claims and other commitments and are subject to a variety of environmental and pollution control laws and regulations incident to the ordinary course of business. We currently expect that the resolution of such contingencies will not materially affect our financial position, results of operations or cash flows.
Disclosure of Long Lived Assets Held-for-sale [Table Text Block]	Net Assets Held for Sale During the first quarter of 2019, we committed to plans to sell certain businesses in our North America and Europe segments. As a result, these businesses were classified as net assets held for sale and were required to be adjusted to the lower of fair value less cost to sell or carrying value, resulting in total impairment charges of $15 million , which were recorded within Impairment of net assets held for sale in the Unaudited Condensed Consolidated Statement of Income. As of March 31, 2019, there were $88 million of assets held for sale, including $5 million of goodwill that was reclassified as held for sale related to our Europe segment, and $8 million of liabilities held for sale, which are recorded within Prepaid expenses and other current assets and Other current liabilities, respectively, on the Unaudited Condensed Consolidated Balance Sheet. We expect these businesses to be disposed of during the next twelve months. The businesses do not meet the requirements to be considered discontinued operations. These businesses generated annualized revenue of approximately $170 million during the twelve-month period ended March 31, 2019. We are required to record net assets of our held for sale businesses at the lower of fair value less cost to sell or carrying value. Fair values were based on projected discounted cash flows and/or estimated selling prices. Management's assumptions for our discounted cash flow analysis of the businesses were based on projecting revenues and profits, tax rates, capital expenditures, working capital requirements and discount rates. For businesses for which we utilized estimated selling prices to calculate the fair value, factors included projected market multiples and any legitimate offers. Due to the uncertainties in the estimation process, it is possible that actual results could differ from the estimates used in the Company's historical analysis. The inputs utilized in the fair value estimates are classified as Level 3 within the fair value hierarchy. The fair values of the net assets were measured on a non-recurring basis as of March 31, 2019.
Stockholders' Equity, Policy [Policy Text Block]	Treasury Stock On October 25, 2018, our Board of Directors authorized a stock repurchase program under which we may purchase up to $500 million of our common stock from time to time through October 25, 2021. Repurchases under the program may be made in the open market or in privately negotiated transactions, with the amount and timing of repurchases depending on market conditions and corporate needs. The repurchase program does not obligate us to acquire any specific number of shares and may be suspended or discontinued at any time. Delaware law imposes restrictions on stock repurchases. During the three months ended March 31, 2019, we repurchased 2.6 million shares of common stock for an aggregate price of $70 million . During 2018, we repurchased 2.3 million shares of common stock for an aggregate price of $60 million . As of March 31, 2019, there is $370 million of remaining capacity under our repurchase program. Repurchased shares are accounted for as treasury stock using the cost method.
Receivables and Allowance for Doubtful Accounts	Allowance for Doubtful Accounts We have a reserve for uncollectible accounts, which was approximately $55 million and $57 million at March 31, 2019 and December 31, 2018 , respectively.
Inventory	Inventories Inventories consist of the following (in thousands): March 31, December 31, 2019 2018 Aftermarket and refurbished products $ 2,229,681 $ 2,309,458 Salvage and remanufactured products 437,463 503,199 Manufactured products 24,862 23,418 Total inventories (1) $ 2,692,006 $ 2,836,075 (1) During the first quarter of 2019, $62 million of inventory was classified as held for sale. Refer to the "Net Assets Held for Sale" section for further information. Aftermarket and refurbished products and salvage and remanufactured products are primarily composed of finished goods. As of March 31, 2019 , manufactured products inventory was composed of $17 million of raw materials, $2 million of work in process, and $6 million of finished goods. As of December 31, 2018 , manufactured products inventory was composed of $17 million of raw materials, $2 million of work in process, and $4 million of finished goods.
Equity Method Investments [Policy Text Block]	Investments in Unconsolidated Subsidiaries Our investment in unconsolidated subsidiaries was $134 million and $179 million as of March 31, 2019 and December 31, 2018 , respectively. On December 1, 2016 , we acquired a 26.5% equity interest in Mekonomen AB ("Mekonomen") for an aggregate purchase price of $181 million . In October 2018, we acquired an additional $48 million of equity in Mekonomen at a discounted share price as part of its rights issue, increasing our equity interest to 26.6% . We are accounting for our interest in Mekonomen using the equity method of accounting, as our investment gives us the ability to exercise significant influence, but not control, over the investee. As of March 31, 2019, our share of the book value of Mekonomen's net assets exceeded the book value of our investment in Mekonomen by $5 million ; this difference is primarily related to Mekonomen's Accumulated Other Comprehensive Income balance as of our acquisition date in 2016. We are recording our equity in the net earnings of Mekonomen on a one quarter lag. We recorded an equity loss of $40 million during the three months ended March 31, 2019, compared to equity in earnings of $2 million during the three months ended March 31, 2018 related to our investment in Mekonomen, including adjustments to convert the results to GAAP and to recognize the impact of our purchase accounting adjustments and the other-than-temporary impairment (three months ended March 31, 2019 only) described below. In May 2018, we received a cash dividend of $8 million (SEK 67 million ) related to our investment in Mekonomen. Mekonomen announced in February 2019 that the Mekonomen Board of Directors has proposed no dividend payment in 2019. We evaluated our investment in Mekonomen for other-than-temporary impairment as of March 31, 2019, and concluded the decline in fair value was other-than-temporary due to a significant stock price decrease since December 31, 2018, the last date at which we recognized an other-than-temporary impairment charge related to our investment. Therefore, we recognized an other-than-temporary impairment of $40 million , which represented the difference in the carrying value and the fair value of our investment in Mekonomen. The fair value of our investment in Mekonomen was determined using the Mekonomen share price of SEK 65 as of March 31, 2019. The impairment charge is recorded in Equity in (losses) earnings of unconsolidated subsidiaries on our Unaudited Condensed Consolidated Statements of Income. Equity in losses and earnings from our investment in Mekonomen are reported in the Europe segment. As a result of the impairment charge, the Level 1 fair value of our equity investment in the publicly traded Mekonomen common stock at March 31, 2019 approximated the carrying value of $110 million .
Warranty Reserve	Warranty Reserve Some of our salvage mechanical products are sold with a standard six month warranty against defects. Additionally, some of our remanufactured engines are sold with a standard three year warranty against defects. We also provide a limited lifetime warranty for certain of our aftermarket products. These assurance-type warranties are not considered a separate performance obligation, and thus no transaction price is allocated to them. We record the warranty costs in Cost of goods sold on our Unaudited Condensed Consolidated Statements of Income. Our warranty reserve is calculated using historical claim information to project future warranty claims activity and is recorded within Other accrued expenses and Other noncurrent liabilities on our Unaudited Condensed Consolidated Balance Sheets based on the expected timing of the related payments. The changes in the warranty reserve are as follows (in thousands): Balance as of December 31, 2018 $ 23,262 Warranty expense 14,202 Warranty claims (12,499 ) Balance as of March 31, 2019 $ 24,965
Recent Accounting Pronouncements	Recent Accounting Pronouncements Adoption of New Lease Standard In February 2016, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update 2016-02, "Leases" ("ASU 2016-02"), which represents the FASB Accounting Standard Codification Topic 842 ("ASC 842"), to increase transparency and comparability by recognizing lease assets and lease liabilities on the Unaudited Condensed Consolidated Balance Sheets and disclosing key information about leasing arrangements. The main difference between the prior standard and ASU 2016-02 is the recognition of lease assets and lease liabilities by lessees for those leases classified as operating leases under the prior standard. We adopted the standard in the first quarter of 2019 using the modified retrospective approach and took advantage of the transition package of practical expedients permitted within the new standard, which, among other things, allows us to carryforward the historical lease classification. For leases with a term of 12 months or less, we elected the short-term lease exemption, which allowed us to not recognize right-of-use assets or lease liabilities for qualifying leases existing at transition and new leases we may enter into in the future. Additionally, we adopted the practical expedient to combine lease and non-lease components. As of January 1, 2019, we recorded both an operating lease asset and operating lease liability of $1.3 billion . The preexisting deferred rent liability balances from the historical straight-line treatment of operating leases was reclassified as a reduction of the lease asset upon adoption. The adoption of the standard did not materially affect our Unaudited Condensed Consolidated Statements of Income or Statements of Cash Flows as operating lease payments will still be an operating cash outflow and capital lease payments will still be a financing cash outflow. The new standard did not have a material impact on our liquidity. The standard will have no impact on our debt covenant compliance under our current agreements as the covenant calculations are based on the prior lease accounting rules. Other Recently Adopted Accounting Pronouncements During the first quarter of 2019, we adopted ASU No. 2017-12, "Targeted Improvements to Accounting for Hedging Activities" ("ASU 2017-12"), which amends the hedge accounting recognition and presentation requirements in ASC 815 ("Derivatives and Hedging"). ASU 2017-12 significantly alters the hedge accounting model by making it easier for an entity to achieve and maintain hedge accounting and provides for accounting that better reflects an entity's risk management activities. We adopted the provisions of ASU 2017-12 by applying a modified retrospective approach to existing hedging relationships as of the adoption date. The adoption of ASU 2017-12 did not have a material impact on our unaudited condensed consolidated financial statements. Recently Issued Accounting Pronouncements In August 2018, the FASB issued ASU No. 2018-13, "Disclosure Framework- Changes to the Disclosure Requirements for Fair Value Measurement" ("ASU 2018-13"), which removes, modifies, and adds certain disclosure requirements in ASC 820. ASU 2018-13 is effective for fiscal years and interim periods beginning after December 15, 2019; early adoption is permitted. We are in the process of evaluating the impact of this standard on our disclosures but do not believe that it will have a material impact. In June 2016, the FASB issued ASU 2016-13, "Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments" ("ASU 2016-13"), and in November 2018 issued a subsequent amendment, ASU 2018-19, "Codification Improvements to Topic 326, Financial Instruments - Credit Losses" ("ASU 2018-19"). ASU 2016-13 significantly changes how entities will measure credit losses for most financial assets and certain other instruments that are not measured at fair value through net income. ASU 2016-13 will replace today’s “incurred loss” approach with an “expected loss” model for instruments measured at amortized cost. ASU 2018-19 will affect loans, debt securities, trade receivables, net investments in leases, off balance sheet credit exposures, reinsurance receivables, and any other financial assets not excluded from the scope of this amendment that represent the contractual right to receive cash. ASU 2016-13 and ASU 2018-19 should be applied on either a prospective transition or modified-retrospective approach depending on the subtopic. ASU 2016-13 is effective for annual periods beginning after December 15, 2019, and interim periods therein. Early adoption is permitted for annual periods beginning after December 15, 2018, and interim periods therein. We are currently evaluating the impact of the adoption of this standard on our consolidated financial statements.

Revenue Recognition Revenue R_2

Revenue Recognition Revenue Recognition (Policies)	3 Months Ended
	Mar. 31, 2019
Revenue Recognition [Abstract]
Revenue Recognition, Policy [Policy Text Block]	Revenue Recognition The majority of our revenue is derived from the sale of vehicle parts. We recognize revenue when the products are shipped to, delivered to or picked up by customers, which is the point when title has transferred and risk of ownership has passed. Sources of Revenue We report our revenue in two categories: (i) parts and services and (ii) other. The following table sets forth our revenue by category, with our parts and services revenue further disaggregated by reportable segment (in thousands): Three Months Ended March 31, 2019 2018 North America $ 1,155,698 $ 1,172,585 Europe 1,440,841 1,037,046 Specialty 352,556 350,674 Parts and services 2,949,095 2,560,305 Other 151,208 160,459 Total revenue $ 3,100,303 $ 2,720,764 Parts and Services Our parts revenue is generated from the sale of vehicle products including replacement parts, components and systems used in the repair and maintenance of vehicles and specialty products and accessories to improve the performance, functionality and appearance of vehicles. Services revenue includes additional services that are generally billed concurrently with the related product sales, such as the sale of service-type warranties and fees for admission to our self service yards. In North America, our vehicle replacement products include sheet metal collision parts such as doors, hoods, and fenders; bumper covers; head and tail lamps; automotive glass products such as windshields; mirrors and grilles; wheels; and large mechanical items such as engines and transmissions. In Europe, our products include a wide variety of small mechanical products such as brake pads, discs and sensors; clutches; electrical products such as spark plugs and batteries; steering and suspension products; filters; and oil and automotive fluids. In our Specialty operations, we serve six product segments: truck and off-road; speed and performance; RV; towing; wheels, tires and performance handling; and miscellaneous accessories. Our service-type warranties typically have service periods ranging from 6 months to 36 months . Under ASC 606, proceeds from these service-type warranties are deferred at contract inception and amortized on a straight-line basis to revenue over the contract period. The changes in deferred service-type warranty revenue are as follows (in thousands): Balance as of January 1, 2019 $ 24,006 Additional warranty revenue deferred 10,875 Warranty revenue recognized (9,370 ) Balance as of March 31, 2019 $ 25,511 Other Revenue Revenue from other sources includes scrap sales, bulk sales to mechanical manufacturers (including cores) and sales of aluminum ingots and sows from our furnace operations. We derive scrap metal from several sources, including vehicles that have been used in both our wholesale and self service recycling operations and from original equipment manufacturers ("OEMs") and other entities that contract with us for secure disposal of "crush only" vehicles. The sale of hulks in our wholesale and self service recycling operations represents one performance obligation, and revenue is recognized based on a price per weight when the customer (processor) collects the scrap. Some adjustments may occur when the customer weighs the scrap at their location, and revenue is adjusted accordingly. Revenue by Geographic Area See Note 15, "Segment and Geographic Information " for information related to our revenue by geographic region. Variable Consideration The amount of revenue ultimately received from the customer can vary due to variable consideration which includes returns, discounts, rebates, refunds, credits, price concessions, incentives, performance bonuses, or other similar items. The previous revenue guidance required us to estimate the transaction price using a best estimate approach. Under ASC 606 we are required to select the “expected value method” or the “most likely amount” method in order to estimate variable consideration. We utilize both methods in practice depending on the type of variable consideration, with contemplation of any expected reversals in revenue. As of both March 31, 2019 and December 31, 2018 , we recorded a refund liability and return asset for expected returns of $105 million and $56 million , respectively. The refund liability is presented separately on the balance sheet within current liabilities while the return asset is presented within prepaid expenses and other current assets. Other types of variable consideration consist primarily of discounts, volume rebates, and other customer sales incentives which are recorded in Receivables, net on the Unaudited Condensed Consolidated Balance Sheets. We recorded a reserve for our variable consideration of $66 million and $103 million as of March 31, 2019 and December 31, 2018 , respectively. While other customer incentive programs exist, we characterize them as material rights in the context of our sales transactions. We consider these programs to be immaterial to our unaudited condensed consolidated financial statements.

