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Acquisitions Of Businesses (Details) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 USD ($) Company | Dec. 31, 2020 USD ($) Company
Business Acquisition [Line Items] |  |
Number of businesses acquired | Company | 5 | 3
Goodwill | $ 888,303 | $ 851,783
2020 Acquisitions |  |
Business Acquisition [Line Items] |  |
Purchase price |  | 50,300
Working capital acquired |  | 3,000
Other net liabilities |  | 3,900
Goodwill |  | 13,100
Identifiable intangible assets |  | $ 38,100
2021 Acquisitions |  |
Business Acquisition [Line Items] |  |
Purchase price | 125,400 |
Working capital acquired | 23,100 |
Other net liabilities | 1,600 |
Goodwill | 36,400 |
Identifiable intangible assets | $ 67,500 |

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