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- Schedule of Goodwill (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2020 USD ($)
Goodwill [Roll Forward]
Goodwill, Beginning Balance	$ 1,063,911
Acquisitions and purchase price adjustments	8,497
Goodwill, impairments	(225,500)
Goodwill, Ending Balance	846,908
United States Electrical Construction And Facilities Services [Member]
Goodwill [Roll Forward]
Goodwill, Beginning Balance	142,545
Acquisitions and purchase price adjustments	0
Goodwill, impairments	0
Goodwill, Ending Balance	142,545
United States Mechanical Construction And Facilities Services [Member]
Goodwill [Roll Forward]
Goodwill, Beginning Balance	299,220
Acquisitions and purchase price adjustments	398
Goodwill, impairments	0
Goodwill, Ending Balance	299,618
United States Building Services [Member]
Goodwill [Roll Forward]
Goodwill, Beginning Balance	289,158
Acquisitions and purchase price adjustments	8,099
Goodwill, impairments	0
Goodwill, Ending Balance	297,257
United States Industrial Services [Member]
Goodwill [Roll Forward]
Goodwill, Beginning Balance	332,988
Acquisitions and purchase price adjustments	0
Goodwill, impairments	(225,500)
Goodwill, Ending Balance	$ 107,488

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://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(10)(1))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

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-Topic 350
-SubTopic 20
-Section 45
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-SubTopic 20
-Section 45
-Paragraph 1
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- Definition

Amount of loss from the write-down 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
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 2
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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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-Topic 350
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