Business Combinations (Tables)

Business Combinations (Tables)	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Business Combinations [Abstract]
Purchase Price Allocations For Acquisitions		The purchase price allocations for the acquisitions completed during the year ended December 31, 2018 are as follows (in thousands): Year Ended December 31, 2018 Stahlgruber Other Acquisitions (1) Total Receivables $ 144,826 $ 19,171 $ 163,997 Receivable reserves (2,818 ) (918 ) (3,736 ) Inventories 380,238 14,021 394,259 Prepaid expenses and other current assets 10,970 1,851 12,821 Property , plant and equipment 271,292 5,711 277,003 Goodwill 908,253 64,637 972,890 Other intangibles 285,255 35,159 320,414 Other assets 16,625 37 16,662 Deferred income taxes (78,130 ) (5,285 ) (83,415 ) Current liabilities assumed (346,788 ) (20,116 ) (366,904 ) Debt assumed (79,925 ) (4,875 ) (84,800 ) Other noncurrent liabilities assumed (2) (80,824 ) (10,306 ) (91,130 ) Noncontrolling interest (44,110 ) — (44,110 ) Contingent consideration liabilities — (3,107 ) (3,107 ) Other purchase price obligations (6,084 ) 3,623 (2,461 ) Stock issued (251,334 ) — (251,334 ) Notes issued — (11,347 ) (11,347 ) Gains on bargain purchases (3) — (2,418 ) (2,418 ) Settlement of other purchase price obligations (non-interest bearing) — 1,711 1,711 Cash used in acquisitions, net of cash and restricted cash acquired $ 1,127,446 $ 87,549 $ 1,214,995
Pro Forma Effect Of Businesses Acquired	The following pro forma summary presents the effect of the businesses acquired during the three months ended March 31, 2019 as though the businesses had been acquired as of January 1, 2018, and the businesses acquired during the year ended December 31, 2018 as though they had been acquired as of January 1, 2017. The pro forma adjustments are based upon unaudited financial information of the acquired entities (in thousands, except per share data): Three Months Ended March 31, 2019 2018 Revenue, as reported $ 3,100,303 $ 2,720,764 Revenue of purchased businesses for the period prior to acquisition: Stahlgruber — 489,534 Other acquisitions 5,980 43,005 Pro forma revenue $ 3,106,283 $ 3,253,303 Net income, as reported $ 99,063 $ 152,763 Net income of purchased businesses for the period prior to acquisition, and pro forma purchase accounting adjustments: Stahlgruber 3,074 1,273 Other acquisitions 330 334 Acquisition related expenses, net of tax (1) 224 1,526 Pro forma net income 102,691 155,896 Less: Net income (loss) attributable to noncontrolling interest, as reported 1,015 (197 ) Less: Pro forma net income attributable to noncontrolling interest — 528 Pro forma net income attributable to LKQ stockholders $ 101,676 $ 155,565

Financial Statement Informati_3

Financial Statement Information (Tables)	3 Months Ended
	Mar. 31, 2019
Property, Plant and Equipment [Line Items]
Warranty Reserve	Warranty Reserve Some of our salvage mechanical products are sold with a standard six month warranty against defects. Additionally, some of our remanufactured engines are sold with a standard three year warranty against defects. We also provide a limited lifetime warranty for certain of our aftermarket products. These assurance-type warranties are not considered a separate performance obligation, and thus no transaction price is allocated to them. We record the warranty costs in Cost of goods sold on our Unaudited Condensed Consolidated Statements of Income. Our warranty reserve is calculated using historical claim information to project future warranty claims activity and is recorded within Other accrued expenses and Other noncurrent liabilities on our Unaudited Condensed Consolidated Balance Sheets based on the expected timing of the related payments. The changes in the warranty reserve are as follows (in thousands): Balance as of December 31, 2018 $ 23,262 Warranty expense 14,202 Warranty claims (12,499 ) Balance as of March 31, 2019 $ 24,965
Equity Method Investments [Policy Text Block]	Investments in Unconsolidated Subsidiaries Our investment in unconsolidated subsidiaries was $134 million and $179 million as of March 31, 2019 and December 31, 2018 , respectively. On December 1, 2016 , we acquired a 26.5% equity interest in Mekonomen AB ("Mekonomen") for an aggregate purchase price of $181 million . In October 2018, we acquired an additional $48 million of equity in Mekonomen at a discounted share price as part of its rights issue, increasing our equity interest to 26.6% . We are accounting for our interest in Mekonomen using the equity method of accounting, as our investment gives us the ability to exercise significant influence, but not control, over the investee. As of March 31, 2019, our share of the book value of Mekonomen's net assets exceeded the book value of our investment in Mekonomen by $5 million ; this difference is primarily related to Mekonomen's Accumulated Other Comprehensive Income balance as of our acquisition date in 2016. We are recording our equity in the net earnings of Mekonomen on a one quarter lag. We recorded an equity loss of $40 million during the three months ended March 31, 2019, compared to equity in earnings of $2 million during the three months ended March 31, 2018 related to our investment in Mekonomen, including adjustments to convert the results to GAAP and to recognize the impact of our purchase accounting adjustments and the other-than-temporary impairment (three months ended March 31, 2019 only) described below. In May 2018, we received a cash dividend of $8 million (SEK 67 million ) related to our investment in Mekonomen. Mekonomen announced in February 2019 that the Mekonomen Board of Directors has proposed no dividend payment in 2019. We evaluated our investment in Mekonomen for other-than-temporary impairment as of March 31, 2019, and concluded the decline in fair value was other-than-temporary due to a significant stock price decrease since December 31, 2018, the last date at which we recognized an other-than-temporary impairment charge related to our investment. Therefore, we recognized an other-than-temporary impairment of $40 million , which represented the difference in the carrying value and the fair value of our investment in Mekonomen. The fair value of our investment in Mekonomen was determined using the Mekonomen share price of SEK 65 as of March 31, 2019. The impairment charge is recorded in Equity in (losses) earnings of unconsolidated subsidiaries on our Unaudited Condensed Consolidated Statements of Income. Equity in losses and earnings from our investment in Mekonomen are reported in the Europe segment. As a result of the impairment charge, the Level 1 fair value of our equity investment in the publicly traded Mekonomen common stock at March 31, 2019 approximated the carrying value of $110 million .
Schedule Of Inventory	Inventories consist of the following (in thousands): March 31, December 31, 2019 2018 Aftermarket and refurbished products $ 2,229,681 $ 2,309,458 Salvage and remanufactured products 437,463 503,199 Manufactured products 24,862 23,418 Total inventories (1) $ 2,692,006 $ 2,836,075
Schedule of Product Warranty Liability [Table Text Block]	The changes in the warranty reserve are as follows (in thousands): Balance as of December 31, 2018 $ 23,262 Warranty expense 14,202 Warranty claims (12,499 ) Balance as of March 31, 2019 $ 24,965
Cumulative Effect of Adoption of ASC 842 on Consolidated Financial Statements [Table Text Block]	In February 2016, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update 2016-02, "Leases" ("ASU 2016-02"), which represents the FASB Accounting Standard Codification Topic 842 ("ASC 842"), to increase transparency and comparability by recognizing lease assets and lease liabilities on the Unaudited Condensed Consolidated Balance Sheets and disclosing key information about leasing arrangements. The main difference between the prior standard and ASU 2016-02 is the recognition of lease assets and lease liabilities by lessees for those leases classified as operating leases under the prior standard. We adopted the standard in the first quarter of 2019 using the modified retrospective approach and took advantage of the transition package of practical expedients permitted within the new standard, which, among other things, allows us to carryforward the historical lease classification. For leases with a term of 12 months or less, we elected the short-term lease exemption, which allowed us to not recognize right-of-use assets or lease liabilities for qualifying leases existing at transition and new leases we may enter into in the future. Additionally, we adopted the practical expedient to combine lease and non-lease components. As of January 1, 2019, we recorded both an operating lease asset and operating lease liability of $1.3 billion . The preexisting deferred rent liability balances from the historical straight-line treatment of operating leases was reclassified as a reduction of the lease asset upon adoption. The adoption of the standard did not materially affect our Unaudited Condensed Consolidated Statements of Income or Statements of Cash Flows as operating lease payments will still be an operating cash outflow and capital lease payments will still be a financing cash outflow. The new standard did not have a material impact on our liquidity. The standard will have no impact on our debt covenant compliance under our current agreements as the covenant calculations are based on the prior lease accounting rules.

Revenue Recognition Disaggregat

Revenue Recognition Disaggregation of Revenue (Tables)	3 Months Ended
	Mar. 31, 2019
Disaggregation of Revenue [Line Items]
Disaggregation of Revenue [Table Text Block]	The following table sets forth our revenue by category, with our parts and services revenue further disaggregated by reportable segment (in thousands): Three Months Ended March 31, 2019 2018 North America $ 1,155,698 $ 1,172,585 Europe 1,440,841 1,037,046 Specialty 352,556 350,674 Parts and services 2,949,095 2,560,305 Other 151,208 160,459 Total revenue $ 3,100,303 $ 2,720,764

Revenue Recognition Product War

Revenue Recognition Product Warranty Liability (Tables)	3 Months Ended
	Mar. 31, 2019
Product Warranties Disclosures [Abstract]
Schedule of Product Warranty Liability [Table Text Block]	The changes in deferred service-type warranty revenue are as follows (in thousands): Balance as of January 1, 2019 $ 24,006 Additional warranty revenue deferred 10,875 Warranty revenue recognized (9,370 ) Balance as of March 31, 2019 $ 25,511

Equity Incentive Plans (Tables)

Equity Incentive Plans (Tables)	3 Months Ended
	Mar. 31, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Schedule of Nonvested Restricted Stock Units Activity	The following table summarizes activity related to our RSUs under the Equity Incentive Plan for the three months ended March 31, 2019 : Number Outstanding Weighted Average Grant Date Fair Value Weighted Average Remaining Contractual Term (in years) Aggregate Intrinsic Value (in thousands) (1) Unvested as of January 1, 2019 1,475,682 $ 34.94 Granted 832,974 $ 27.69 Vested (343,552 ) $ 33.47 Forfeited / Canceled (15,499 ) $ 34.01 Unvested as of March 31, 2019 1,949,605 $ 32.11 Expected to vest after March 31, 2019 1,737,948 $ 32.12 3.1 $ 49,323
Schedule of Nonvested Performance-based Units Activity	The following table summarizes activity related to our PSUs under the Equity Incentive Plan for the three months ended March 31, 2019 : Number Outstanding Weighted Average Grant Date Fair Value Weighted Average Remaining Contractual Term (in years) Aggregate Intrinsic Value (in thousands) (1) Unvested as of January 1, 2019 — $ — Granted (2) 116,094 $ 27.69 Unvested as of March 31, 2019 116,094 $ 27.69 Expected to vest after March 31, 2019 116,094 $ 27.69 2.8 $ 3,295
Schedule of Share-based Compensation, Stock Options, Activity	The following table summarizes activity related to our stock options under the Equity Incentive Plan for the three months ended March 31, 2019 : Number Outstanding Weighted Average Exercise Price Weighted Average Remaining Contractual Term (in years) Aggregate Intrinsic Value (in thousands) (1) Balance as of January 1, 2019 1,051,494 $ 10.15 Exercised (182,541 ) $ 7.31 $ 3,274 Canceled (6,528 ) $ 15.21 Balance as of March 31, 2019 862,425 $ 10.72 0.7 $ 15,362 Exercisable as of March 31, 2019 862,425 $ 10.72 0.7 $ 15,362

Earnings Per Share Schedule of

Earnings Per Share Schedule of Earnings Per Share, Basic and Diluted (Tables)	3 Months Ended
	Mar. 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): Three Months Ended March 31, 2019 2018 Net income $ 99,063 $ 152,763 Denominator for basic earnings per share—Weighted-average shares outstanding 315,046 309,517 Effect of dilutive securities: RSUs 414 619 PSUs — — Stock options 558 1,211 Denominator for diluted earnings per share—Adjusted weighted-average shares outstanding 316,018 311,347 Earnings per share, basic $ 0.31 $ 0.49 Earnings per share, diluted $ 0.31 $ 0.49

Earnings Per Share Schedule o_2

Earnings Per Share Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share (Tables)	3 Months Ended
	Mar. 31, 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]	The following table sets forth the number of employee stock-based compensation awards outstanding but not included in the computation of diluted earnings per share because their effect would have been antidilutive for the three months ended March 31, 2019 and 2018 (in thousands): Three Months Ended March 31, 2019 2018 Antidilutive securities: RSUs 599 — Stock options 32 —

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Income (Loss) Accumulated Other Comprehensive Income (Loss) (Tables) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Equity [Abstract]
Accumulated Other Comprehensive Income (Loss)	Accumulated Other Comprehensive Income (Loss) The components of Accumulated Other Comprehensive Income (Loss) are as follows (in thousands): Three Months Ended March 31, 2019 Foreign Unrealized Gain (Loss) Unrealized (Loss) Gain Other Comprehensive Loss from Unconsolidated Subsidiaries Accumulated Beginning balance $ (177,597 ) $ 14,374 $ (8,075 ) $ (3,652 ) $ (174,950 ) Pretax (loss) income (9,895 ) 15,593 — — 5,698 Income tax effect — (3,654 ) — — (3,654 ) Reclassification of unrealized (gain) loss — (19,188 ) 253 — (18,935 ) Reclassification of deferred income taxes — 4,512 (62 ) — 4,450 Other comprehensive loss from unconsolidated subsidiaries — — — (3,463 ) (3,463 ) Ending balance $ (187,492 ) $ 11,637 $ (7,884 ) $ (7,115 ) $ (190,854 ) Three Months Ended March 31, 2018 Foreign Unrealized Gain (Loss) Unrealized (Loss) Gain Other Comprehensive Loss from Unconsolidated Subsidiaries Accumulated Beginning balance $ (71,933 ) $ 11,538 $ (8,772 ) $ (1,309 ) $ (70,476 ) Pretax income (loss) 48,435 (4,501 ) (629 ) — 43,305 Income tax effect 50 1,053 8 — 1,111 Reclassification of unrealized loss — 8,747 — — 8,747 Reclassification of deferred income taxes — (2,045 ) — — (2,045 ) Other comprehensive loss from unconsolidated subsidiaries — — — (605 ) (605 ) Adoption of ASU 2018-02 2,859 2,486 — — 5,345 Ending balance $ (20,589 ) $ 17,278 $ (9,393 ) $ (1,914 ) $ (14,618 ) Net unrealized gains on our interest rate swaps, inclusive of our interest rate swap agreements and the interest rate swap component of our cross currency swaps, totaling $2 million were reclassified to Interest expense, net of interest income in our Unaudited Condensed Consolidated Statements of Income during each of the three months ended March 31, 2019 and 2018 . We also reclassified gains of $4 million and $1 million to Interest expense, net of interest income related to the foreign currency forward component of our cross currency swaps during the three months ended March 31, 2019 and 2018 , respectively. Also related to our cross currency swaps, we reclassified gains of $13 million and losses of $12 million to Other income, net in our Unaudited Condensed Consolidated Statements of Income during the three months ended March 31, 2019 and 2018 , respectively; these gains and losses offset the impact of the remeasurement of the underlying contracts. Net unrealized losses related to our pension plans were reclassified to Other income, net in our Unaudited Condensed Consolidated Statements of Income during the three months ended March 31, 2019. Our policy is to reclassify the income tax effect from Accumulated other comprehensive income (loss) to the Provision for income taxes when the related gains and losses are released to the Unaudited Condensed Consolidated Statements of Income. During the first quarter of 2018, we adopted ASU No. 2018-02, "Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income" ("ASU 2018-02"), which allowed a reclassification from Accumulated other comprehensive income (loss) to Retained earnings for stranded tax effects resulting from the reduction of the U.S. federal statutory income tax rate to 21% from 35% due to the enactment of the Tax Cuts and Jobs Act of 2017 (the "Tax Act"). As a result of the adoption of ASU 2018-02 in the first quarter of 2018, we recorded a $5 million reclassification to increase Accumulated other comprehensive income (loss) and decrease Retained earnings. The components of Accumulated Other Comprehensive Income (Loss) are as follows (in thousands): Three Months Ended March 31, 2019 Foreign Unrealized Gain (Loss) Unrealized (Loss) Gain Other Comprehensive Loss from Unconsolidated Subsidiaries Accumulated Beginning balance $ (177,597 ) $ 14,374 $ (8,075 ) $ (3,652 ) $ (174,950 ) Pretax (loss) income (9,895 ) 15,593 — — 5,698 Income tax effect — (3,654 ) — — (3,654 ) Reclassification of unrealized (gain) loss — (19,188 ) 253 — (18,935 ) Reclassification of deferred income taxes — 4,512 (62 ) — 4,450 Other comprehensive loss from unconsolidated subsidiaries — — — (3,463 ) (3,463 ) Ending balance $ (187,492 ) $ 11,637 $ (7,884 ) $ (7,115 ) $ (190,854 ) Three Months Ended March 31, 2018 Foreign Unrealized Gain (Loss) Unrealized (Loss) Gain Other Comprehensive Loss from Unconsolidated Subsidiaries Accumulated Beginning balance $ (71,933 ) $ 11,538 $ (8,772 ) $ (1,309 ) $ (70,476 ) Pretax income (loss) 48,435 (4,501 ) (629 ) — 43,305 Income tax effect 50 1,053 8 — 1,111 Reclassification of unrealized loss — 8,747 — — 8,747 Reclassification of deferred income taxes — (2,045 ) — — (2,045 ) Other comprehensive loss from unconsolidated subsidiaries — — — (605 ) (605 ) Adoption of ASU 2018-02 2,859 2,486 — — 5,345 Ending balance $ (20,589 ) $ 17,278 $ (9,393 ) $ (1,914 ) $ (14,618 )
Other Comprehensive Income (Loss), Tax	$ 3,654	$ (1,111)

Long-Term Obligations (Tables)

Long-Term Obligations (Tables)	3 Months Ended
	Mar. 31, 2019
Debt Disclosure [Abstract]
Schedule Of Long-Term Obligations	Long-term obligations consist of the following (in thousands): March 31, December 31, 2019 2018 Senior secured credit agreement: Term loans payable $ 347,813 $ 350,000 Revolving credit facilities 1,363,544 1,387,177 U.S. Notes (2023) 600,000 600,000 Euro Notes (2024) 560,900 573,350 Euro Notes (2026/28) 1,121,800 1,146,700 Receivables securitization facility 79,690 110,000 Notes payable through October 2030 at weighted average interest rates of 2.1% and 2.0%, respectively 21,701 23,056 Finance lease obligations 42,160 39,966 Other long-term debt at weighted average interest rate of 1.9% and 1.8%, respectively 126,540 117,448 Total debt 4,264,148 4,347,697 Less: long-term debt issuance costs (34,810 ) (36,906 ) Less: current debt issuance costs (289 ) (291 ) Total debt, net of debt issuance costs 4,229,049 4,310,500 Less: current maturities, net of debt issuance costs (136,283 ) (121,826 ) Long term debt, net of debt issuance costs $ 4,092,766 $ 4,188,674

