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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

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
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- Definition

Amount of increase (decrease) of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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- Definition

Amount of transfers into (out of) an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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-Publisher FASB
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-Topic 350
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-Paragraph 1
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