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Goodwill, Identifiable Intangible Assets, And Other Long-Lived Assets - Schedule of Goodwill (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Goodwill [Roll Forward] |  |  |
Goodwill, Beginning balance | $ 919,151,000 | $ 890,268,000 |
Acquisitions | 37,398,000 | 28,883,000 |
Goodwill impairment | 0 | 0 | $ 0
Goodwill, intersegment transfers | 0 | 0 |
Goodwill, Ending balance | 956,549,000 | 919,151,000 | 890,268,000
United States Electrical Construction And Facilities Services |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, Beginning balance | 178,013,000 | 159,512,000 |
Acquisitions | 0 | 17,601,000 |
Goodwill, intersegment transfers | 0 | 900,000 |
Goodwill, Ending balance | 178,013,000 | 178,013,000 | 159,512,000
United States Mechanical Construction And Facilities Services |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, Beginning balance | 315,329,000 | 303,887,000 |
Acquisitions | 4,524,000 | 6,942,000 |
Goodwill, intersegment transfers | (1,500,000) | 4,500,000 |
Goodwill, Ending balance | 318,353,000 | 315,329,000 | 303,887,000
United States Building Services |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, Beginning balance | 311,721,000 | 312,781,000 |
Acquisitions | 32,874,000 | 4,340,000 |
Goodwill, intersegment transfers | 1,500,000 | (5,400,000) |
Goodwill, Ending balance | 346,095,000 | 311,721,000 | 312,781,000
United States Industrial Services |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, Beginning balance | 114,088,000 | 114,088,000 |
Acquisitions | 0 | 0 |
Goodwill, intersegment transfers | 0 | 0 |
Goodwill, Ending balance | $ 114,088,000 | $ 114,088,000 | $ 114,088,000

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