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Goodwill, Identifiable Intangible Assets, And Other Long-Lived Assets - Schedule of Goodwill (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Goodwill [Roll Forward] |  |
Goodwill, Beginning balance | $ 956,549 | $ 919,151
Acquisitions | 61,866 | 37,398
Goodwill, intersegment transfers |  | 0
Goodwill, Ending balance | 1,018,415 | 956,549
United States Electrical Construction And Facilities Services |  |
Goodwill [Roll Forward] |  |
Goodwill, Beginning balance | 178,013 | 178,013
Acquisitions | 13,739 | 0
Goodwill, intersegment transfers |  | 0
Goodwill, Ending balance | 191,752 | 178,013
United States Mechanical Construction And Facilities Services |  |
Goodwill [Roll Forward] |  |
Goodwill, Beginning balance | 318,353 | 315,329
Acquisitions | 26,111 | 4,524
Goodwill, intersegment transfers |  | (1,500)
Goodwill, Ending balance | 344,464 | 318,353
United States Building Services |  |
Goodwill [Roll Forward] |  |
Goodwill, Beginning balance | 346,095 | 311,721
Acquisitions | 12,210 | 32,874
Goodwill, intersegment transfers |  | 1,500
Goodwill, Ending balance | 358,305 | 346,095
United States Industrial Services |  |
Goodwill [Roll Forward] |  |
Goodwill, Beginning balance | 114,088 | 114,088
Acquisitions | 9,806 | 0
Goodwill, intersegment transfers |  | 0
Goodwill, Ending balance | $ 123,894 | $ 114,088

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