Derivative Instruments and He_2

Derivative Instruments and Hedging Activities (Tables)	3 Months Ended
	Mar. 31, 2019
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]	The following tables present information about our financial assets and liabilities measured at fair value on a recurring basis and indicate the fair value hierarchy of the valuation inputs we utilized to determine such fair value as of March 31, 2019 and December 31, 2018 (in thousands): Balance as of March 31, 2019 Fair Value Measurements as of March 31, 2019 Level 1 Level 2 Level 3 Assets: Cash surrender value of life insurance $ 53,316 $ — $ 53,316 $ — Interest rate swaps 11,350 — 11,350 — Cross currency swap agreements 9,911 — 9,911 — Total Assets $ 74,577 $ — $ 74,577 $ — Liabilities: Contingent consideration liabilities $ 5,274 $ — $ — $ 5,274 Deferred compensation liabilities 56,493 — 56,493 — Cross currency swap agreements 29,586 — 29,586 — Total Liabilities $ 91,353 $ — $ 86,079 $ 5,274 Balance as of December 31, 2018 Fair Value Measurements as of December 31, 2018 Level 1 Level 2 Level 3 Assets: Cash surrender value of life insurance $ 47,649 $ — $ 47,649 $ — Interest rate swaps 14,967 — 14,967 — Cross currency swap agreements 7,880 — 7,880 — Total Assets $ 70,496 $ — $ 70,496 $ — Liabilities: Contingent consideration liabilities $ 5,209 $ — $ — $ 5,209 Deferred compensation liabilities 48,984 — 48,984 — Cross currency swap agreements 40,997 — 40,997 — Total Liabilities $ 95,190 $ — $ 89,981 $ 5,209
Schedule of Derivative Instruments [Table Text Block]	The following tables summarize the notional amounts and fair values of our designated cash flow hedges as of March 31, 2019 and December 31, 2018 (in thousands): Notional Amount Fair Value at March 31, 2019 (USD) March 31, 2019 Other Current Assets Other Assets Other Accrued Expenses Other Noncurrent Liabilities Interest rate swap agreements USD denominated $ 480,000 $ — $ 11,350 $ — $ — Cross currency swap agreements USD/euro $ 570,349 2,242 7,669 144 29,442 Total cash flow hedges $ 2,242 $ 19,019 $ 144 $ 29,442 Notional Amount Fair Value at December 31, 2018 (USD) December 31, 2018 Other Current Assets Other Assets Other Accrued Expenses Other Noncurrent Liabilities Interest rate swap agreements USD denominated $ 480,000 $ — $ 14,967 $ — $ — Cross currency swap agreements USD/euro $ 574,315 211 7,669 127 40,870 Total cash flow hedges $ 211 $ 22,636 $ 127 $ 40,870

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 2019
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]	The following tables present information about our financial assets and liabilities measured at fair value on a recurring basis and indicate the fair value hierarchy of the valuation inputs we utilized to determine such fair value as of March 31, 2019 and December 31, 2018 (in thousands): Balance as of March 31, 2019 Fair Value Measurements as of March 31, 2019 Level 1 Level 2 Level 3 Assets: Cash surrender value of life insurance $ 53,316 $ — $ 53,316 $ — Interest rate swaps 11,350 — 11,350 — Cross currency swap agreements 9,911 — 9,911 — Total Assets $ 74,577 $ — $ 74,577 $ — Liabilities: Contingent consideration liabilities $ 5,274 $ — $ — $ 5,274 Deferred compensation liabilities 56,493 — 56,493 — Cross currency swap agreements 29,586 — 29,586 — Total Liabilities $ 91,353 $ — $ 86,079 $ 5,274 Balance as of December 31, 2018 Fair Value Measurements as of December 31, 2018 Level 1 Level 2 Level 3 Assets: Cash surrender value of life insurance $ 47,649 $ — $ 47,649 $ — Interest rate swaps 14,967 — 14,967 — Cross currency swap agreements 7,880 — 7,880 — Total Assets $ 70,496 $ — $ 70,496 $ — Liabilities: Contingent consideration liabilities $ 5,209 $ — $ — $ 5,209 Deferred compensation liabilities 48,984 — 48,984 — Cross currency swap agreements 40,997 — 40,997 — Total Liabilities $ 95,190 $ — $ 89,981 $ 5,209

Leases (Tables)

Leases (Tables)	3 Months Ended
	Mar. 31, 2019
Schedule of Leases [Abstract]
Schedule of Lease Term, Discount Rate, and Supplemental Cash Flow Information [Table Text Block]	Other information related to leases was as follows: Lease Term and Discount Rate March 31, 2019 Weighted-average remaining lease term (years) Operating leases 9.8 Finance leases 8.8 Weighted-average discount rate Operating leases 5.4 % Finance leases 4.5 % Three Months Ended Supplemental cash flows information (in thousands) March 31, 2019 Cash paid for amounts included in the measurement of lease liabilities Operating cash flows from operating leases $ 73,976 Financing cash flows from finance leases 2,642 Leased assets obtained in exchange for new finance lease liabilities 5,245 Leased assets obtained in exchange for new operating lease liabilities 28,563
Schedule of Leases [Table Text Block]	The amounts recorded in the unaudited condensed consolidated balance sheet as of March 31, 2019 related to our lease agreements are as follows (in thousands): Leases Classification March 31, 2019 Assets Operating lease assets, net Operating lease assets, net $ 1,279,576 Finance lease assets, net Property, plant and equipment, net 42,311 Total leased assets $ 1,321,887 Liabilities Current Operating Current portion of operating lease liabilities $ 216,172 Finance Current portion of long-term obligations 10,658 Noncurrent Operating Long-term operating lease liabilities 1,109,814 Finance Long-term obligations, excluding current portion 31,502 Total lease liabilities $ 1,368,146
Schedule of Lease Cost [Table Text Block]	The components of lease expense are as follows (in thousands): Three Months Ended Lease Cost Classification March 31, 2019 Operating lease cost Cost of goods sold $ 3,835 Operating lease cost Selling, general and administrative expenses 73,282 Short-term lease cost Selling, general and administrative expenses 667 Variable lease cost Selling, general and administrative expenses 25,990 Finance lease cost Amortization of leased assets Depreciation and amortization 2,598 Interest on lease liabilities Interest expense, net of interest income 448 Sublease income Other income, net (275 ) Net lease cost $ 106,545
Schedule of Maturity of Operating Lease Liabilities [Table Text Block]	The future minimum lease commitments under our noncancelable operating leases at December 31, 2018 were as follows (in thousands): Years ending December 31: 2019 $ 294,269 2020 256,172 2021 210,632 2022 158,763 2023 131,518 Thereafter 777,165 Future Minimum Lease Payments $ 1,828,519
Schedule of Maturing of Finance Lease Liabilities [Table Text Block]	The future minimum lease commitments under our leases at March 31, 2019 are as follows (in thousands): Operating leases Finance leases (1) Total Nine months ending December 31, 2019 $ 222,074 $ 9,087 $ 231,161 Years ending December 31: 2020 265,133 10,705 275,838 2021 217,839 8,571 226,410 2022 166,904 6,214 173,118 2023 138,834 2,676 141,510 2024 115,318 2,210 117,528 Thereafter 704,382 16,481 720,863 Future minimum lease payments 1,830,484 55,944 1,886,428 Less: Interest 504,498 13,784 518,282 Present value of lease liabilities $ 1,325,986 $ 42,160 $ 1,368,146

Employee Benefit Plans (Tables)

Employee Benefit Plans (Tables)	3 Months Ended
	Mar. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Pension and Other Postretirement Benefits Disclosure [Text Block]	Employee Benefit Plans We have funded and unfunded defined benefit plans covering certain employee groups in the U.S. and various European countries. Local statutory requirements govern many of our European plans. The defined benefit plans are mostly closed to new participants and, in some cases, existing participants no longer accrue benefits. As of both March 31, 2019 and December 31, 2018 , the aggregate funded status of the defined benefit plans was a liability of $110 million , and is reported in Other noncurrent liabilities and Accrued payroll-related liabilities on our Unaudited Condensed Consolidated Balance Sheets. Net periodic benefit cost for our defined benefit plans included the following components for the three months ended March 31, 2019 and 2018 (in thousands): Three Months Ended March 31, 2019 2018 Service cost $ 587 $ 468 Interest cost 985 670 Expected return on plan assets (780 ) (717 ) Amortization of actuarial (gain) loss 253 — Net periodic benefit cost $ 1,045 $ 421 For the three months ended March 31, 2019 and 2018 , the service cost component of net periodic benefit cost was classified in Selling, general and administrative expenses, while the other components of net periodic benefit cost were classified in Other income, net in our Unaudited Condensed Consolidated Statements of Income.
Schedule of Net Benefit Costs [Table Text Block]	Net periodic benefit cost for our defined benefit plans included the following components for the three months ended March 31, 2019 and 2018 (in thousands): Three Months Ended March 31, 2019 2018 Service cost $ 587 $ 468 Interest cost 985 670 Expected return on plan assets (780 ) (717 ) Amortization of actuarial (gain) loss 253 — Net periodic benefit cost $ 1,045 $ 421

Segment and Geographic Inform_2

Segment and Geographic Information (Tables)	3 Months Ended
	Mar. 31, 2019
Segment Reporting [Abstract]
Schedule Of Financial Performance By Reportable Segment	The following tables present our financial performance by reportable segment for the periods indicated (in thousands): North America Europe Specialty Eliminations Consolidated Three Months Ended March 31, 2019 Revenue: Third Party $ 1,302,206 $ 1,445,541 $ 352,556 $ — $ 3,100,303 Intersegment 103 — 1,181 (1,284 ) — Total segment revenue $ 1,302,309 $ 1,445,541 $ 353,737 $ (1,284 ) $ 3,100,303 Segment EBITDA $ 176,636 $ 105,298 $ 37,959 $ — $ 319,893 Depreciation and amortization (1) 22,239 47,011 6,957 — 76,207 Three Months Ended March 31, 2018 Revenue: Third Party $ 1,329,660 $ 1,040,430 $ 350,674 $ — $ 2,720,764 Intersegment 183 — 1,118 (1,301 ) — Total segment revenue $ 1,329,843 $ 1,040,430 $ 351,792 $ (1,301 ) $ 2,720,764 Segment EBITDA $ 177,713 $ 75,534 $ 41,969 $ — $ 295,216 Depreciation and amortization (1) 21,228 32,757 7,081 — 61,066
Reconciliation Of Segment EBITDA To Net Income Table	The table below provides a reconciliation of Net Income to Segment EBITDA (in thousands): Three Months Ended March 31, 2019 2018 Net income $ 99,063 $ 152,763 Less: net income (loss) attributable to noncontrolling interest 1,015 (197 ) Net income attributable to LKQ stockholders 98,048 152,960 Add: Depreciation and amortization 71,002 56,458 Depreciation and amortization - cost of goods sold 5,205 4,608 Interest expense, net of interest income 36,089 28,515 Provision for income taxes 51,550 49,584 EBITDA 261,894 292,125 Subtract: Equity in (losses) earnings of unconsolidated subsidiaries (1) (39,549 ) 1,412 Add: Restructuring and acquisition related expenses (2) 3,307 4,054 Inventory step-up adjustment - acquisition related — 403 Impairment of net assets held for sale (3) 15,023 — Change in fair value of contingent consideration liabilities 120 46 Segment EBITDA $ 319,893 $ 295,216
Schedule Of Capital Expenditures By Reportable Segment	The following table presents capital expenditures by reportable segment (in thousands): Three Months Ended March 31, 2019 2018 Capital Expenditures North America $ 31,234 $ 29,662 Europe 19,577 28,815 Specialty 2,205 3,712 Total capital expenditures $ 53,016 $ 62,189
Schedule Of Assets By Reportable Segment	The following table presents assets by reportable segment (in thousands): March 31, December 31, 2019 2018 Receivables, net North America $ 445,056 $ 411,818 Europe 770,543 649,174 Specialty 137,892 93,091 Total receivables, net 1,353,491 1,154,083 Inventories North America 994,438 1,076,306 Europe 1,363,929 1,410,264 Specialty 333,639 349,505 Total inventories 2,692,006 2,836,075 Property, plant and equipment, net North America 574,046 570,508 Europe 546,725 562,600 Specialty 85,571 87,054 Total property, plant and equipment, net 1,206,342 1,220,162 Operating lease assets, net (1) North America 757,590 — Europe 438,272 — Specialty 83,714 — Total operating lease assets, net 1,279,576 — Equity method investments North America 17,551 16,404 Europe (2) 116,683 162,765 Total equity method investments 134,234 179,169 Other unallocated assets 6,000,261 6,003,913 Total assets $ 12,665,910 $ 11,393,402
Revenue from External Customers by Geographic Area	The following table sets forth our revenue by geographic area (in thousands): Three Months Ended March 31, 2019 2018 Revenue United States $ 1,542,026 $ 1,560,027 United Kingdom 412,813 430,992 Germany 386,465 803 Other countries 758,999 728,942 Total revenue $ 3,100,303 $ 2,720,764
Schedule Of Tangible Long-Lived Assets By Geographic Area	The following table sets forth our tangible long-lived assets by geographic area (in thousands): March 31, December 31, 2019 2018 Long-lived assets (1) United States $ 1,424,978 $ 620,125 Germany 305,442 217,476 United Kingdom 339,147 165,145 Other countries 416,351 217,416 Total long-lived assets $ 2,485,918 $ 1,220,162

