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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

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- 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 + Details
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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 + Details
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