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Business Combinations - Additional Information (Details) $ in Thousands, € in Millions, £ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended | 13 Months Ended | 15 Months Ended |  |
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Nov. 30, 2017 | Jul. 30, 2017 | Jun. 30, 2018 USD ($) | Jun. 30, 2019 USD ($) | Jun. 30, 2018 USD ($) shares | Jun. 30, 2018 EUR (€) shares | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 GBP (£) | Dec. 31, 2016 USD ($) | Jun. 30, 2019 USD ($) | Dec. 31, 2017 USD ($) | Jun. 30, 2018 EUR (€) | Apr. 09, 2018 USD ($) | Apr. 09, 2018 EUR (€)
Business Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gains on bargain purchases |  |  |  |  |  |  |  | $ 2,418 |  |  |  |  |  |  |  |
Cash used in acquisitions, net of cash acquired |  |  |  |  |  |  | $ 27,296 | 1,214,995 | $ 513,088 |  |  |  |  |  |  |
Notes issued |  |  |  |  |  |  |  | 11,347 |  |  |  |  |  |  |  |
Other purchase price obligations |  |  |  |  |  |  |  | 2,461 |  |  |  |  |  |  |  |
Operating income |  |  |  |  |  |  | $ 896,643 | 882,241 | $ 844,998 |  |  |  |  |  |  |
Number of acquisitions |  |  |  |  |  |  | 7 |  | 26 |  |  |  |  |  |  |
Contingent consideration liabilities |  |  |  |  |  |  |  | 3,107 |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  | $ 12,506,109 | 11,876,674 | $ 9,736,909 |  |  |  |  |  |  |
Warn Industries [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles |  |  |  |  |  |  |  | 5,000 |  |  |  |  |  |  |  |
Business Acquisition, Effective Date of Acquisition | Nov. 30, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |
Notes issued |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |
Other purchase price obligations |  |  |  |  |  |  |  | (6,084) |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,200,000 | € 1,000
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | shares |  |  |  |  | 8,055,569 | 8,055,569 |  |  |  |  |  |  |  |  |  |
Business Acquisition, Goodwill, Expected Tax Deductible Amount |  |  |  |  |  |  | $ 300,000 |  |  |  |  |  |  |  |  |
Operating income |  |  |  |  |  |  |  | 52,000 |  |  |  |  |  |  |  |
Contingent consideration liabilities |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |
Goodwill, Purchase Accounting Adjustments |  |  |  | $ (7,000) |  |  |  | (908,000) |  |  |  | $ (915,000) |  |  |  |
Revenue |  |  |  |  |  |  |  | 1,100,000 |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |
Notes issued |  |  |  |  |  |  |  | 11,000 |  |  |  |  |  |  |  |
Business Acquisition, Goodwill, Expected Tax Deductible Amount |  |  |  |  |  |  |  | 4,000 |  |  |  |  |  |  |  |
Operating income |  |  |  |  |  |  |  | 3,000 |  |  |  |  |  |  |  |
Goodwill, Acquired During Period |  |  |  |  |  |  |  | 68,000 |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  | $ 46,000 |  |  |  |  |  |  |  |
Wholesale - NA [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of acquisitions |  |  |  |  |  |  | 3 | 4 | 6 |  |  |  |  |  |  |
Self Service [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of acquisitions |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |
Wholesale Europe [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of acquisitions |  |  |  |  |  |  | 3 | 9 | 16 |  |  |  |  |  |  |
All 2019 Acquisitions excluding Stahlgruber Czech Republic Wholesale Business [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total acquisition date fair value of the consideration for acquisitions |  |  |  |  |  |  | $ 63,000 |  |  |  |  |  |  |  |  |
Cash used in acquisitions, net of cash acquired |  |  |  |  |  |  | 29,000 |  |  |  |  |  |  |  |  |
Settlement of pre-existing balances |  |  |  |  |  |  | 5,000 |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Debt |  |  |  |  |  |  | 8,000 |  |  |  |  |  |  |  |  |
Notes issued |  |  |  |  |  |  | 21,000 |  |  |  |  |  |  |  |  |
Other purchase price obligations |  |  |  |  |  |  | 2,000 |  |  |  |  |  |  |  |  |
2017 acquisitions and adjustments to 2016 acquisitions [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total acquisition date fair value of the consideration for acquisitions |  |  |  |  |  |  |  |  | $ 542,000 |  |  |  |  |  |  |
