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Goodwill and Other Intangible Assets (Rollforward of Goodwill by Segment) (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2018
Goodwill [Line Items] |  |  |  |
Goodwill, gross |  |  | $ 1,366,800 | $ 1,216,400
Goodwill, accumulated impairment loss |  |  | (123,800) | (116,000)
Goodwill, net | $ 1,221,440 | $ 1,100,400 | 1,243,034 | 1,100,400
Goodwill [Roll Forward] |  |  |  |
Goodwill, net, beginning balance | 1,221,440 | 1,100,400 |  |
Additions from new business combinations | 15,100 | 120,400 |  |
Measurement period adjustments, net | 6,100 | (100) |  |
Currency translation adjustments | 400 | 700 |  |
Goodwill, net, ending balance | 1,243,034 | 1,221,440 |  |
Communications [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill, gross |  |  | 562,100 | 467,800
Goodwill, accumulated impairment loss |  |  | 0 | 0
Goodwill, net | 562,100 | 541,300 | 562,100 | 467,800
Goodwill [Roll Forward] |  |  |  |
Goodwill, net, beginning balance | 541,300 | 467,800 |  |
Additions from new business combinations | 14,900 | 73,200 |  |
Measurement period adjustments, net | 5,900 | 300 |  |
Currency translation adjustments | 0 | 0 |  |
Goodwill, net, ending balance | 562,100 | 541,300 |  |
Clean Energy and Infrastructure |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill, gross |  |  | 152,700 | 143,100
Goodwill, accumulated impairment loss |  |  | 0 | 0
Goodwill, net | 152,700 | 152,600 | 152,700 | 143,100
Goodwill [Roll Forward] |  |  |  |
Goodwill, net, beginning balance | 152,600 | 143,100 |  |
Additions from new business combinations | 0 | 9,500 |  |
Measurement period adjustments, net | 100 | 0 |  |
Currency translation adjustments | 0 | 0 |  |
Goodwill, net, ending balance | 152,700 | 152,600 |  |
Oil and Gas [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill, gross |  |  | 501,900 | 455,600
Goodwill, accumulated impairment loss |  |  | (123,800) | (116,000)
Goodwill, net | 378,100 | 377,600 | 378,100 | 339,600
Goodwill [Roll Forward] |  |  |  |
Goodwill, net, beginning balance | 377,600 | 339,600 |  |
Additions from new business combinations | 0 | 37,700 |  |
Measurement period adjustments, net | 100 | (400) |  |
Currency translation adjustments | 400 | 700 |  |
Goodwill, net, ending balance | 378,100 | 377,600 |  |
Electrical Transmission [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill, gross |  |  | 150,100 | 149,900
Goodwill, accumulated impairment loss |  |  | 0 | 0
Goodwill, net | 150,100 | 149,900 | $ 150,100 | $ 149,900
Goodwill [Roll Forward] |  |  |  |
Goodwill, net, beginning balance | 149,900 | 149,900 |  |
Additions from new business combinations | 200 | 0 |  |
Measurement period adjustments, net | 0 | 0 |  |
Currency translation adjustments | 0 | 0 |  |
Goodwill, net, ending balance | $ 150,100 | $ 149,900 |  |

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