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Goodwill and Identifiable Intangible Assets - Schedule of Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Goodwill [Roll Forward]
Goodwill, Beginning balance	$ 834,102	$ 834,825
Acquisitions, sales and purchase price adjustments	9,068	(723)
Goodwill, Ending balance	843,170	834,102
United States electrical construction and facilities services segment
Goodwill [Roll Forward]
Goodwill, Beginning balance	3,823	3,823
Acquisitions, sales and purchase price adjustments	0	0
Goodwill, Ending balance	3,823	3,823
United States Mechanical Construction And Facilities Services
Goodwill [Roll Forward]
Goodwill, Beginning balance	217,255	217,255
Acquisitions, sales and purchase price adjustments	8,816	0
Goodwill, Ending balance	226,071	217,255
United States Building Services
Goodwill [Roll Forward]
Goodwill, Beginning balance	228,385	229,204
Acquisitions, sales and purchase price adjustments	252	(819)
Goodwill, Ending balance	228,637	228,385
United States Industrial Services
Goodwill [Roll Forward]
Goodwill, Beginning balance	384,639	384,543
Acquisitions, sales and purchase price adjustments	0	96
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
-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

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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

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

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+ References

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