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Goodwill and Identifiable Intangible Assets - Schedule of Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Goodwill [Roll Forward]
Goodwill, Beginning balance	$ 843,170	$ 834,102
Acquisitions, sales and purchase price adjustments	136,458	9,068
Goodwill, Ending balance	979,628	843,170
United States electrical construction and facilities services segment
Goodwill [Roll Forward]
Goodwill, Beginning balance	3,823	3,823
Acquisitions, sales and purchase price adjustments	119,777	0
Goodwill, Ending balance	123,600	3,823
United States Mechanical Construction And Facilities Services
Goodwill [Roll Forward]
Goodwill, Beginning balance	226,071	217,255
Acquisitions, sales and purchase price adjustments	525	8,816
Goodwill, Ending balance	226,596	226,071
United States Building Services
Goodwill [Roll Forward]
Goodwill, Beginning balance	228,637	228,385
Acquisitions, sales and purchase price adjustments	16,156	252
Goodwill, Ending balance	244,793	228,637
United States Industrial Services
Goodwill [Roll Forward]
Goodwill, Beginning balance	384,639	384,639
Acquisitions, sales and purchase price adjustments	0	0
Goodwill, Ending balance	$ 384,639	$ 384,639

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/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=64834752&loc=SL49117168-202975

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X

- 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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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