Condensed Consolidating Finan_2

Condensed Consolidating Financial Information (Tables)	3 Months Ended		12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Condensed Consolidating Financial Information [Abstract]
Consolidated Condensed Statements of Income	LKQ CORPORATION AND SUBSIDIARIES Unaudited Condensed Consolidating Statements of Income (In thousands) For the Three Months Ended March 31, 2019 Parent Guarantors Non-Guarantors Eliminations Consolidated Revenue $ — $ 1,550,680 $ 1,586,877 $ (37,254 ) $ 3,100,303 Cost of goods sold — 921,489 1,007,804 (37,254 ) 1,892,039 Gross margin — 629,191 579,073 — 1,208,264 Selling, general and administrative expenses 9,038 432,387 455,107 — 896,532 Restructuring and acquisition related expenses — 606 2,701 — 3,307 Impairment of net assets held for sale — 8,461 6,562 — 15,023 Depreciation and amortization 54 25,073 45,875 — 71,002 Operating (loss) income (9,092 ) 162,664 68,828 — 222,400 Other expense (income): Interest expense (income), net of interest income 13,836 (336 ) 22,589 — 36,089 Intercompany interest (income) expense, net (15,086 ) 9,189 5,897 — — Other expense (income), net 19 (7,831 ) 3,961 — (3,851 ) Total other (income) expense, net (1,231 ) 1,022 32,447 — 32,238 (Loss) income before (benefit) provision for income taxes (7,861 ) 161,642 36,381 — 190,162 (Benefit) provision for income taxes (2,046 ) 43,303 10,293 — 51,550 Equity in earnings (losses) of unconsolidated subsidiaries — 1,147 (40,696 ) — (39,549 ) Equity in earnings of subsidiaries 103,863 9,712 — (113,575 ) — Net income (loss) 98,048 129,198 (14,608 ) (113,575 ) 99,063 Less: net income attributable to noncontrolling interest — — 1,015 — 1,015 Net income (loss) attributable to LKQ stockholders $ 98,048 $ 129,198 $ (15,623 ) $ (113,575 ) $ 98,048	LKQ CORPORATION AND SUBSIDIARIES Unaudited Condensed Consolidating Statements of Income (In thousands) For the Three Months Ended March 31, 2018 Parent Guarantors Non-Guarantors Eliminations Consolidated Revenue $ — $ 1,577,595 $ 1,180,242 $ (37,073 ) $ 2,720,764 Cost of goods sold — 945,915 757,951 (37,073 ) 1,666,793 Gross margin — 631,680 422,291 — 1,053,971 Selling, general and administrative expenses 9,130 426,797 330,964 — 766,891 Restructuring and acquisition related expenses — 330 3,724 — 4,054 Depreciation and amortization 29 24,338 32,091 — 56,458 Operating (loss) income (9,159 ) 180,215 55,512 — 226,568 Other expense (income): Interest expense, net of interest income 18,008 212 10,295 — 28,515 Intercompany interest (income) expense, net (15,400 ) 9,680 5,720 — — Other (income) expense, net (1,015 ) (5,882 ) 4,015 — (2,882 ) Total other expense, net 1,593 4,010 20,030 — 25,633 (Loss) income before (benefit) provision for income taxes (10,752 ) 176,205 35,482 — 200,935 (Benefit) provision for income taxes (3,904 ) 45,877 7,611 — 49,584 Equity in earnings of unconsolidated subsidiaries — — 1,412 — 1,412 Equity in earnings of subsidiaries 159,808 5,110 — (164,918 ) — Net income 152,960 135,438 29,283 (164,918 ) 152,763 Less: net loss attributable to noncontrolling interest — — (197 ) — (197 ) Net income attributable to LKQ stockholders $ 152,960 $ 135,438 $ 29,480 $ (164,918 ) $ 152,960
Consolidated Condensed Statements of Comprehensive Income (Loss)	LKQ CORPORATION AND SUBSIDIARIES Unaudited Condensed Consolidating Statements of Comprehensive Income (In thousands) For the Three Months Ended March 31, 2019 Parent Guarantors Non-Guarantors Eliminations Consolidated Net income (loss) $ 98,048 $ 129,198 $ (14,608 ) $ (113,575 ) $ 99,063 Less: net income attributable to noncontrolling interest — — 1,015 — 1,015 Net income (loss) attributable to LKQ stockholders 98,048 129,198 (15,623 ) (113,575 ) 98,048 Other comprehensive income (loss): Foreign currency translation, net of tax (9,895 ) 2,194 (10,466 ) 8,272 (9,895 ) Net change in unrealized gains/losses on cash flow hedges, net of tax (2,737 ) — — — (2,737 ) Net change in unrealized gains/losses on pension plans, net of tax 191 (4 ) 195 (191 ) 191 Net change in other comprehensive loss from unconsolidated subsidiaries (3,463 ) — (3,463 ) 3,463 (3,463 ) Other comprehensive (loss) income (15,904 ) 2,190 (13,734 ) 11,544 (15,904 ) Comprehensive income (loss) 82,144 131,388 (28,342 ) (102,031 ) 83,159 Less: comprehensive income attributable to noncontrolling interest — — 1,015 — 1,015 Comprehensive income (loss) attributable to LKQ stockholders $ 82,144 $ 131,388 $ (29,357 ) $ (102,031 ) $ 82,144	LKQ CORPORATION AND SUBSIDIARIES Unaudited Condensed Consolidating Statements of Comprehensive Income (In thousands) For the Three Months Ended March 31, 2018 Parent Guarantors Non-Guarantors Eliminations Consolidated Net income $ 152,960 $ 135,438 $ 29,283 $ (164,918 ) $ 152,763 Less: net loss attributable to noncontrolling interest — — (197 ) — (197 ) Net income attributable to LKQ stockholders 152,960 135,438 29,480 (164,918 ) 152,960 Other comprehensive income (loss): Foreign currency translation, net of tax 48,485 (2,183 ) 49,055 (46,872 ) 48,485 Net change in unrealized gains/losses on cash flow hedges, net of tax 3,254 — — — 3,254 Net change in unrealized gains/losses on pension plans, net of tax (621 ) (621 ) — 621 (621 ) Net change in other comprehensive loss from unconsolidated subsidiaries (605 ) — (605 ) 605 (605 ) Other comprehensive income (loss) 50,513 (2,804 ) 48,450 (45,646 ) 50,513 Comprehensive income 203,473 132,634 77,733 (210,564 ) 203,276 Less: comprehensive loss attributable to noncontrolling interest — — (197 ) — (197 ) Comprehensive income attributable to LKQ stockholders $ 203,473 $ 132,634 $ 77,930 $ (210,564 ) $ 203,473
Consolidated Condensed Balance Sheets	LKQ CORPORATION AND SUBSIDIARIES Unaudited Condensed Consolidating Balance Sheets (In thousands) March 31, 2019 Parent Guarantors Non-Guarantors Eliminations Consolidated Assets Current assets: Cash and cash equivalents $ 40,703 $ 31,744 $ 243,619 $ — $ 316,066 Receivables, net 386 366,235 986,870 — 1,353,491 Intercompany receivables, net 7,411 — 19,147 (26,558 ) — Inventories — 1,245,544 1,446,462 — 2,692,006 Prepaid expenses and other current assets 4,668 162,616 115,923 — 283,207 Total current assets 53,168 1,806,139 2,812,021 (26,558 ) 4,644,770 Property, plant and equipment, net 1,630 600,965 603,747 — 1,206,342 Operating lease assets, net 3,857 801,420 474,299 — 1,279,576 Intangible assets: Goodwill — 1,973,101 2,381,205 — 4,354,306 Other intangibles, net 234 260,491 628,884 — 889,609 Investment in subsidiaries 5,288,058 123,496 — (5,411,554 ) — Intercompany notes receivable 1,183,505 51,118 — (1,234,623 ) — Equity method investments — 17,551 116,683 — 134,234 Other assets 72,335 40,183 44,555 — 157,073 Total assets $ 6,602,787 $ 5,674,464 $ 7,061,394 $ (6,672,735 ) $ 12,665,910 Liabilities and Stockholders’ Equity Current liabilities: Accounts payable $ 2,111 $ 339,448 $ 611,129 $ — $ 952,688 Intercompany payables, net — 19,147 7,411 (26,558 ) — Accrued expenses: Accrued payroll-related liabilities 4,967 33,658 104,401 — 143,026 Other accrued expenses 12,930 105,465 199,431 — 317,826 Refund liability — 51,082 54,353 — 105,435 Other current liabilities 16,590 22,596 60,872 — 100,058 Current portion of operating lease liabilities 204 116,053 99,915 — 216,172 Current portion of long-term obligations 10,649 3,326 122,308 — 136,283 Total current liabilities 47,451 690,775 1,259,820 (26,558 ) 1,971,488 Long-term operating lease liabilities, excluding current portion 4,054 712,259 393,501 — 1,109,814 Long-term obligations, excluding current portion 1,624,269 16,248 2,452,249 — 4,092,766 Intercompany notes payable — 577,301 657,322 (1,234,623 ) — Deferred income taxes 7,187 135,287 163,296 — 305,770 Other noncurrent liabilities 120,344 75,446 133,508 — 329,298 Stockholders' equity: Total Company stockholders’ equity 4,799,482 3,467,148 1,944,406 (5,411,554 ) 4,799,482 Noncontrolling interest — — 57,292 — 57,292 Total stockholders’ equity 4,799,482 3,467,148 2,001,698 (5,411,554 ) 4,856,774 Total liabilities and stockholders' equity $ 6,602,787 $ 5,674,464 $ 7,061,394 $ (6,672,735 ) $ 12,665,910		LKQ CORPORATION AND SUBSIDIARIES Unaudited Condensed Consolidating Balance Sheets (In thousands) December 31, 2018 Parent Guarantors Non-Guarantors Eliminations Consolidated Assets Current assets: Cash and cash equivalents $ 25,633 $ 29,285 $ 276,843 $ — $ 331,761 Receivables, net 310 316,726 837,047 — 1,154,083 Intercompany receivables, net 6,978 — 12,880 (19,858 ) — Inventories — 1,343,612 1,492,463 — 2,836,075 Prepaid expenses and other current assets 18,611 99,356 81,063 — 199,030 Total current assets 51,532 1,788,979 2,700,296 (19,858 ) 4,520,949 Property, plant and equipment, net 1,547 600,054 618,561 — 1,220,162 Intangible assets: Goodwill — 1,973,364 2,408,094 — 4,381,458 Other intangibles, net 260 272,451 656,041 — 928,752 Investment in subsidiaries 5,224,006 111,826 — (5,335,832 ) — Intercompany notes receivable 1,220,582 10,515 — (1,231,097 ) — Equity method investments — 16,404 162,765 — 179,169 Other assets 70,283 40,548 52,081 — 162,912 Total assets $ 6,568,210 $ 4,814,141 $ 6,597,838 $ (6,586,787 ) $ 11,393,402 Liabilities and Stockholders’ Equity Current liabilities: Accounts payable $ 2,454 $ 343,116 $ 596,828 $ — $ 942,398 Intercompany payables, net — 12,880 6,978 (19,858 ) — Accrued expenses: Accrued payroll-related liabilities 6,652 70,267 95,086 — 172,005 Other accrued expenses 5,454 105,672 177,299 — 288,425 Refund liability — 50,899 53,686 — 104,585 Other current liabilities 283 17,860 42,966 — 61,109 Current portion of long-term obligations 8,459 2,932 110,435 — 121,826 Total current liabilities 23,302 603,626 1,083,278 (19,858 ) 1,690,348 Long-term obligations, excluding current portion 1,628,677 13,532 2,546,465 — 4,188,674 Intercompany notes payable — 597,283 633,814 (1,231,097 ) — Deferred income taxes 8,045 135,355 168,034 — 311,434 Other noncurrent liabilities 125,888 99,147 139,159 — 364,194 Stockholders' equity: Total Company stockholders’ equity 4,782,298 3,365,198 1,970,634 (5,335,832 ) 4,782,298 Noncontrolling interest — — 56,454 — 56,454 Total stockholders’ equity 4,782,298 3,365,198 2,027,088 (5,335,832 ) 4,838,752 Total liabilities and stockholders' equity $ 6,568,210 $ 4,814,141 $ 6,597,838 $ (6,586,787 ) $ 11,393,402
Consolidated Condensed Statements of Cash Flows	LKQ CORPORATION AND SUBSIDIARIES Unaudited Condensed Consolidating Statements of Cash Flows (In thousands) For the Three Months Ended March 31, 2019 Parent Guarantors Non-Guarantors (1) Eliminations Consolidated CASH FLOWS FROM OPERATING ACTIVITIES: Net cash provided by operating activities $ 65,970 $ 9,150 $ 54,335 $ 47,770 $ 177,225 CASH FLOWS FROM INVESTING ACTIVITIES: Purchases of property, plant and equipment (438 ) (30,128 ) (22,450 ) — (53,016 ) Investment and intercompany note activity with subsidiaries 23,342 — — (23,342 ) — Acquisitions, net of cash acquired — (152 ) (4,633 ) — (4,785 ) Receipts of deferred purchase price on receivables under factoring arrangements — 75,123 — (75,123 ) — Other investing activities, net — 89 (72 ) — 17 Net cash provided by (used in) investing activities 22,904 44,932 (27,155 ) (98,465 ) (57,784 ) CASH FLOWS FROM FINANCING ACTIVITIES: Proceeds from exercise of stock options 1,334 — — — 1,334 Taxes paid related to net share settlements of stock-based compensation awards (1,505 ) — — — (1,505 ) Purchase of treasury stock (70,462 ) — — — (70,462 ) Borrowings under revolving credit facilities 194,000 — 90,641 — 284,641 Repayments under revolving credit facilities (194,966 ) — (117,373 ) — (312,339 ) Repayments under term loans (2,188 ) — — — (2,188 ) Borrowings under receivables securitization facility — — 6,600 — 6,600 Repayments under receivables securitization facility — — (36,910 ) — (36,910 ) Borrowings (repayments) of other debt, net — 763 (1,388 ) — (625 ) Other financing activities, net (17 ) — (1,260 ) — (1,277 ) Investment and intercompany note activity with parent — (25,502 ) 2,160 23,342 — Dividends — (27,353 ) — 27,353 — Net cash used in financing activities (73,804 ) (52,092 ) (57,530 ) 50,695 (132,731 ) Effect of exchange rate changes on cash, cash equivalents and restricted cash — 469 (2,982 ) — (2,513 ) Net increase (decrease) in cash, cash equivalents and restricted cash 15,070 2,459 (33,332 ) — (15,803 ) Cash, cash equivalents and restricted cash, beginning of period 25,633 29,285 282,332 — 337,250 Cash, cash equivalents and restricted cash, end of period $ 40,703 $ 31,744 $ 249,000 $ — $ 321,447	LKQ CORPORATION AND SUBSIDIARIES Unaudited Condensed Consolidating Statements of Cash Flows (In thousands) For the Three Months Ended March 31, 2018 Parent Guarantors Non-Guarantors Eliminations Consolidated CASH FLOWS FROM OPERATING ACTIVITIES: Net cash provided by operating activities $ 95,942 $ 35,802 $ 243 $ 13,176 $ 145,163 CASH FLOWS FROM INVESTING ACTIVITIES: Purchases of property, plant and equipment (163 ) (29,908 ) (32,118 ) — (62,189 ) Investment and intercompany note activity with subsidiaries 24,333 — — (24,333 ) — Acquisitions, net of cash acquired — (2,966 ) — — (2,966 ) Receipts of deferred purchase price on receivables under factoring arrangements (1) — 68,171 — (68,171 ) — Other investing activities, net — (145 ) 679 — 534 Net cash provided by (used in) investing activities 24,170 35,152 (31,439 ) (92,504 ) (64,621 ) CASH FLOWS FROM FINANCING ACTIVITIES: Proceeds from exercise of stock options 2,255 — — — 2,255 Taxes paid related to net share settlements of stock-based compensation awards (3,292 ) — — — (3,292 ) Borrowings under revolving credit facilities 161,000 — 40,669 — 201,669 Repayments under revolving credit facilities (291,966 ) — (29,559 ) — (321,525 ) Repayments under term loans (4,405 ) — — — (4,405 ) (Repayments) borrowings of other debt, net — (30 ) 4,439 — 4,409 Other financing activities, net (724 ) — 4,107 — 3,383 Investment and intercompany note activity with parent — (21,759 ) (2,574 ) 24,333 — Dividends — (54,995 ) — 54,995 — Net cash (used in) provided by financing activities (137,132 ) (76,784 ) 17,082 79,328 (117,506 ) Effect of exchange rate changes on cash and cash equivalents — (326 ) 3,203 — 2,877 Net decrease in cash and cash equivalents (17,020 ) (6,156 ) (10,911 ) — (34,087 ) Cash and cash equivalents, beginning of period 34,360 35,131 210,275 — 279,766 Cash and cash equivalents, end of period $ 17,340 $ 28,975 $ 199,364 $ — $ 245,679

Business Combinations - Additio

Business Combinations - Additional Information (Details) $ in Thousands, € in Millions	3 Months Ended			6 Months Ended		12 Months Ended	15 Months Ended
	Mar. 31, 2019USD ($)	Jun. 30, 2018USD ($)	Mar. 31, 2018USD ($)	Jun. 30, 2018USD ($)shares	Jun. 30, 2018EUR (€)shares	Dec. 31, 2018USD ($)	Mar. 31, 2019USD ($)	Jun. 30, 2018EUR (€)	Apr. 09, 2018USD ($)
Business Acquisition
Total acquisition date fair value of the consideration for acquisitions	$ 7,000
Gains on bargain purchases						$ 2,418
Cash used in acquisitions, net of cash acquired	4,785		$ 2,966			1,214,995
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Debt	7,000						$ 7,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities						11,347
Business Acquisition Cost Of Acquired Entity Other Purchase Price Obligations Non Interest Bearing						2,461
Revenue	3,100,303		2,720,764
Operating income	222,400		226,568
Contingent consideration liabilities						(3,107)
Warn Industries [Member]
Business Acquisition
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles						5,000
2017 Acquisitions Excluding Warn [Member]
Business Acquisition
Business Acquisition Cost Of Acquired Entity Other Purchase Price Obligations Non Interest Bearing, Post Purchase Adjustment						(4,000)
Stahlgruber [Member]
Business Acquisition
Business Acquisition, Effective Date of Acquisition		May 30, 2018
Total acquisition date fair value of the consideration for acquisitions				$ 1,400,000	€ 1,200
Gains on bargain purchases						0
Cash used in acquisitions, net of cash acquired				1,100,000	€ 1,000	1,127,446
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned		$ 251,000		$ 251,000				€ 215
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities						0
Business Acquisition Cost Of Acquired Entity Other Purchase Price Obligations Non Interest Bearing						6,084
Debt Instrument, Face Amount									$ 1,200,000
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | shares				8,055,569	8,055,569
Contingent consideration liabilities						0
Goodwill, Purchase Accounting Adjustments	$ (5,000)					(908,000)	$ (913,000)
All 2018 Acquisitions excluding Stahlgruber [Member]
Business Acquisition
Total acquisition date fair value of the consideration for acquisitions						99,000
Cash used in acquisitions, net of cash acquired						85,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities						11,000
Goodwill, Acquired During Period						$ 68,000
Wholesale - NA [Member]
Business Acquisition
Number of acquisitions						4
Wholesale Europe [Member]
Business Acquisition
Number of acquisitions	2					9
Payment To Former Owners [Member] | All 2018 Acquisitions excluding Stahlgruber [Member]
Business Acquisition
Contingent consideration liabilities						$ (3,000)
Payment To Former Owners [Member] | Maximum | All 2018 Acquisitions excluding Stahlgruber [Member]
Business Acquisition
Contingent consideration liabilities						$ (5,000)
Specialty
Business Acquisition
Revenue	$ 353,737		$ 351,792

