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Goodwill and Other Intangible Assets - 2021 Acquisitions - Narrative (Details) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2021 USD ($) yr acquisition | Dec. 31, 2020 USD ($)
Business Acquisition [Line Items] |  |
Goodwill, net | $ 1,338,597 | $ 1,243,034
Electrical Transmission |  |
Business Acquisition [Line Items] |  |
Goodwill, net | $ 197,900 |
2021 Acquisitions |  |
Business Acquisition [Line Items] |  |
Business combinations, number of acquisitions | acquisition | 8 |
Total consideration transferred | $ 644,900 |
Amortizing intangible assets, weighted average useful life | 17 years |
Amortizing intangible assets | $ 367,200 |
Goodwill, net | 95,400 |
Business acquisition, goodwill, expected tax deductible amount | 75,000 |
Estimated fair value of contingent consideration | 40,000 |
Business combination, contingent consideration, current | 26,000 |
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 | 65,000 |
2021 Acquisitions | Electrical Transmission |  |
Business Acquisition [Line Items] |  |
Total consideration transferred | 452,000 |
Goodwill, net | $ 48,000 |
2021 Acquisitions | Minimum | Expected Term |  |
Business Acquisition [Line Items] |  |
Business combinations, contingent consideration, earn-out period (in years) | yr | 1 |
2021 Acquisitions | Maximum | Expected Term |  |
Business Acquisition [Line Items] |  |
Business combinations, contingent consideration, earn-out period (in years) | yr | 5 |
2021 Acquisitions | Customer Relationships |  |
Business Acquisition [Line Items] |  |
Amortizing intangible assets, weighted average useful life | 18 years |
2021 Acquisitions | Trade Names |  |
Business Acquisition [Line Items] |  |
Amortizing intangible assets, weighted average useful life | 17 years |
2021 Acquisitions | Customer Relationships And Trade Names |  |
Business Acquisition [Line Items] |  |
Amortizing intangible assets, weighted average useful life | 20 years |
Amortizing intangible assets | $ 282,000 |

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