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Goodwill and Identifiable Intangible Assets - Schedule of Goodwill (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Goodwill [Roll Forward] |  |  |
Goodwill, Beginning balance | $ 964,893,000 | $ 979,628,000 |
Acquisitions, sales and purchase price adjustments | 25,994,000 | 42,716,000 |
Goodwill, intersegment transfers |  | 0 |
Goodwill, Impairment | 0 | (57,451,000) | $ 0
Goodwill, Ending balance | 990,887,000 | 964,893,000 | 979,628,000
United States electrical construction and facilities services segment |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, Beginning balance | 125,707,000 | 123,600,000 |
Acquisitions, sales and purchase price adjustments | 7,500,000 | 2,107,000 |
Goodwill, intersegment transfers |  | 0 |
Goodwill, Impairment |  | 0 |
Goodwill, Ending balance | 133,207,000 | 125,707,000 | 123,600,000
United States Mechanical Construction And Facilities Services |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, Beginning balance | 256,265,000 | 226,596,000 |
Acquisitions, sales and purchase price adjustments | 56,000 | 30,969,000 |
Goodwill, intersegment transfers |  | (1,300,000) |
Goodwill, Impairment |  | 0 |
Goodwill, Ending balance | 256,321,000 | 256,265,000 | 226,596,000
United States Building Services |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, Beginning balance | 255,733,000 | 244,793,000 |
Acquisitions, sales and purchase price adjustments | 18,438,000 | 9,640,000 |
Goodwill, intersegment transfers |  | 1,300,000 |
Goodwill, Impairment |  | 0 |
Goodwill, Ending balance | 274,171,000 | 255,733,000 | 244,793,000
United States Industrial Services |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, Beginning balance | 327,188,000 | 384,639,000 |
Acquisitions, sales and purchase price adjustments | 0 | 0 |
Goodwill, intersegment transfers |  | 0 |
Goodwill, Impairment |  | (57,451,000) |
Goodwill, Ending balance | $ 327,188,000 | $ 327,188,000 | $ 384,639,000

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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 Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13854-109267 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13777-109266 + Details
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