Purchase Price Allocations for

Purchase Price Allocations for Acquisitions (Details) $ in Thousands, € in Billions	3 Months Ended		6 Months Ended		12 Months Ended
	Mar. 31, 2019USD ($)	Mar. 31, 2018USD ($)	Jun. 30, 2018USD ($)	Jun. 30, 2018EUR (€)	Dec. 31, 2018USD ($)
Business Acquisition
Receivables					$ 163,997
Receivable reserves					(3,736)
Inventories					394,259
Prepaid expenses and other current assets					12,821
Property, plant and equipment					277,003
Goodwill	$ 4,354,306				4,381,458
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill					320,414
Other assets					16,662
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities					(83,415)
Current liabilities assumed					(366,904)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt					(84,800)
Other noncurrent liabilities assumed					(91,130)
Consolidation, Less Than Wholly Owned Subsidiary, Non Controlling Interest Acquired, Value					(44,110)
Contingent consideration liabilities					(3,107)
Other purchase price obligations					(2,461)
Stock Issued During Period, Value, Acquisitions					(251,334)
Notes issued					(11,347)
Gains on bargain purchases					(2,418)
Settlement of other purchase price obligations (non-interest bearing)					1,711
Cash used in acquisitions, net of cash acquired	$ 4,785	$ 2,966			1,214,995
Warn Industries [Member]
Business Acquisition
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles					5,000
2017 Acquisitions Excluding Warn [Member]
Business Acquisition
Business Acquisition Cost Of Acquired Entity Other Purchase Price Obligations Non Interest Bearing, Post Purchase Adjustment					(4,000)
Stahlgruber [Member]
Business Acquisition
Receivables					144,826
Receivable reserves					(2,818)
Inventories					380,238
Prepaid expenses and other current assets					10,970
Property, plant and equipment					271,292
Goodwill					908,253
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill					285,255
Other assets					16,625
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities					(78,130)
Current liabilities assumed					(346,788)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt					(79,925)
Other noncurrent liabilities assumed					(80,824)
Consolidation, Less Than Wholly Owned Subsidiary, Non Controlling Interest Acquired, Value					(44,110)
Contingent consideration liabilities					0
Other purchase price obligations					(6,084)
Stock Issued During Period, Value, Acquisitions					(251,334)
Notes issued					0
Gains on bargain purchases					0
Settlement of other purchase price obligations (non-interest bearing)					0
Cash used in acquisitions, net of cash acquired			$ 1,100,000	€ 1	1,127,446
Defined Benefit Plan, Benefit Obligation, Business Combination					79,000
All 2018 Acquisitions and adjustments to 2017 acquisitions excluding Stahlgruber
Business Acquisition
Receivables					19,171
Receivable reserves					(918)
Inventories					14,021
Prepaid expenses and other current assets					1,851
Property, plant and equipment					5,711
Goodwill					64,637
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill					35,159
Other assets					37
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities					(5,285)
Current liabilities assumed					(20,116)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt					(4,875)
Other noncurrent liabilities assumed					(10,306)
Consolidation, Less Than Wholly Owned Subsidiary, Non Controlling Interest Acquired, Value					0
Contingent consideration liabilities					(3,107)
Other purchase price obligations					3,623
Stock Issued During Period, Value, Acquisitions					0
Notes issued					(11,347)
Gains on bargain purchases					(2,418)
Settlement of other purchase price obligations (non-interest bearing)					1,711
Cash used in acquisitions, net of cash acquired					87,549
All 2018 and 2017 Acquisitions [Member]
Business Acquisition
Goodwill					$ 972,890

Pro Forma Effect of Businesses

Pro Forma Effect of Businesses Acquired (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Business Acquisition
Revenue, as reported	$ 3,100,303	$ 2,720,764
Income from continuing operations	99,063
Less: net income (loss) attributable to noncontrolling interest	1,015	(197)
Net income	99,063	152,763
All Completed Acquisitions [Member]
Business Acquisition
Acquisition Related Costs, Net of Tax	224	1,526
Pro Forma [Member]
Business Acquisition
Revenue, as reported	3,106,283	3,253,303
Income from continuing operations	102,691	155,896
Income (Loss) from Continuing Operations, Net of Tax, Excluding Portion Attributable to Noncontrolling Interest	101,676	155,565
Pro Forma [Member] | Stahlgruber [Member]
Business Acquisition
Revenue, as reported	0	489,534
Income from continuing operations	3,074	1,273
Pro Forma [Member] | All 2019 Acquisitions [Member]
Business Acquisition
Revenue, as reported	5,980
Pro Forma [Member] | All 2019 and 2018 acquisitions excluding Stahlgruber [Member]
Business Acquisition
Revenue, as reported		43,005
Income from continuing operations	330	334
Business Acquisition Pro Forma Net Income attributable to noncontrolling interest	$ 0	$ 528

Financial Statement Informati_4

Financial Statement Information - Additional Information (Details) $ in Thousands	Dec. 01, 2016USD ($)	Mar. 31, 2019USD ($)shares	Dec. 31, 2018USD ($)shares	Jun. 30, 2018SEK (kr)	Jun. 30, 2018USD ($)	Mar. 31, 2018USD ($)	Mar. 31, 2019USD ($)	Dec. 31, 2018USD ($)shares	Dec. 31, 2017	Mar. 31, 2019SEK (kr)shares	Mar. 31, 2019USD ($)shares	Jan. 01, 2019USD ($)
Summary of Significant Accounting Policies [Line Items]
Contract with Customer, Refund Liability			$ 105,000					$ 105,000			$ 105,000
Net Inventory Held-for-Sale											62,000
Goodwill			4,381,458					4,381,458			4,354,306
Other intangibles, net			928,752					928,752			889,609
Restricted cash included in Other assets						$ 0					5,381
Accounts, Notes, Loans and Financing Receivable, Gross, Allowance, and Net [Abstract]
Reserve for uncollectible accounts			57,000					57,000			55,000
Inventory Disclosure [Abstract]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory			394,259					394,259
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures [Abstract]
Equity method investments			179,169					179,169			134,234
Derivative Asset, Noncurrent			22,636					$ 22,636			$ 19,019
Equity in (losses) earnings of unconsolidated subsidiaries		$ 39,549				(1,412)
Share Price of the Equity Method Investment | kr										kr 65
Effective Income Tax Rate Reconciliation, Amount [Abstract]
U.S. federal statutory rate								21.00%	35.00%
Adoption of ASU 2018-02 (see Note 8)						5,345
Stock Repurchase Program, Authorized Amount			$ 500,000					$ 500,000
Stock Repurchased During Period, Shares | shares		2,600,000						2,300,000
Treasury Stock, Common, Shares | shares			2,271,707					2,271,707		4,915,031	4,915,031
Payments for Repurchase of Common Stock		$ (70,462)				0		$ (60,000)
Stock Repurchase Program Remaining Authorized Repurchases, Amount											$ 370,000
Impairment of net assets held for sale		15,023				0
Disposal Group, Including Discontinued Operation, Assets											88,000
Net Liabilities Held-for-Sale											8,000
Contract with Customer, Right to Recover Product			$ 56,000					$ 56,000			$ 56,000
Disposal Group, Including Discontinued Operation, Revenue							$ 170,000
Mekonomen [Member]
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures [Abstract]
Equity Method Investment, Ownership Percentage			26.60%					26.60%
Revolving Credit Facility [Member]
Summary of Significant Accounting Policies [Line Items]
Weighted average interest rates			1.90%					1.90%		1.80%	1.80%
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Outstanding letters of credit											$ 65,000
Line of Credit Facility, Remaining Borrowing Capacity											1,700,000
ManufacturedProducts [Member]
Inventory Disclosure [Abstract]
Inventory, Raw Materials and Supplies, Gross			$ 17,000					$ 17,000			17,000
Inventory, Work in Process, Gross			2,000					2,000			2,000
Inventory, Finished Goods, Gross			4,000					4,000			6,000
Stahlgruber [Member]
Summary of Significant Accounting Policies [Line Items]
Goodwill			908,253					908,253
Inventory Disclosure [Abstract]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory			380,238					380,238
Warn Industries [Member]
Summary of Significant Accounting Policies [Line Items]
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles								5,000
Mekonomen [Member]
Summary of Significant Accounting Policies [Line Items]
Equity Method Investments, Fair Value Disclosure											110,000
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures [Abstract]
Equity Method Investment, Additional Information	December 1, 2016
Equity Method Investment, Ownership Percentage	26.50%
Investments in unconsolidated subsidiaries	$ 181,000		48,000
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity											5,000
Equity in (losses) earnings of unconsolidated subsidiaries		$ 40,000				(2,000)
Proceeds from Equity Method Investment, Distribution				kr 67,000,000	$ 8,000
Accumulated Other Comprehensive Income (Loss)
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Adoption of ASU 2018-02 (see Note 8)						$ 5,345
Increase to total leased assets [Member]
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Adoption of ASU 2016-02												$ 1,300,000
Increase to total liabilities [Member]
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Adoption of ASU 2016-02												$ 1,300,000
Europe
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures [Abstract]
Equity method investments			$ 162,765					$ 162,765			116,683
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Disposal Group, Including Discontinued Operation, Goodwill											$ (5,000)

Financial Statement Informati_5

Financial Statement Information Schedule of Inventory (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Product Information
Inventories		$ 394,259
Inventories	$ 2,692,006	2,836,075
Aftermarket and refurbished products
Product Information
Inventories	2,229,681	2,309,458
Salvage and remanufactured products
Product Information
Inventories	437,463	503,199
ManufacturedProducts [Member]
Accounting Policies [Abstract]
Inventory, Raw Materials, Gross	17,000	17,000
Inventory, Work in Process, Gross	2,000	2,000
Inventory, Finished Goods, Gross	6,000	4,000
Product Information
Inventories	$ 24,862	$ 23,418

Changes in Carrying Amount of G

Changes in Carrying Amount of Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Mar. 31, 2019
Goodwill [Roll Forward]
Ending balance	$ 4,381,458
Europe
Goodwill [Roll Forward]
Disposal Group, Including Discontinued Operation, Goodwill		$ (5,000)
Stahlgruber [Member]
Goodwill [Roll Forward]
Ending balance	$ 908,253

Components of Other Intangibles

Components of Other Intangibles (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Mar. 31, 2019
Finite-Lived Intangible Assets
Other intangibles, net	$ 928,752	$ 889,609
Warn Industries [Member]
Finite-Lived Intangible Assets
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles	$ 5,000

Changes in Warranty Reserve (De

Changes in Warranty Reserve (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019USD ($)
Warranty Reserve [Roll Forward]
Beginning balance	$ 23,262
Warranty expense	14,202
Warranty claims	(12,499)
Ending balance	$ 24,965

Financial Statement Informati_6

Financial Statement Information Schedule of New Accounting Pronouncements (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Income Statement Related Disclosures [Abstract]
Receivables, Net, Current	$ 1,353,491	$ 1,154,083
Prepaid Expense and Other Assets, Current	283,207	199,030
Other assets	157,073	162,912
Other current liabilities	100,058	61,109
Deferred Income Taxes	$ (305,770)	$ (311,434)

Financial Statement Informati_7

Financial Statement Information Equity Method Investments (Details) - USD ($) $ in Thousands	Dec. 01, 2016	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Other than Temporary Impairment		$ 39,551		$ 0
Equity in (losses) earnings of unconsolidated subsidiaries		39,549		(1,412)
Mekonomen [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Other than Temporary Impairment		40,000
Payments to Acquire Equity Method Investments	$ 181,000		$ 48,000
Equity in (losses) earnings of unconsolidated subsidiaries		$ 40,000		$ (2,000)
Equity Method Investment, Additional Information	December 1, 2016
Equity Method Investment, Ownership Percentage	26.50%
Mekonomen [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage			26.60%

Revenue Recognition Disaggreg_2

Revenue Recognition Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Revenue Recognition [Line Items]
Revenue	$ 3,100,303	$ 2,720,764
Contract with Customer, Refund Liability	105,000		$ 105,000
Contract with Customer, Right to Recover Product	56,000		56,000
Revenue, Variable Consideration Reserve	66,000		$ 103,000
North America
Revenue Recognition [Line Items]
Revenue	1,302,309	1,329,843
Europe
Revenue Recognition [Line Items]
Revenue	1,445,541	1,040,430
Specialty
Revenue Recognition [Line Items]
Revenue	353,737	351,792
Parts and Services
Revenue Recognition [Line Items]
Revenue	2,949,095	2,560,305
Parts and Services | North America
Revenue Recognition [Line Items]
Revenue	1,155,698	1,172,585
Parts and Services | Europe
Revenue Recognition [Line Items]
Revenue	1,440,841	1,037,046
Parts and Services | Specialty
Revenue Recognition [Line Items]
Revenue	352,556	350,674
Other Revenue
Revenue Recognition [Line Items]
Revenue	$ 151,208	$ 160,459

Revenue Recognition Movement in

Revenue Recognition Movement in Standard Product Warranty Accrual (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Product Warranty Liability [Line Items]
Contract with Customer, Right to Recover Product	$ 56,000	$ 56,000
Contract with Customer, Refund Liability	105,000	105,000
Revenue, Variable Consideration Reserve	66,000	103,000
Deferred Service-Type Warranty Revenue	25,511	$ 24,006
Deferred Revenue, Additions	10,875
Deferred Revenue, Revenue Recognized	$ (9,370)
Minimum
Product Warranty Liability [Line Items]
Standard Product Warranty Period	6 months
Maximum
Product Warranty Liability [Line Items]
Standard Product Warranty Period	36 months

Restructuring and Acquisition_2

Restructuring and Acquisition Related Expenses - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Acquisition Related Expenses [Abstract]
Business Combination, Acquisition Related Costs		$ 2
Acquisition And Restructuring Integration Plans [Abstract]
Restructuring Costs	$ 3	2
Stahlgruber [Member]
Acquisition Related Expenses [Abstract]
Business Combination, Acquisition Related Costs		1
Andrew Page
Acquisition And Restructuring Integration Plans [Abstract]
Restructuring Costs	2	$ 2
Maximum
Acquisition And Restructuring Integration Plans [Abstract]
Expected future restructuring expenses	$ (20)

Equity Incentive Plans - Additi

Equity Incentive Plans - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award
Stock-based compensation expense	$ 5,673	$ 5,982
Stock Options [Abstract]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options	$ 55,000
Performance Based RSU [Member]
Share-based Compensation Arrangement by Share-based Payment Award
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Performance Period	3 years
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	116,094		0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value	$ 27.69		$ 0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 27.69
RSUs [Abstract]
RSUs granted, shares	116,094
Stock Options [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Expected To Vest, Number	116,094
lkq_expected_to_vest_other_than_options_weighted_average_per_share	$ 27.69
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms	2 years 280 days
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested	$ 3,295
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	1,949,605		1,475,682
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value	$ 32.11		$ 34.94
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 27.69
RSUs [Abstract]
RSUs granted, shares	832,974
Fair value of RSUs vested during the period	$ 9,000
Stock Options [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Expected To Vest, Number	1,737,948
lkq_expected_to_vest_other_than_options_weighted_average_per_share	$ 32.12
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms	3 years 30 days
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested	$ 49,323
Stock options
Stock Options [Abstract]
Options granted during the period	0
Options vested during the period	0
Minimum | Stock options
Stock Options [Abstract]
Stock options expiration period	6 years
Maximum | Restricted Stock Units (RSUs) [Member]
Stock Options [Abstract]
Vesting period	5 years
Maximum | Performance Shares [Member]
RSUs [Abstract]
Reporting period of positive diluted earnings per share	5 years
Maximum | Stock options
Stock Options [Abstract]
Stock options expiration period	10 years
Vesting period	5 years

Stock-Based Compensation Schedu

Stock-Based Compensation Schedule of Unvested Restricted Stock Units Activity (Details) - RSUs - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Shares Outstanding [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	1,949,605	1,475,682
RSUs granted, shares	832,974
RSUs vested, shares	343,552
RSUs forfeited/canceled, shares	15,499
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Expected To Vest, Number	1,737,948
lkq_expected_to_vest_other_than_options_weighted_average_per_share	$ 32.12
Weighted Average Fair Value [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value	32.11	$ 34.94
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	27.69
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value	33.47
RSUs forfeited/canceled, weighted average grant date fair value	$ 34.01
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms	3 years 30 days
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested	$ 49,323

Stock-Based Compensation Sche_2

Stock-Based Compensation Schedule of Stock Option Activity (Details) - Stock options - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Shares Outstanding [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	862,425	1,051,494
Stock options exercised, shares	182,541
Stock options forfeited/canceled, shares	6,528
Exercisable and expected to vest stock options, shares	862,425
Weighted Average Fair Value [Abstract]
Stock options outstanding, weighted average exercise price	$ 10.72	$ 10.15
Stock options exercised, weighted average exercise price	7.31
Stock options forfeited/canceled, weighted average exercise price	15.21
Exercisable and expected to vest stock options, weighted average exercise price	$ 10.72
Weighted Average Contractual Term [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term	255 days
Exercisable and expected to vest stock options, weighted average remaining contractual term (years)	255 days
Aggregate Intrinsic Value [Abstract]
Stock options exercised, aggregate intrinsic value	$ 3,274
Stock options outstanding, aggregate intrinsic value	15,362
Exercisable and expected to vest stock options, aggregate intrinsic value	$ 15,362

Schedule of Stock-Based Compens

Schedule of Stock-Based Compensation Expense Expected to be Recognized (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award
Stock-based compensation expense	$ 5,673	$ 5,982
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options	$ 55,000

Earnings Per Share Earnings P_2

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

Schedule of Antidilutive Securi

Schedule of Antidilutive Securities Excluded from Computation of Diluted Earnings Per Share (Details) - shares shares in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Restricted Stock Units (RSUs) [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share
Antidilutive securities	599	0
Employee Stock Option [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share
Antidilutive securities	32	0

