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Acquisitions Of Businesses (Details) $ in Thousands |  |  |  |  |  |  |  |  |  | 10 Months Ended | 12 Months Ended |  |
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Nov. 01, 2018 Company | Oct. 02, 2018 Company | May 03, 2018 Company | Apr. 04, 2018 Company | Nov. 01, 2017 Company | Mar. 01, 2017 Company | Jan. 04, 2017 Company | Apr. 15, 2016 USD ($) Company | Apr. 01, 2016 Company | Nov. 01, 2018 USD ($) | Nov. 01, 2017 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  |  |  | $ 990,887 | $ 964,893 | $ 979,628
Amortization periods |  |  |  |  |  |  |  |  |  |  |  | 8 years 9 months |  |
Number of businesses acquired | Company | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |  |  |  |  |
2018 Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price |  |  |  |  |  |  |  |  |  | $ 71,300 |  |  |  |
Working capital acquired |  |  |  |  |  |  |  |  |  |  |  | $ 8,600 |  |
Other net assets |  |  |  |  |  |  |  |  |  |  |  | 200 |  |
Goodwill |  |  |  |  |  |  |  |  |  |  |  | 25,900 |  |
Identifiable intangible assets |  |  |  |  |  |  |  |  |  |  |  | $ 36,600 |  |
2017Acquisitions [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price |  |  |  |  |  |  |  |  |  |  | $ 111,900 |  |  |
Working capital acquired |  |  |  |  |  |  |  |  |  |  |  |  | 12,300 |
Other net assets |  |  |  |  |  |  |  |  |  |  |  |  | 2,300 |
Goodwill |  |  |  |  |  |  |  |  |  |  |  |  | 40,700 |
Identifiable intangible assets |  |  |  |  |  |  |  |  |  |  |  |  | $ 56,600 |
Ardent [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition, percentage of voting interests acquired |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |
Purchase price |  |  |  |  |  |  |  | $ 201,400 |  |  |  |  |  |
Working capital acquired |  |  |  |  |  |  |  | 34,100 |  |  |  |  |  |
Other net assets |  |  |  |  |  |  |  | 3,900 |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  | 121,900 |  |  |  |  |  |
Identifiable intangible assets |  |  |  |  |  |  |  | 41,500 |  |  |  |  |  |
Acquired goodwill, tax deductible amount |  |  |  |  |  |  |  | $ 99,700 |  |  |  |  |  |
Amortization periods |  |  |  |  |  |  |  |  |  |  |  | 13 years 6 months |  |

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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 Percentage of voting equity interests acquired at the acquisition date in the business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + 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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