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Acquisitions Of Businesses (Details) $ in Thousands |  |  |  |  |  |  |  |  |  | 9 Months Ended | 10 Months Ended |
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Sep. 16, 2019 Company | Aug. 01, 2019 Company | May 10, 2019 Company | Apr. 01, 2019 Company | Jan. 04, 2019 Company | Nov. 01, 2018 Company | Oct. 02, 2018 Company | May 03, 2018 Company | Apr. 04, 2018 Company | Sep. 30, 2019 USD ($) | Nov. 01, 2018 USD ($) | Dec. 31, 2018 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  | $ 1,019,590 |  | $ 990,887
Number of businesses acquired | Company | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |  |  |
2019 Acquisitions |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Purchase price |  |  |  |  |  |  |  |  |  | 83,600 |  |
Working capital acquired |  |  |  |  |  |  |  |  |  | 25,300 |  |
Other net assets |  |  |  |  |  |  |  |  |  | 1,000 |  |
Goodwill |  |  |  |  |  |  |  |  |  | 28,300 |  |
Identifiable intangible assets |  |  |  |  |  |  |  |  |  | $ 29,000 |  |
2018 Acquisitions |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Purchase price |  |  |  |  |  |  |  |  |  |  | $ 71,600 |
Working capital acquired |  |  |  |  |  |  |  |  |  |  |  | 8,700
Goodwill |  |  |  |  |  |  |  |  |  |  |  | 26,300
Identifiable intangible assets |  |  |  |  |  |  |  |  |  |  |  | $ 36,600

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- Definition The amount of acquisition cost of a business combination allocated to working capital. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of intangible assets, excluding goodwill, acquired at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=116869197&loc=d3e4845-128472 + Details
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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266 + Details
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