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Income (Loss) Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018	Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent			21.00%	35.00%
Accumulated other comprehensive loss	$ 190,854	$ 14,618	$ 174,950	$ 70,476
Pretax income (loss)	5,698	43,305
Income tax effect	(3,654)	1,111
Reclassification of unrealized loss (gain)	(18,935)	8,747
Reclassification of deferred income taxes	4,450	(2,045)
Other comprehensive income from unconsolidated subsidiaries	(3,463)	(605)
Adoption of ASU 2018-02 (see Note 8)		5,345
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss	187,492	20,589	177,597	71,933
Pretax income (loss)	(9,895)	48,435
Income tax effect	0	50
Reclassification of unrealized loss (gain)	0	0
Reclassification of deferred income taxes	0	0
Other comprehensive income from unconsolidated subsidiaries	0	0
Adoption of ASU 2018-02 (see Note 8)		2,859
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss	(11,637)	(17,278)	(14,374)	(11,538)
Pretax income (loss)	15,593	(4,501)
Income tax effect	(3,654)	1,053
Reclassification of unrealized loss (gain)	(19,188)	8,747
Reclassification of deferred income taxes	4,512	(2,045)
Other comprehensive income from unconsolidated subsidiaries	0	0
Adoption of ASU 2018-02 (see Note 8)		2,486
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss	7,884	9,393	8,075	8,772
Pretax income (loss)	0	(629)
Income tax effect	0	8
Reclassification of unrealized loss (gain)	253	0
Reclassification of deferred income taxes	(62)	0
Other comprehensive income from unconsolidated subsidiaries	0	0
Adoption of ASU 2018-02 (see Note 8)		0
Accumulated Gain (Loss) from Unconsoldated Subsidiaries [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss	7,115	1,914	$ 3,652	$ 1,309
Pretax income (loss)	0	0
Income tax effect	0	0
Reclassification of unrealized loss (gain)	0	0
Reclassification of deferred income taxes	0	0
Other comprehensive income from unconsolidated subsidiaries	(3,463)	(605)
Adoption of ASU 2018-02 (see Note 8)		0
Cross Currency Fx Forward Contract [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax	4,000	1,000
Interest Rate Swap [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax		$ 2,000
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax	$ 2,000

Accumulated Other Comprehensi_4

Accumulated Other Comprehensive Income (Loss) Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Schedule of Accumulated Other Comprehensive Income (Loss) [Line Items]
Adoption of ASU 2018-02 (see Note 8)		$ 5,345
Interest Rate Swap
Schedule of Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax		2,000
Cross Currency Fx Forward Contract [Member]
Schedule of Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax	$ 4,000	1,000
Cross Currency Interest Rate Contract [Member]
Schedule of Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax	$ 13,000	12,000
Accumulated Other Comprehensive Income (Loss)
Schedule of Accumulated Other Comprehensive Income (Loss) [Line Items]
Adoption of ASU 2018-02 (see Note 8)		$ 5,345

Long-Term Obligations - Additio

Long-Term Obligations - Additional Information (Details) $ in Thousands, € in Millions	Nov. 20, 2018USD ($)	Mar. 31, 2019USD ($)	Mar. 31, 2018USD ($)	Dec. 31, 2018USD ($)	Jan. 29, 2024USD ($)	Dec. 20, 2018USD ($)	Apr. 09, 2018EUR (€)	Dec. 01, 2017USD ($)	Apr. 14, 2016	May 09, 2013USD ($)
Debt Instrument
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Debt		$ 7,000
Debt and Capital Lease Obligations		4,264,148		$ 4,347,697
Borrowings under revolving credit facilities		284,641	$ 201,669
Repayments of Long-term Debt		2,188	$ 4,405
Loans Payable [Member]
Debt Instrument
Secured Debt		347,813		350,000
Borrowings under revolving credit facilities	$ 400,000
Repayments of Long-term Debt	240,000
US Notes (2023) [Member]
Debt Instrument
Long-term Debt		600,000		600,000
Senior notes interest rate										4.75%
Euro Notes (2024)
Debt Instrument
Long-term Debt		560,900		573,350
Senior notes interest rate									3.875%
Euro Notes 2026/28 [Member]
Debt Instrument
Payments of Financing Costs				16,000
Long-term Debt		1,121,800		1,146,700			€ 1,000
Receivables securitization
Debt Instrument
Transfers Accounted for as Secured Borrowings, Associated Liabilities, Carrying Amount		$ 79,690		$ 110,000
Revolving Credit Facility [Member]
Debt Instrument
Increment change in applicable margin								0.25%
Weighted average interest rates		1.80%		1.90%
Long-Term Line of Credit, Current		$ 11,000		$ 9,000
Outstanding letters of credit		65,000
Line of Credit Facility, Remaining Borrowing Capacity		$ 1,700,000
Letter of Credit [Member]
Debt Instrument
Line of Credit Facility, Commitment Fee Percentage		0.125%
Amendment No. 3, Fourth Amended and Restate Credit Agreement [Member] | Revolving Credit Facility [Member]
Debt Instrument
Line of Credit Facility, Maximum Borrowing Capacity	$ 3,150,000
Line of Credit Facility, Frequency of Payments		quarterly installments
Line of Credit Facility, Periodic Payment		$ 2,000			$ 4,000
Payments of Financing Costs				4,000
Fourth Amended Credit Agreement | Revolving Credit Facility [Member]
Debt Instrument
Line of Credit Facility, Maximum Borrowing Capacity								$ 2,750,000
Mitsubishi UFJ [Member] | Receivables securitization
Debt Instrument
Line of Credit Facility, Maximum Borrowing Capacity						$ 110,000
Weighted average interest rates		3.40%
Transfers Accounted for as Secured Borrowings, Associated Liabilities, Carrying Amount		$ 80,000		110,000
Twenty Twenty Three [Domain] | US Notes (2023) [Member]
Debt Instrument
Long-term Debt										$ 600,000
TwentyTwentySix [Member] | Euro Notes 2026/28 [Member]
Debt Instrument
Long-term Debt | €							€ 750
Senior notes interest rate							3.625%
TwentyTwentyEight [Member] | Euro Notes 2026/28 [Member]
Debt Instrument
Long-term Debt | €							€ 250
Senior notes interest rate							4.125%
Net Receivables [Member] | Mitsubishi UFJ [Member] | Receivables securitization
Debt Instrument
Debt Instrument, Collateral Amount		$ 142,000		$ 132,000
Maximum increment [Member] | Revolving Credit Facility [Member]
Debt Instrument
Increment change in commitment fees		0.05%

Schedule of Long-Term Obligatio

Schedule of Long-Term Obligations (Details) $ in Thousands, € in Millions	Nov. 20, 2018USD ($)	Mar. 31, 2019USD ($)	Mar. 31, 2018USD ($)	Dec. 31, 2018USD ($)	Apr. 09, 2018EUR (€)	Apr. 14, 2016EUR (€)
Debt Instrument
Borrowings under revolving credit facilities		$ 284,641	$ 201,669
Repayments of Long-term Debt		2,188	$ 4,405
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Debt		7,000
Finance Lease, Liability		42,160		$ 39,966
Long-term obligations, total		4,264,148		4,347,697
Deferred Finance Costs, Noncurrent, Net		(34,810)		(36,906)
Deferred Finance Costs, Current, Net		(289)		(291)
Long-term obligations, total, net		4,229,049		4,310,500
Current portion of long-term obligations		(136,283)		(121,826)
Long-term obligations, excluding current portion		4,092,766		4,188,674
Loans Payable
Debt Instrument
Borrowings under revolving credit facilities	$ 400,000
Repayments of Long-term Debt	$ 240,000
Term loan		347,813		350,000
Revolving Credit Facility [Member]
Debt Instrument
Long-term Line of Credit		1,363,544		1,387,177
US Notes (2023) [Member]
Debt Instrument
Long-term Debt		600,000		600,000
Euro Notes (2024)
Debt Instrument
Long-term Debt		560,900		573,350
Euro Notes 2026/28 [Member]
Debt Instrument
Long-term Debt		1,121,800		1,146,700	€ 1,000
Receivables securitization
Debt Instrument
Transfers Accounted for as Secured Borrowings, Associated Liabilities, Carrying Amount		79,690		110,000
Notes payable
Debt Instrument
Notes Payable		21,701		23,056
Other Long Term Debt
Debt Instrument
Other long-term debt		$ 126,540		$ 117,448
Twenty Twenty Four [Domain] | Euro Notes (2024)
Debt Instrument
Long-term Debt | €						€ 500
TwentyTwentySix [Member] | Euro Notes 2026/28 [Member]
Debt Instrument
Long-term Debt | €					750
TwentyTwentyEight [Member] | Euro Notes 2026/28 [Member]
Debt Instrument
Long-term Debt | €					€ 250

Schedule of Long-Term Obligat_2

Schedule of Long-Term Obligations (Parenthetical) (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Debt Instrument
Debt Issuance Costs, Gross	$ 37
Notes payable
Debt Instrument
Debt, Weighted Average Interest Rate	2.10%	2.00%
Other Long Term Debt
Debt Instrument
Debt, Weighted Average Interest Rate	1.90%	1.80%

Derivative Instruments and He_3

Derivative Instruments and Hedging Activities (Details) $ in Thousands, € in Millions	Mar. 31, 2019USD ($)	Mar. 31, 2019EUR (€)	Dec. 31, 2018USD ($)	Dec. 31, 2016USD ($)	Dec. 31, 2016EUR (€)
Effect of Netting Derivative Instruments	$ (12,000)		$ (14,000)
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net	4,000
Derivative Asset, Current	2,242		211
Derivative Liability, Current	144		127
Settlement of Notional Amounts | €		€ (15)
Derivative Asset, Noncurrent	19,019		22,636
Derivative Liability, Noncurrent	29,442		40,870
Interest Rate Swap Sold [Member]
Derivative, Notional Amount			110,000
Interest Rate Swap [Member]
Derivative, Notional Amount	480,000		480,000
Derivative Asset, Current	0		0
Derivative Liability, Current	0		0
Derivative Liability, Noncurrent	0		0
Cross Currency Interest Rate Contract [Member]
Derivative, Notional Amount	570,349		574,315	$ 422,000	€ 400
Derivative Asset, Current	2,242		211
Derivative Liability, Current	144		127
Derivative Asset, Noncurrent	7,669		7,669
Derivative Liability, Noncurrent	29,442		40,870
Interest Rate Swap [Member]
Derivative Asset, Noncurrent	11,350		$ 14,967
2018 Cross Currency Swaps [Member] | Cross Currency Interest Rate Contract [Member]
Derivative, Notional Amount	$ 184,000	€ 160

Fair Value Measurements (Detail

Fair Value Measurements (Details) $ in Thousands, € in Billions	Mar. 31, 2019USD ($)	Dec. 31, 2018USD ($)	Apr. 09, 2018EUR (€)
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Long-term Line of Credit	$ 1,700,000	$ 1,700,000
Derivative Liability, Noncurrent	29,442	40,870
Borrowings Under Credit Facility, FV	1,700,000	1,700,000
Interest Rate Swap [Member]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Assets, Fair Value Disclosure	11,350
Fair Value, Measurements, Recurring [Member]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Assets, Fair Value Disclosure	74,577	70,496
Financial and Nonfinancial Liabilities, Fair Value Disclosure	91,353	95,190
Fair Value, Measurements, Recurring [Member] | Cash Surrender Value [Member]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Assets, Fair Value Disclosure	53,316	47,649
Fair Value, Measurements, Recurring [Member] | Interest Rate Swap [Member]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Assets, Fair Value Disclosure		14,967
Fair Value, Measurements, Recurring [Member] | Contingent Consideration Liabilities [Member]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Financial and Nonfinancial Liabilities, Fair Value Disclosure	5,274	5,209
Fair Value, Measurements, Recurring [Member] | Deferred Compensation Liabilities [Member]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Financial and Nonfinancial Liabilities, Fair Value Disclosure	56,493	48,984
Fair Value, Measurements, Recurring [Member] | Cross Currency Interest Rate Contract [Member]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Assets, Fair Value Disclosure	9,911	7,880
Financial and Nonfinancial Liabilities, Fair Value Disclosure	29,586	40,997
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Assets, Fair Value Disclosure	0	0
Financial and Nonfinancial Liabilities, Fair Value Disclosure	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Cash Surrender Value [Member]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Assets, Fair Value Disclosure	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Interest Rate Swap [Member]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Assets, Fair Value Disclosure	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Contingent Consideration Liabilities [Member]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Financial and Nonfinancial Liabilities, Fair Value Disclosure	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Deferred Compensation Liabilities [Member]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Financial and Nonfinancial Liabilities, Fair Value Disclosure	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Cross Currency Interest Rate Contract [Member]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Assets, Fair Value Disclosure	0	0
Financial and Nonfinancial Liabilities, Fair Value Disclosure	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Assets, Fair Value Disclosure	74,577	70,496
Financial and Nonfinancial Liabilities, Fair Value Disclosure	86,079	89,981
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Cash Surrender Value [Member]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Assets, Fair Value Disclosure	53,316	47,649
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Assets, Fair Value Disclosure	11,350	14,967
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Contingent Consideration Liabilities [Member]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Financial and Nonfinancial Liabilities, Fair Value Disclosure	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Deferred Compensation Liabilities [Member]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Financial and Nonfinancial Liabilities, Fair Value Disclosure	56,493	48,984
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Cross Currency Interest Rate Contract [Member]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Assets, Fair Value Disclosure	9,911	7,880
Financial and Nonfinancial Liabilities, Fair Value Disclosure	29,586	40,997
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Assets, Fair Value Disclosure	0	0
Financial and Nonfinancial Liabilities, Fair Value Disclosure	5,274	5,209
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Cash Surrender Value [Member]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Assets, Fair Value Disclosure	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Interest Rate Swap [Member]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Assets, Fair Value Disclosure	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Contingent Consideration Liabilities [Member]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Financial and Nonfinancial Liabilities, Fair Value Disclosure	5,274	5,209
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Deferred Compensation Liabilities [Member]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Financial and Nonfinancial Liabilities, Fair Value Disclosure	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Cross Currency Interest Rate Contract [Member]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Assets, Fair Value Disclosure	0	0
Financial and Nonfinancial Liabilities, Fair Value Disclosure	0	0
Euro Notes 2026/28 [Member]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Long-term Debt, Fair Value	1,200,000	1,100,000
Long-term Debt	1,121,800	1,146,700	€ 1
Euro Notes (2024)
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Long-term Debt, Fair Value	599,000	586,000
Long-term Debt	560,900	573,350
Receivables securitization
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Transfers Accounted for as Secured Borrowings, Associated Liabilities, Carrying Amount	79,690	110,000
US Notes (2023) [Member]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Long-term Debt, Fair Value	603,000	574,000
Long-term Debt	$ 600,000	$ 600,000

Leases (Details)

Leases (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Classification [Line Items]
Residual Value of Leased Asset	$ 76,000
Operating Lease, Payments	$ 73,976
Operating Lease, Weighted Average Remaining Lease Term	9 years 300 days
Finance Lease, Weighted Average Remaining Lease Term	8 years 280 days
Operating Lease, Weighted Average Discount Rate, Percent	5.40%
Finance Lease, Liability, Payments, Remainder of Fiscal Year	$ 9,087
Lease, Liability, Payments, Remainder of Fiscal Year	231,161
Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year	222,074
Lessee, Operating Lease, Liability, Payments, Due Year Two	265,133
Finance Lease, Liability, Payments, Due Year Two	10,705
Lease, Liability, Payments, Due Year Two	275,838
Lessee, Operating Lease, Liability, Payments, Due Year Three	217,839
Finance Lease, Liability, Payments, Due Year Three	8,571
Lease, Liability, Payments, Due Year Three	226,410
Lessee, Operating Lease, Liability, Payments, Due Year Four	166,904
Finance Lease, Liability, Payments, Due Year Four	6,214
Lessee, Operating Lease, Liability, Payments, Due Year Five	138,834
Finance Lease, Liability, Payments, Due Year Five	2,676
Lease, Liability, Payments, Remainder of Year Five	141,510
Lessee, Operating Lease, Liability, Payments Due Year Six	115,318
Finance Lease, Liability, Payments, Due Year Six	2,210
Lease, Liability, Payments, Remainder of Year Six	117,528
Lessee, Operating Lease, Liability, Payments Due After Year Six	704,382
Finance Lease, Liability, Payments, Due After Year Six	16,481
Lease, Liability, Payments, Due After Year Six	720,863
Lessee, Operating Lease, Liability, Payments, Due	1,830,484
Finance Lease, Liability, Payments, Due	55,944
Lease, Liability, Payments Due	1,886,428
Lessee, Operating Lease, Liability, Undiscounted Excess Amount	504,498
Finance Lease, Liability, Undiscounted Excess Amount	13,784
Lease, Liability, Undiscounted Excess Amount	518,282
Operating Lease, Liability	1,325,986
Finance Lease, Liability	$ 42,160	$ 39,966
Finance Lease, Weighted Average Discount Rate, Percent	4.50%
Finance Lease, Principal Payments	$ 2,642
Leased assets obtained in exchange for new finance lease liabilities	5,245
Leased assets obtained in exchange for new operating lease liabilities	28,563
Operating Lease, Not Yet Commenced, Expense	103,000
Lease, Liability, Payments, Due Year Four	173,118
Operating Leases, Future Minimum Payments Due, Next Twelve Months		294,269
Operating lease assets, net	1,279,576	0
Finance Lease, Right-of-Use Asset	42,311
Lease Right-of-Use-Asset	1,321,887
Current portion of operating lease liabilities	216,172	0
Finance Lease, Liability, Current	10,658
Long-term operating lease liabilities, excluding current portion	1,109,814	0
Finance Lease, Liability, Noncurrent	31,502
Lease Liability	1,368,146
Operating Leases, Future Minimum Payments, Due in Two Years		256,172
Operating Leases, Future Minimum Payments, Due in Three Years		210,632
Operating Leases, Future Minimum Payments, Due in Four Years		158,763
Operating Leases, Future Minimum Payments, Due in Five Years		131,518
Operating Leases, Future Minimum Payments, Due Thereafter		777,165
Operating Leases, Future Minimum Payments Due		$ 1,828,519
Lease, Cost	106,545
Depreciation and Amortization [Member]
Classification [Line Items]
Finance Lease, Right-of-Use Asset, Amortization	2,598
Cost of Sales [Member]
Classification [Line Items]
Operating Lease, Cost, Cost of Goods Sold	3,835
Selling, General and Administrative Expenses [Member]
Classification [Line Items]
Operating Lease, Cost, Cost of Goods Sold	73,282
Short-term Lease, Cost	667
Variable Lease, Cost	25,990
Interest expense, net of interest income [Member]
Classification [Line Items]
Finance Lease, Interest Expense	448
Other income, net [Member]
Classification [Line Items]
Sublease Income	$ (275)
Minimum
Classification [Line Items]
Lessee, Lease, Renewal Term	1 year
Lessee, Operating Lease, Lease Not yet Commenced, Renewal Term	2 years
Maximum
Classification [Line Items]
Lessee, Lease, Renewal Term	40 years
Lessee, Operating Lease, Lease Not yet Commenced, Renewal Term	20 years