Cash used in acquisitions, net of cash acquired |  |  |  |  |  |  |  |  | 510,000 |  |  |  |  |  |  |
Notes issued |  |  |  |  |  |  |  |  | 20,000 |  |  |  | $ 20,000 |  |  |
Business Acquisition, Goodwill, Expected Tax Deductible Amount |  |  |  |  |  |  |  |  | 21,000 |  |  |  | 21,000 |  |  |
All 2017 Acquisitions [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating income |  |  |  |  |  |  |  |  | 2,000 |  |  |  |  |  |  |
Goodwill, Acquired During Period |  |  |  |  |  |  |  |  | 307,000 |  |  |  |  |  |  |
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual |  |  |  |  |  |  |  |  | 227,000 |  |  |  |  |  |  |
Andrew Page |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total acquisition date fair value of the consideration for acquisitions |  |  |  |  |  |  |  |  |  | £ 16 | $ 20,000 |  |  |  |  |
Gains on bargain purchases |  |  |  |  |  |  |  |  | $ 2,000 |  | $ 8,000 |  | 10,000 |  |  |
Required divestiture of branches due to Governmental review of the acquisition |  |  |  |  |  |  |  |  |  | 10.00% | 10.00% |  |  |  |  |
Specialty |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of acquisitions |  |  |  |  |  |  |  |  | 4 |  |  |  |  |  |  |
Aftermarket Parts Distribution Businesses In Europe [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Effective Date of Acquisition |  | Jul. 30, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of acquisitions |  |  |  |  |  |  |  | 4 |  |  |  |  |  |  |  |
Payment To Former Owners [Member] | All 2018 Acquisitions excluding Stahlgruber [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration liabilities |  |  |  |  |  |  |  | $ (3,000) |  |  |  |  |  |  |  |
Payment To Former Owners [Member] | All 2019 Acquisitions excluding Stahlgruber Czech Republic Wholesale Business [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration liabilities |  |  |  |  |  |  | (7,000) |  |  |  |  |  |  |  |  |
Payment To Former Owners [Member] | 2017 acquisitions and adjustments to 2016 acquisitions [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration liabilities |  |  |  |  |  |  |  |  | $ (6,000) |  |  |  | (6,000) |  |  |
Payment To Former Owners [Member] | Maximum [Member] | All 2018 Acquisitions excluding Stahlgruber [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration liabilities |  |  |  |  |  |  |  | (5,000) |  |  |  |  |  |  |  |
Payment To Former Owners [Member] | Maximum [Member] | All 2019 Acquisitions excluding Stahlgruber Czech Republic Wholesale Business [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration liabilities |  |  |  |  |  |  | (8,000) |  |  |  |  |  |  |  |  |
Payment To Former Owners [Member] | Maximum [Member] | 2017 acquisitions and adjustments to 2016 acquisitions [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration liabilities |  |  |  |  |  |  |  |  | (19,000) |  |  |  | (19,000) |  |  |
Non-interest Bearing [Member] | 2017 acquisitions and adjustments to 2016 acquisitions [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration liabilities |  |  |  |  |  |  |  |  | (5,000) |  |  |  | $ (5,000) |  |  |
Specialty |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  | $ 1,464,042 | $ 1,477,680 | $ 1,305,516 |  |  |  |  |  |  |

X
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- Definition In a business combination in which the amount of net identifiable assets acquired and liabilities assumed exceeds the aggregate consideration transferred or to be transferred (as defined), this element represents the amount of gain recognized by the entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=116859721&loc=d3e6571-128477 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (f)(1) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6387-128476 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6396-128476 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=116859721&loc=d3e6527-128477 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6393-128476 + Details
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