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Goodwill, Identifiable Intangible Assets, And Other Long-Lived Assets - Schedule of Goodwill (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Goodwill [Roll Forward] |  |  |
Goodwill, Beginning balance | $ 851,783,000 | $ 1,063,911,000 |
Acquisitions and purchase price adjustments | 38,485,000 | 13,372,000 |
Goodwill impairment | 0 | (225,500,000) | $ 0
Goodwill, intersegment transfers | 0 |  |
Goodwill, Ending balance | 890,268,000 | 851,783,000 | 1,063,911,000
United States Electrical Construction And Facilities Services |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, Beginning balance | 142,545,000 | 142,545,000 |
Acquisitions and purchase price adjustments | 24,467,000 | 0 |
Goodwill impairment |  | 0 |
Goodwill, intersegment transfers | (7,500,000) |  |
Goodwill, Ending balance | 159,512,000 | 142,545,000 | 142,545,000
United States Mechanical Construction And Facilities Services |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, Beginning balance | 299,618,000 | 299,220,000 |
Acquisitions and purchase price adjustments | 4,269,000 | 398,000 |
Goodwill impairment |  | 0 |
Goodwill, intersegment transfers | 0 |  |
Goodwill, Ending balance | 303,887,000 | 299,618,000 | 299,220,000
United States Building Services |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, Beginning balance | 302,132,000 | 289,158,000 |
Acquisitions and purchase price adjustments | 9,749,000 | 12,974,000 |
Goodwill impairment |  | 0 |
Goodwill, intersegment transfers | 900,000 |  |
Goodwill, Ending balance | 312,781,000 | 302,132,000 | 289,158,000
United States Industrial Services |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, Beginning balance | 107,488,000 | 332,988,000 |
Acquisitions and purchase price adjustments | 0 | 0 |
Goodwill impairment |  | (225,500,000) |
Goodwill, intersegment transfers | 6,600,000 |  |
Goodwill, Ending balance | $ 114,088,000 | $ 107,488,000 | $ 332,988,000

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