Employee Benefit Plans (Details

Employee Benefit Plans (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Service Cost	$ 587	$ 468
Defined Benefit Plan, Interest Cost	985	670
Defined Benefit Plan, Expected Return (Loss) on Plan Assets	(780)	(717)
Defined Benefit Plan, Amortization of Gain (Loss)	253	0
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position	110,000		$ 110,000
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	$ 1,045	$ 421

Income Taxes - Additional Infor

Income Taxes - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018	Dec. 31, 2017
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities			$ 83,415
Provision for income taxes	$ 51,550	$ 49,584
Income before provision for income taxes	$ 190,162	$ 200,935
U.S. federal statutory rate			21.00%	35.00%
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent	1.00%
Effective Income Tax Rate Reconciliation, Percent	27.10%	24.70%
Deferred income taxes	$ 305,770		$ 311,434
Excess Tax Benefit on Stock Based Payments		$ 3,000
Effective Income Tax Rate Reconciliation, Change as a result of the Discrete Items, Percent	1.30%
Stahlgruber [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities			$ 78,130

Segment and Geographic Inform_3

Segment and Geographic Information - Additional Information (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019USD ($)	Mar. 31, 2018USD ($)
Segment Reporting Information
Revenue	$ 3,100,303	$ 2,720,764
Segment EBITDA	319,893	295,216
Depreciation and amortization	$ 76,207	61,066
Number of operating segments	4
Number of reportable segments	3
Intersegment [Member]
Segment Reporting Information
Revenue	$ 0	0
Third Party [Member]
Segment Reporting Information
Revenue	3,100,303	2,720,764
North America
Segment Reporting Information
Revenue	1,302,309	1,329,843
Segment EBITDA	176,636	177,713
Depreciation and amortization	$ 22,239	21,228
Number of reportable segments	1
North America | Intersegment [Member]
Segment Reporting Information
Revenue	$ 103	183
North America | Third Party [Member]
Segment Reporting Information
Revenue	1,302,206	1,329,660
Europe
Segment Reporting Information
Revenue	1,445,541	1,040,430
Segment EBITDA	105,298	75,534
Depreciation and amortization	47,011	32,757
Europe | Intersegment [Member]
Segment Reporting Information
Revenue	0	0
Europe | Third Party [Member]
Segment Reporting Information
Revenue	1,445,541	1,040,430
Specialty
Segment Reporting Information
Revenue	353,737	351,792
Segment EBITDA	37,959	41,969
Depreciation and amortization	6,957	7,081
Specialty | Intersegment [Member]
Segment Reporting Information
Revenue	1,181	1,118
Specialty | Third Party [Member]
Segment Reporting Information
Revenue	352,556	350,674
Intersegment Eliminations [Member]
Segment Reporting Information
Revenue	(1,284)	(1,301)
Segment EBITDA	0	0
Depreciation and amortization	0	0
Intersegment Eliminations [Member] | Intersegment [Member]
Segment Reporting Information
Revenue	(1,284)	(1,301)
Intersegment Eliminations [Member] | Third Party [Member]
Segment Reporting Information
Revenue	$ 0	$ 0

Schedule of Financial Performan

Schedule of Financial Performance by Reportable Segment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Segment Reporting Information
Revenue	$ 3,100,303	$ 2,720,764
Segment EBITDA	319,893	295,216
Depreciation and amortization	76,207	61,066
North America
Segment Reporting Information
Revenue	1,302,309	1,329,843
Segment EBITDA	176,636	177,713
Depreciation and amortization	22,239	21,228
Europe
Segment Reporting Information
Revenue	1,445,541	1,040,430
Segment EBITDA	105,298	75,534
Depreciation and amortization	47,011	32,757
Specialty
Segment Reporting Information
Revenue	353,737	351,792
Segment EBITDA	37,959	41,969
Depreciation and amortization	6,957	7,081
Intersegment Eliminations [Member]
Segment Reporting Information
Revenue	(1,284)	(1,301)
Segment EBITDA	0	0
Depreciation and amortization	0	0
Third Party [Member]
Segment Reporting Information
Revenue	3,100,303	2,720,764
Third Party [Member] | North America
Segment Reporting Information
Revenue	1,302,206	1,329,660
Third Party [Member] | Europe
Segment Reporting Information
Revenue	1,445,541	1,040,430
Third Party [Member] | Specialty
Segment Reporting Information
Revenue	352,556	350,674
Third Party [Member] | Intersegment Eliminations [Member]
Segment Reporting Information
Revenue	0	0
Intersegment [Member]
Segment Reporting Information
Revenue	0	0
Intersegment [Member] | North America
Segment Reporting Information
Revenue	103	183
Intersegment [Member] | Europe
Segment Reporting Information
Revenue	0	0
Intersegment [Member] | Specialty
Segment Reporting Information
Revenue	1,181	1,118
Intersegment [Member] | Intersegment Eliminations [Member]
Segment Reporting Information
Revenue	$ (1,284)	$ (1,301)

Reconciliation Of Segment EBITD

Reconciliation Of Segment EBITDA To Net Income (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Reconciliation of Segment Earnings Before Interest Taxes Depreciation And Amortization to Net Income Table [Line Items]
Net income	$ 99,063	$ 152,763
Less: net income (loss) attributable to noncontrolling interest	1,015	(197)
Noncontrolling interest	57,292		$ 56,454
Net income attributable to LKQ stockholders	98,048	152,960
Depreciation and amortization	71,002	56,458
Depreciation and amortization - cost of goods sold	5,205	4,608
Interest expense, net of interest income	36,089	28,515
Provision for income taxes	51,550	49,584
EBITDA	261,894	292,125
Equity in (losses) earnings of unconsolidated subsidiaries	39,549	(1,412)
Gains on bargain purchases			$ 2,418
Restructuring and acquisition related expenses	3,307	4,054
Inventory step-up adjustment - acquisition related	0	403
Impairment of net assets held for sale	15,023	0
Change in fair value of contingent consideration liabilities	(120)	(46)
Segment EBITDA	$ 319,893	$ 295,216

Schedule of Capital Expenditure

Schedule of Capital Expenditures by Reportable Segment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Segment Reporting Information
Capital Expenditures	$ 53,016	$ 62,189
North America
Segment Reporting Information
Capital Expenditures	31,234	29,662
Europe
Segment Reporting Information
Capital Expenditures	19,577	28,815
Specialty
Segment Reporting Information
Capital Expenditures	$ 2,205	$ 3,712

Schedule of Assets by Reportabl

Schedule of Assets by Reportable Segment (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Segment Reporting Information
Receivables, net	$ 1,353,491	$ 1,154,083
Inventories	2,692,006	2,836,075
Property, plant and equipment, net	1,206,342	1,220,162
Operating lease assets, net	1,279,576	0
Equity method investments	134,234	179,169
Other unallocated assets	6,000,261	6,003,913
Total assets	12,665,910	11,393,402
North America
Segment Reporting Information
Receivables, net	445,056	411,818
Inventories	994,438	1,076,306
Property, plant and equipment, net	574,046	570,508
Operating lease assets, net	757,590	0
Equity method investments	17,551	16,404
Europe
Segment Reporting Information
Receivables, net	770,543	649,174
Inventories	1,363,929	1,410,264
Property, plant and equipment, net	546,725	562,600
Operating lease assets, net	438,272	0
Equity method investments	116,683	162,765
Specialty
Segment Reporting Information
Receivables, net	137,892	93,091
Inventories	333,639	349,505
Property, plant and equipment, net	85,571	87,054
Operating lease assets, net	$ 83,714	$ 0

Segment and Geographic Inform_4

Segment and Geographic Information Schedule of Revenue by Geographic Area (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Revenues from External Customers and Long-Lived Assets
Revenue	$ 3,100,303	$ 2,720,764
UNITED STATES
Revenues from External Customers and Long-Lived Assets
Revenue	1,542,026	1,560,027
UNITED KINGDOM
Revenues from External Customers and Long-Lived Assets
Revenue	412,813	430,992
GERMANY
Revenues from External Customers and Long-Lived Assets
Revenue	386,465	803
Other countries
Revenues from External Customers and Long-Lived Assets
Revenue	$ 758,999	$ 728,942

Schedule of Tangible Long-Lived

Schedule of Tangible Long-Lived Assets by Geographic Area (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Revenues from External Customers and Long-Lived Assets
Long-Lived Assets	$ 2,485,918	$ 1,220,162
UNITED STATES
Revenues from External Customers and Long-Lived Assets
Long-Lived Assets	1,424,978	620,125
UNITED KINGDOM
Revenues from External Customers and Long-Lived Assets
Long-Lived Assets	339,147	165,145
Other countries
Revenues from External Customers and Long-Lived Assets
Long-Lived Assets	416,351	217,416
GERMANY
Revenues from External Customers and Long-Lived Assets
Long-Lived Assets	$ 305,442	$ 217,476

Condensed Consolidating Stateme

Condensed Consolidating Statements of Income (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Condensed Financial Statements, Captions [Line Items]
Revenue	$ 3,100,303	$ 2,720,764
Cost of goods sold	1,892,039	1,666,793
Gross margin	1,208,264	1,053,971
Selling, general and administrative expenses	896,532	766,891
Restructuring and acquisition related expenses	3,307	4,054
Impairment of net assets held for sale	15,023	0
Depreciation and amortization	71,002	56,458
Operating income	222,400	226,568
Other expense (income):
Interest expense, net of interest income	36,089	28,515
Intercompany interest (income) expense, net	0	0
Gains on bargain purchases			$ (2,418)
Other income, net	(3,851)	(2,882)
Total other expense, net	32,238	25,633
Income before provision for income taxes	190,162	200,935
Provision for income taxes	51,550	49,584
Equity in (losses) earnings of unconsolidated subsidiaries	(39,549)	1,412
Equity in earnings of subsidiaries	0	0
Net income	99,063	152,763
Income from continuing operations	99,063
Less: net income (loss) attributable to noncontrolling interest	1,015	(197)
Net Income (Loss) Attributable to Parent	98,048	152,960
Parent
Condensed Financial Statements, Captions [Line Items]
Revenue	0	0
Cost of goods sold	0	0
Gross margin	0	0
Selling, general and administrative expenses	9,038	9,130
Restructuring and acquisition related expenses	0	0
Impairment of net assets held for sale	0
Depreciation and amortization	54	29
Operating income	(9,092)	(9,159)
Other expense (income):
Interest expense, net of interest income	13,836	18,008
Intercompany interest (income) expense, net	(15,086)	(15,400)
Other income, net	19	(1,015)
Total other expense, net	(1,231)	1,593
Income before provision for income taxes	(7,861)	(10,752)
Provision for income taxes	(2,046)	(3,904)
Equity in (losses) earnings of unconsolidated subsidiaries	0	0
Equity in earnings of subsidiaries	103,863	159,808
Net income	98,048	152,960
Income from continuing operations	98,048
Less: net income (loss) attributable to noncontrolling interest	0	0
Net Income (Loss) Attributable to Parent	98,048	152,960
Guarantors
Condensed Financial Statements, Captions [Line Items]
Revenue	1,550,680	1,577,595
Cost of goods sold	921,489	945,915
Gross margin	629,191	631,680
Selling, general and administrative expenses	432,387	426,797
Restructuring and acquisition related expenses	606	330
Impairment of net assets held for sale	8,461
Depreciation and amortization	25,073	24,338
Operating income	162,664	180,215
Other expense (income):
Interest expense, net of interest income	(336)	212
Intercompany interest (income) expense, net	9,189	9,680
Other income, net	(7,831)	(5,882)
Total other expense, net	1,022	4,010
Income before provision for income taxes	161,642	176,205
Provision for income taxes	43,303	45,877
Equity in (losses) earnings of unconsolidated subsidiaries	1,147	0
Equity in earnings of subsidiaries	9,712	5,110
Net income	129,198	135,438
Income from continuing operations	129,198
Less: net income (loss) attributable to noncontrolling interest	0	0
Net Income (Loss) Attributable to Parent	129,198	135,438
Non-Guarantors
Condensed Financial Statements, Captions [Line Items]
Revenue	1,586,877	1,180,242
Cost of goods sold	1,007,804	757,951
Gross margin	579,073	422,291
Selling, general and administrative expenses	455,107	330,964
Restructuring and acquisition related expenses	2,701	3,724
Impairment of net assets held for sale	6,562
Depreciation and amortization	45,875	32,091
Operating income	68,828	55,512
Other expense (income):
Interest expense, net of interest income	22,589	10,295
Intercompany interest (income) expense, net	5,897	5,720
Other income, net	3,961	4,015
Total other expense, net	32,447	20,030
Income before provision for income taxes	36,381	35,482
Provision for income taxes	10,293	7,611
Equity in (losses) earnings of unconsolidated subsidiaries	(40,696)	1,412
Equity in earnings of subsidiaries	0	0
Net income	(14,608)	29,283
Income from continuing operations	(14,608)
Less: net income (loss) attributable to noncontrolling interest	1,015	(197)
Net Income (Loss) Attributable to Parent	(15,623)	29,480
Eliminations
Condensed Financial Statements, Captions [Line Items]
Revenue	(37,254)	(37,073)
Cost of goods sold	(37,254)	(37,073)
Gross margin	0	0
Selling, general and administrative expenses	0	0
Restructuring and acquisition related expenses	0	0
Impairment of net assets held for sale	0
Depreciation and amortization	0	0
Operating income	0	0
Other expense (income):
Interest expense, net of interest income	0	0
Intercompany interest (income) expense, net	0	0
Other income, net	0	0
Total other expense, net	0	0
Income before provision for income taxes	0	0
Provision for income taxes	0	0
Equity in (losses) earnings of unconsolidated subsidiaries	0	0
Equity in earnings of subsidiaries	(113,575)	(164,918)
Net income	(113,575)	(164,918)
Income from continuing operations	(113,575)
Less: net income (loss) attributable to noncontrolling interest	0	0
Net Income (Loss) Attributable to Parent	$ (113,575)	$ (164,918)

