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Goodwill and Other Intangible Assets - 2020 Acquisitions - Narrative (Details) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2020 USD ($) yr acquisition
Business Acquisition [Line Items] |  |  |  |
Cash, net of cash acquired | $ | $ 604,907 | $ 11,251 |  |
2020 Acquisitions |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business combinations, number of acquisitions | acquisition |  |  |  | 5
Cash, net of cash acquired | $ |  |  |  | $ 23,600
Estimated fair value of contingent consideration | $ |  |  |  | $ 8,300
Acquisition-related contingent consideration liabilities, range of potential undiscounted earn-out liabilities, low | $ | 2,000 |  |  |
Acquisition-related contingent consideration liabilities, range of potential undiscounted earn-out liabilities, high | $ | $ 17,000 |  |  |
2020 Acquisitions | Maximum | Expected Term |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business combinations, contingent consideration, earn-out period (in years) | yr |  |  |  | 5
2020 Acquisitions | Forecast |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Cash, net of cash acquired | $ |  |  | $ 3,100 |
2020 Acquisitions | Install to Home |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business combinations, number of acquisitions | acquisition |  |  |  | 1
2020 Acquisitions | Clean Energy and Infrastructure and Communications |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business combinations, number of acquisitions | acquisition |  |  |  | 2
2020 Acquisitions | Clean Energy and Infrastructure |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business combinations, percentage of interests acquired | 91.00% | 96.00% |  | 91.00%
2020 Acquisitions | Communications and Energy Infastructure |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business combinations, number of acquisitions | acquisition |  |  |  | 3
2020 Acquisitions | Communications |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business combinations, number of acquisitions | acquisition |  |  |  | 1
2020 Acquisitions | Electrical Transmission |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business combinations, number of acquisitions | acquisition |  |  |  | 1

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