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Goodwill, Identifiable Intangible Assets, And Other Long-Lived Assets - Schedule of Goodwill (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Goodwill [Roll Forward] |  |  |
Goodwill, Beginning balance | $ 1,063,911,000 | $ 990,887,000 |
Acquisitions and purchase price adjustments | 13,372,000 | 73,024,000 |
Goodwill, intersegment transfers |  | 0 |
Goodwill impairment | (225,500,000) | 0 | $ 0
Goodwill, Ending balance | 851,783,000 | 1,063,911,000 | 990,887,000
United States electrical construction and facilities services segment |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, Beginning balance | 142,545,000 | 133,207,000 |
Acquisitions and purchase price adjustments | 0 | 9,338,000 |
Goodwill, intersegment transfers |  | 0 |
Goodwill impairment | 0 |  |
Goodwill, Ending balance | 142,545,000 | 142,545,000 | 133,207,000
United States Mechanical Construction And Facilities Services |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, Beginning balance | 299,220,000 | 256,321,000 |
Acquisitions and purchase price adjustments | 398,000 | 48,699,000 |
Goodwill, intersegment transfers |  | (5,800,000) |
Goodwill impairment | 0 |  |
Goodwill, Ending balance | 299,618,000 | 299,220,000 | 256,321,000
United States Building Services |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, Beginning balance | 289,158,000 | 274,171,000 |
Acquisitions and purchase price adjustments | 12,974,000 | 14,987,000 |
Goodwill, intersegment transfers |  | 0 |
Goodwill impairment | 0 |  |
Goodwill, Ending balance | 302,132,000 | 289,158,000 | 274,171,000
United States Industrial Services |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, Beginning balance | 332,988,000 | 327,188,000 |
Acquisitions and purchase price adjustments | 0 | 0 |
Goodwill, intersegment transfers |  | 5,800,000 |
Goodwill impairment | (225,500,000) |  |
Goodwill, Ending balance | $ 107,488,000 | $ 332,988,000 | $ 327,188,000

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