Condensed Consolidating State_2

Condensed Consolidating Statements of Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Condensed Financial Statements, Captions [Line Items]
Net income	$ 99,063	$ 152,763
Less: net income (loss) attributable to noncontrolling interest	1,015	(197)
Net income attributable to LKQ stockholders	98,048	152,960
Other comprehensive income (loss):
Foreign currency translation, net of tax	(9,895)	48,485
Net change in unrealized gains/losses on cash flow hedges, net of tax	(2,737)	3,254
Net change in unrealized gains/losses on pension plans, net of tax	191	(621)
Net change in other comprehensive loss from unconsolidated subsidiaries	3,463	605
Other comprehensive (loss) income	(15,904)	50,513
Comprehensive income	83,159	203,276
Less: comprehensive income (loss) attributable to noncontrolling interest	1,015	(197)
Comprehensive income attributable to LKQ stockholders	82,144	203,473
Parent
Condensed Financial Statements, Captions [Line Items]
Net income	98,048	152,960
Less: net income (loss) attributable to noncontrolling interest	0	0
Net income attributable to LKQ stockholders	98,048	152,960
Other comprehensive income (loss):
Foreign currency translation, net of tax	(9,895)	48,485
Net change in unrealized gains/losses on cash flow hedges, net of tax	(2,737)	3,254
Net change in unrealized gains/losses on pension plans, net of tax	191	(621)
Net change in other comprehensive loss from unconsolidated subsidiaries	3,463	605
Other comprehensive (loss) income	(15,904)	50,513
Comprehensive income	82,144	203,473
Less: comprehensive income (loss) attributable to noncontrolling interest	0
Comprehensive income attributable to LKQ stockholders	82,144	203,473
Guarantors
Condensed Financial Statements, Captions [Line Items]
Net income	129,198	135,438
Less: net income (loss) attributable to noncontrolling interest	0	0
Net income attributable to LKQ stockholders	129,198	135,438
Other comprehensive income (loss):
Foreign currency translation, net of tax	2,194	(2,183)
Net change in unrealized gains/losses on cash flow hedges, net of tax	0	0
Net change in unrealized gains/losses on pension plans, net of tax	(4)	(621)
Net change in other comprehensive loss from unconsolidated subsidiaries	0	0
Other comprehensive (loss) income	2,190	(2,804)
Comprehensive income	131,388	132,634
Less: comprehensive income (loss) attributable to noncontrolling interest	0
Comprehensive income attributable to LKQ stockholders	131,388	132,634
Non-Guarantors
Condensed Financial Statements, Captions [Line Items]
Net income	(14,608)	29,283
Less: net income (loss) attributable to noncontrolling interest	1,015	(197)
Net income attributable to LKQ stockholders	(15,623)	29,480
Other comprehensive income (loss):
Foreign currency translation, net of tax	(10,466)	49,055
Net change in unrealized gains/losses on cash flow hedges, net of tax	0	0
Net change in unrealized gains/losses on pension plans, net of tax	195	0
Net change in other comprehensive loss from unconsolidated subsidiaries	3,463	605
Other comprehensive (loss) income	(13,734)	48,450
Comprehensive income	(28,342)	77,733
Less: comprehensive income (loss) attributable to noncontrolling interest	1,015	(197)
Comprehensive income attributable to LKQ stockholders	(29,357)	77,930
Eliminations
Condensed Financial Statements, Captions [Line Items]
Net income	(113,575)	(164,918)
Less: net income (loss) attributable to noncontrolling interest	0	0
Net income attributable to LKQ stockholders	(113,575)	(164,918)
Other comprehensive income (loss):
Foreign currency translation, net of tax	8,272	(46,872)
Net change in unrealized gains/losses on cash flow hedges, net of tax	0	0
Net change in unrealized gains/losses on pension plans, net of tax	(191)	621
Net change in other comprehensive loss from unconsolidated subsidiaries	(3,463)	(605)
Other comprehensive (loss) income	11,544	(45,646)
Comprehensive income	(102,031)	(210,564)
Less: comprehensive income (loss) attributable to noncontrolling interest	0
Comprehensive income attributable to LKQ stockholders	$ (102,031)	$ (210,564)

Condensed Consolidating Balance

Condensed Consolidating Balance Sheets (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 316,066	$ 331,761	$ 245,679
Receivables, net	1,353,491	1,154,083
Intercompany receivables, net	0	0
Inventories	2,692,006	2,836,075
Prepaid expenses and other current assets	283,207	199,030
Total current assets	4,644,770	4,520,949
Property, plant and equipment, net	1,206,342	1,220,162
Operating lease assets, net	1,279,576	0
Intangible assets:
Goodwill	4,354,306	4,381,458
Other intangibles, net	889,609	928,752
Investment in subsidiaries	0	0
Intercompany notes receivable	0	0
Equity method investments	134,234	179,169
Other assets	157,073	162,912
Total assets	12,665,910	11,393,402
Current liabilities:
Accounts payable	952,688	942,398
Intercompany payables, net	0	0
Accrued expenses:
Accrued payroll-related liabilities	143,026	172,005
Other accrued expenses	317,826	288,425
Refund liability	105,435	104,585
Other current liabilities	100,058	61,109
Current portion of operating lease liabilities	216,172	0
Current portion of long-term obligations	136,283	121,826
Total current liabilities	1,971,488	1,690,348
Long-term operating lease liabilities, excluding current portion	1,109,814	0
Long-term obligations, excluding current portion	4,092,766	4,188,674
Intercompany notes payable	0	0
Deferred income taxes	305,770	311,434
Other noncurrent liabilities	329,298	364,194
Total Company stockholders' equity	4,799,482	4,782,298
Noncontrolling interest	57,292	56,454
Total stockholders' equity	4,856,774	4,838,752	4,418,981	$ 4,206,653
Total liabilities and stockholders’ equity	12,665,910	11,393,402
Parent
Current assets:
Cash and cash equivalents	40,703	25,633	17,340
Receivables, net	386	310
Intercompany receivables, net	7,411	6,978
Inventories	0	0
Prepaid expenses and other current assets	4,668	18,611
Total current assets	53,168	51,532
Property, plant and equipment, net	1,630	1,547
Operating lease assets, net	3,857
Intangible assets:
Goodwill	0	0
Other intangibles, net	234	260
Investment in subsidiaries	5,288,058	5,224,006
Intercompany notes receivable	1,183,505	1,220,582
Equity method investments	0	0
Other assets	72,335	70,283
Total assets	6,602,787	6,568,210
Current liabilities:
Accounts payable	2,111	2,454
Intercompany payables, net	0	0
Accrued expenses:
Accrued payroll-related liabilities	4,967	6,652
Other accrued expenses	12,930	5,454
Refund liability	0	0
Other current liabilities	16,590	283
Current portion of operating lease liabilities	204
Current portion of long-term obligations	10,649	8,459
Total current liabilities	47,451	23,302
Long-term operating lease liabilities, excluding current portion	4,054
Long-term obligations, excluding current portion	1,624,269	1,628,677
Intercompany notes payable	0	0
Deferred income taxes	7,187	8,045
Other noncurrent liabilities	120,344	125,888
Total Company stockholders' equity	4,799,482	4,782,298
Noncontrolling interest	0	0
Total stockholders' equity	4,799,482	4,782,298
Total liabilities and stockholders’ equity	6,602,787	6,568,210
Guarantors
Current assets:
Cash and cash equivalents	31,744	29,285	28,975
Receivables, net	366,235	316,726
Intercompany receivables, net	0	0
Inventories	1,245,544	1,343,612
Prepaid expenses and other current assets	162,616	99,356
Total current assets	1,806,139	1,788,979
Property, plant and equipment, net	600,965	600,054
Operating lease assets, net	801,420
Intangible assets:
Goodwill	1,973,101	1,973,364
Other intangibles, net	260,491	272,451
Investment in subsidiaries	123,496	111,826
Intercompany notes receivable	51,118	10,515
Equity method investments	17,551	16,404
Other assets	40,183	40,548
Total assets	5,674,464	4,814,141
Current liabilities:
Accounts payable	339,448	343,116
Intercompany payables, net	19,147	12,880
Accrued expenses:
Accrued payroll-related liabilities	33,658	70,267
Other accrued expenses	105,465	105,672
Refund liability	51,082	50,899
Other current liabilities	22,596	17,860
Current portion of operating lease liabilities	116,053
Current portion of long-term obligations	3,326	2,932
Total current liabilities	690,775	603,626
Long-term operating lease liabilities, excluding current portion	712,259
Long-term obligations, excluding current portion	16,248	13,532
Intercompany notes payable	577,301	597,283
Deferred income taxes	135,287	135,355
Other noncurrent liabilities	75,446	99,147
Total Company stockholders' equity	3,467,148	3,365,198
Noncontrolling interest	0	0
Total stockholders' equity	3,467,148	3,365,198
Total liabilities and stockholders’ equity	5,674,464	4,814,141
Non-Guarantors
Current assets:
Cash and cash equivalents	243,619	276,843	199,364
Receivables, net	986,870	837,047
Intercompany receivables, net	19,147	12,880
Inventories	1,446,462	1,492,463
Prepaid expenses and other current assets	115,923	81,063
Total current assets	2,812,021	2,700,296
Property, plant and equipment, net	603,747	618,561
Operating lease assets, net	474,299
Intangible assets:
Goodwill	2,381,205	2,408,094
Other intangibles, net	628,884	656,041
Investment in subsidiaries	0	0
Intercompany notes receivable	0	0
Equity method investments	116,683	162,765
Other assets	44,555	52,081
Total assets	7,061,394	6,597,838
Current liabilities:
Accounts payable	611,129	596,828
Intercompany payables, net	7,411	6,978
Accrued expenses:
Accrued payroll-related liabilities	104,401	95,086
Other accrued expenses	199,431	177,299
Refund liability	54,353	53,686
Other current liabilities	60,872	42,966
Current portion of operating lease liabilities	99,915
Current portion of long-term obligations	122,308	110,435
Total current liabilities	1,259,820	1,083,278
Long-term operating lease liabilities, excluding current portion	393,501
Long-term obligations, excluding current portion	2,452,249	2,546,465
Intercompany notes payable	657,322	633,814
Deferred income taxes	163,296	168,034
Other noncurrent liabilities	133,508	139,159
Total Company stockholders' equity	1,944,406	1,970,634
Noncontrolling interest	57,292	56,454
Total stockholders' equity	2,001,698	2,027,088
Total liabilities and stockholders’ equity	7,061,394	6,597,838
Eliminations
Current assets:
Cash and cash equivalents	0	0	$ 0
Receivables, net	0	0
Intercompany receivables, net	(26,558)	(19,858)
Inventories	0	0
Prepaid expenses and other current assets	0	0
Total current assets	(26,558)	(19,858)
Property, plant and equipment, net	0	0
Operating lease assets, net	0
Intangible assets:
Goodwill	0	0
Other intangibles, net	0	0
Investment in subsidiaries	(5,411,554)	(5,335,832)
Intercompany notes receivable	(1,234,623)	(1,231,097)
Equity method investments	0	0
Other assets	0	0
Total assets	(6,672,735)	(6,586,787)
Current liabilities:
Accounts payable	0	0
Intercompany payables, net	(26,558)	(19,858)
Accrued expenses:
Accrued payroll-related liabilities	0	0
Other accrued expenses	0	0
Refund liability	0	0
Other current liabilities	0	0
Current portion of operating lease liabilities	0
Current portion of long-term obligations	0	0
Total current liabilities	(26,558)	(19,858)
Long-term operating lease liabilities, excluding current portion	0
Long-term obligations, excluding current portion	0	0
Intercompany notes payable	(1,234,623)	(1,231,097)
Deferred income taxes	0	0
Other noncurrent liabilities	0	0
Total Company stockholders' equity	(5,411,554)	(5,335,832)
Noncontrolling interest	0	0
Total stockholders' equity	(5,411,554)	(5,335,832)
Total liabilities and stockholders’ equity	$ (6,672,735)	$ (6,586,787)

Condensed Consolidating State_3

Condensed Consolidating Statements of Cash Flows (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018	Dec. 31, 2017
CASH FLOWS FROM OPERATING ACTIVITIES:
Net cash provided by operating activities	$ 177,225	$ 145,163
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property, plant and equipment	(53,016)	(62,189)
Investment and intercompany note activity with subsidiaries	0	0
Acquisitions, net of cash acquired	(4,785)	(2,966)	$ (1,214,995)
Receipts of deferred purchase price on receivables under factoring arrangements	0	0
Other investing activities, net	17	534
Net cash used in investing activities	(57,784)	(64,621)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from exercise of stock options	1,334	2,255
Taxes paid related to net share settlements of stock-based compensation awards	(1,505)	(3,292)
Payments for Repurchase of Common Stock	(70,462)	0	(60,000)
Borrowings under revolving credit facilities	284,641	201,669
Repayments under revolving credit facilities	(312,339)	(321,525)
Repayments under term loans	(2,188)	(4,405)
Borrowings under receivables securitization facility	6,600	0
(Repayments) borrowings of other debt, net	(625)	4,409
Other financing activities, net	(1,277)	3,383
Investment and intercompany note activity with parent	0	0
Dividends	0	0
Net cash used in financing activities	(132,731)	(117,506)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	(2,513)	2,877
Net decrease in cash, cash equivalents and restricted cash	(15,803)	(34,087)
Cash and cash equivalents, beginning of period			337,250	$ 279,766
Cash and cash equivalents, end of period	316,066	245,679	331,761
Repayments under receivables securitization facility	(36,910)	0
Cash, cash equivalents and restricted cash, end of period	321,447	245,679	337,250
Parent
CASH FLOWS FROM OPERATING ACTIVITIES:
Net cash provided by operating activities	65,970	95,942
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property, plant and equipment	(438)	(163)
Investment and intercompany note activity with subsidiaries	23,342	24,333
Acquisitions, net of cash acquired	0	0
Receipts of deferred purchase price on receivables under factoring arrangements	0	0
Other investing activities, net	0	0
Net cash used in investing activities	22,904	24,170
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from exercise of stock options	1,334	2,255
Taxes paid related to net share settlements of stock-based compensation awards	(1,505)	(3,292)
Payments for Repurchase of Common Stock	(70,462)
Borrowings under revolving credit facilities	194,000	161,000
Repayments under revolving credit facilities	(194,966)	(291,966)
Repayments under term loans	(2,188)	(4,405)
Borrowings under receivables securitization facility	0
(Repayments) borrowings of other debt, net	0	0
Other financing activities, net	(17)	(724)
Investment and intercompany note activity with parent	0	0
Dividends	0	0
Net cash used in financing activities	(73,804)	(137,132)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	0	0
Net decrease in cash, cash equivalents and restricted cash	15,070	(17,020)
Cash and cash equivalents, beginning of period				34,360
Cash and cash equivalents, end of period	40,703	17,340	25,633
Repayments under receivables securitization facility	0
Cash, cash equivalents and restricted cash, end of period	40,703		25,633
Guarantors
CASH FLOWS FROM OPERATING ACTIVITIES:
Net cash provided by operating activities	9,150	35,802
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property, plant and equipment	(30,128)	(29,908)
Investment and intercompany note activity with subsidiaries	0	0
Acquisitions, net of cash acquired	(152)	(2,966)
Receipts of deferred purchase price on receivables under factoring arrangements	75,123	68,171
Other investing activities, net	89	(145)
Net cash used in investing activities	44,932	35,152
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from exercise of stock options	0	0
Taxes paid related to net share settlements of stock-based compensation awards	0	0
Payments for Repurchase of Common Stock	0
Borrowings under revolving credit facilities	0	0
Repayments under revolving credit facilities	0	0
Repayments under term loans	0	0
Borrowings under receivables securitization facility	0
(Repayments) borrowings of other debt, net	763	(30)
Other financing activities, net	0	0
Investment and intercompany note activity with parent	(25,502)	(21,759)
Dividends	(27,353)	(54,995)
Net cash used in financing activities	(52,092)	(76,784)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	469	(326)
Net decrease in cash, cash equivalents and restricted cash	2,459	(6,156)
Cash and cash equivalents, beginning of period				35,131
Cash and cash equivalents, end of period	31,744	28,975	29,285
Repayments under receivables securitization facility	0
Cash, cash equivalents and restricted cash, end of period	31,744		29,285
Non-Guarantors
CASH FLOWS FROM OPERATING ACTIVITIES:
Net cash provided by operating activities	54,335	243
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property, plant and equipment	(22,450)	(32,118)
Investment and intercompany note activity with subsidiaries	0	0
Acquisitions, net of cash acquired	(4,633)	0
Receipts of deferred purchase price on receivables under factoring arrangements	0	0
Other investing activities, net	(72)	679
Net cash used in investing activities	(27,155)	(31,439)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from exercise of stock options	0	0
Taxes paid related to net share settlements of stock-based compensation awards	0	0
Payments for Repurchase of Common Stock	0
Borrowings under revolving credit facilities	90,641	40,669
Repayments under revolving credit facilities	(117,373)	(29,559)
Repayments under term loans	0	0
Borrowings under receivables securitization facility	6,600
(Repayments) borrowings of other debt, net	(1,388)	4,439
Other financing activities, net	(1,260)	4,107
Investment and intercompany note activity with parent	2,160	(2,574)
Dividends	0	0
Net cash used in financing activities	(57,530)	17,082
Effect of exchange rate changes on cash, cash equivalents and restricted cash	(2,982)	3,203
Net decrease in cash, cash equivalents and restricted cash	(33,332)	(10,911)
Cash and cash equivalents, beginning of period				210,275
Cash and cash equivalents, end of period	243,619	199,364	276,843
Repayments under receivables securitization facility	(36,910)
Cash, cash equivalents and restricted cash, end of period	249,000		282,332
Eliminations
CASH FLOWS FROM OPERATING ACTIVITIES:
Net cash provided by operating activities	47,770	13,176
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property, plant and equipment	0	0
Investment and intercompany note activity with subsidiaries	(23,342)	(24,333)
Acquisitions, net of cash acquired	0	0
Receipts of deferred purchase price on receivables under factoring arrangements	(75,123)	(68,171)
Other investing activities, net	0	0
Net cash used in investing activities	(98,465)	(92,504)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from exercise of stock options	0	0
Taxes paid related to net share settlements of stock-based compensation awards	0	0
Payments for Repurchase of Common Stock	0
Borrowings under revolving credit facilities	0	0
Repayments under revolving credit facilities	0	0
Repayments under term loans	0	0
Borrowings under receivables securitization facility	0
(Repayments) borrowings of other debt, net	0	0
Other financing activities, net	0	0
Investment and intercompany note activity with parent	23,342	24,333
Dividends	27,353	54,995
Net cash used in financing activities	50,695	79,328
Effect of exchange rate changes on cash, cash equivalents and restricted cash	0	0
Net decrease in cash, cash equivalents and restricted cash	0	0
Cash and cash equivalents, beginning of period				$ 0
Cash and cash equivalents, end of period	0	$ 0	0
Repayments under receivables securitization facility	0
Cash, cash equivalents and restricted cash, end of period	$ 0		$ 0