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Acquisitions Of Businesses (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 USD ($) Company | Dec. 31, 2022 USD ($) Company | Dec. 31, 2021 USD ($) Company
Business Acquisition [Line Items] |  |  |
Number of businesses acquired | Company | 8 | 6 | 8
Goodwill ascribed | $ 956,549 | $ 919,151 | $ 890,268
2022 Acquisitions |  |  |
Business Acquisition [Line Items] |  |  |
Purchase price |  | 100,800 |
Working capital acquired |  | 7,100 |
Other net liabilities acquired |  | 1,100 |
Goodwill ascribed |  | 28,900 |
Identifiable intangible assets ascribed |  | $ 65,900 |
2021 Acquisitions |  |  |
Business Acquisition [Line Items] |  |  |
Purchase price |  |  | 131,200
Working capital acquired |  |  | 22,900
Other net liabilities acquired |  |  | 600
Goodwill ascribed |  |  | 38,300
Identifiable intangible assets ascribed |  |  | 70,600
Goodwill and identifiable intangible assets, tax deductible amount |  |  | $ 90,500
2023 Acquisitions |  |  |
Business Acquisition [Line Items] |  |  |
Purchase price | 99,600 |  |
Working capital acquired | 9,100 |  |
Other net liabilities acquired | 6,100 |  |
Goodwill ascribed | 37,400 |  |
Identifiable intangible assets ascribed | 59,200 |  |
Goodwill and identifiable intangible assets, tax deductible amount | $ 29,600 |  |

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