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Goodwill and Identifiable Intangible Assets - Schedule of Goodwill (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Goodwill [Roll Forward] |  |
Goodwill, Beginning balance | $ 990,887 | $ 964,893
Acquisitions, sales and purchase price adjustments | 73,024 | 25,994
Goodwill, intersegment transfers | 0 |
Goodwill, Ending balance | 1,063,911 | 990,887
United States electrical construction and facilities services segment |  |
Goodwill [Roll Forward] |  |
Goodwill, Beginning balance | 133,207 | 125,707
Acquisitions, sales and purchase price adjustments | 9,338 | 7,500
Goodwill, intersegment transfers | 0 |
Goodwill, Ending balance | 142,545 | 133,207
United States Mechanical Construction And Facilities Services |  |
Goodwill [Roll Forward] |  |
Goodwill, Beginning balance | 256,321 | 256,265
Acquisitions, sales and purchase price adjustments | 48,699 | 56
Goodwill, intersegment transfers | (5,800) |
Goodwill, Ending balance | 299,220 | 256,321
United States Building Services |  |
Goodwill [Roll Forward] |  |
Goodwill, Beginning balance | 274,171 | 255,733
Acquisitions, sales and purchase price adjustments | 14,987 | 18,438
Goodwill, intersegment transfers | 0 |
Goodwill, Ending balance | 289,158 | 274,171
United States Industrial Services |  |
Goodwill [Roll Forward] |  |
Goodwill, Beginning balance | 327,188 | 327,188
Acquisitions, sales and purchase price adjustments | 0 | 0
Goodwill, intersegment transfers | 5,800 |
Goodwill, Ending balance | $ 332,988 | $ 327,188

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