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Goodwill and Identifiable Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Goodwill | The changes in the carrying amount of goodwill by reportable segments during the years ended December 31, 2017 and 2016 were as follows (in thousands):
| United States electrical construction and facilities services segment |  | United States mechanical construction and facilities services segment |  | United States building services segment |  | United States industrial services segment |  | Total
Balance at December 31, 2015 | $ | 3,823 |  |  | $ | 226,071 |  |  | $ | 228,637 |  |  | $ | 384,639 |  |  | $ | 843,170 |
Acquisitions, sales and purchase price adjustments | 119,777 |  |  | 525 |  |  | 16,156 |  |  | — |  |  | 136,458 |
Balance at December 31, 2016 | 123,600 |  |  | 226,596 |  |  | 244,793 |  |  | 384,639 |  |  | 979,628 |
Acquisitions, sales and purchase price adjustments | 2,107 |  |  | 30,969 |  |  | 9,640 |  |  | — |  |  | 42,716 |
Transfers | — |  |  | (1,300 | ) |  | 1,300 |  |  | — |  |  | — |
Impairment | — |  |  | — |  |  | — |  |  | (57,451 | ) |  | (57,451 | )
Balance at December 31, 2017 | $ | 125,707 |  |  | $ | 256,265 |  |  | $ | 255,733 |  |  | $ | 327,188 |  |  | $ | 964,893 |
Schedule of Intangible Assets | Identifiable intangible assets as of December 31, 2017 and 2016 consist of the following (in thousands):
| December 31, 2017
| Gross Carrying Amount |  | Accumulated Amortization |  | Accumulated Impairment Charge |  | Total
Contract backlog | $ | 55,545 |  |  | $ | (55,229 | ) |  | $ | — |  |  | $ | 316 |
Developed technology/Vendor network | 95,661 |  |  | (50,479 | ) |  | — |  |  | 45,182 |
Customer relationships | 500,756 |  |  | (206,319 | ) |  | (4,834 | ) |  | 289,603 |
Non-competition agreements | 10,220 |  |  | (10,178 | ) |  | — |  |  | 42 |
Trade names (amortized) | 32,848 |  |  | (19,461 | ) |  | — |  |  | 13,387 |
Trade names (unamortized) | 198,739 |  |  | — |  |  | (52,233 | ) |  | 146,506 |
Total | $ | 893,769 |  |  | $ | (341,666 | ) |  | $ | (57,067 | ) |  | $ | 495,036 |
| December 31, 2016
| Gross Carrying Amount |  | Accumulated Amortization |  | Accumulated Impairment Charge |  | Total
Contract backlog | $ | 48,645 |  |  | $ | (48,412 | ) |  | $ | — |  |  | $ | 233 |
Developed technology/Vendor network | 95,661 |  |  | (45,616 | ) |  | — |  |  | 50,045 |
Customer relationships | 466,556 |  |  | (173,156 | ) |  | (4,834 | ) |  | 288,566 |
Non-competition agreements | 10,220 |  |  | (10,041 | ) |  | — |  |  | 179 |
Trade names (amortized) | 32,848 |  |  | (15,847 | ) |  | — |  |  | 17,001 |
Trade names (unamortized) | 183,239 |  |  | — |  |  | (51,865 | ) |  | 131,374 |
Total | $ | 837,169 |  |  | $ | (293,072 | ) |  | $ | (56,699 | ) |  | $ | 487,398 |
Schedule of Estimated Future Amortization Expense | The following table presents the estimated future amortization expense of identifiable intangible assets in the following years (in thousands):
2018 | $ | 40,579 |
2019 | 38,281 |
2020 | 38,100 |
2021 | 37,306 |
2022 | 35,103 |
Thereafter | 159,161 |
| $ | 348,530 |

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- Definition Tabular disclosure of finite and indefinite lived intangible assets, in total and by major class, including the gross carrying amount and accumulated amortization. A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company. + References No definition available. + Details
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- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + 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 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267 + Details
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- Definition Tabular disclosure of the amount of amortization expense expected to be recorded in succeeding fiscal years for finite-lived intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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