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Goodwill and Identifiable Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2018
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, 2018 and 2017 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, 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 |
Intersegment 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 |
Acquisitions, sales and purchase price adjustments | 7,500 |  |  | 56 |  |  | 18,438 |  |  | — |  |  | 25,994 |
Balance at December 31, 2018 | $ | 133,207 |  |  | $ | 256,321 |  |  | $ | 274,171 |  |  | $ | 327,188 |  |  | $ | 990,887 |
Schedule of Intangible Assets | Identifiable intangible assets as of December 31, 2018 and 2017 consist of the following (in thousands):
| December 31, 2018
| Gross Carrying Amount |  | Accumulated Amortization |  | Accumulated Impairment Charge |  | Total
Contract backlog | $ | 58,945 |  |  | $ | (56,812 | ) |  | $ | — |  |  | $ | 2,133 |
Developed technology/Vendor network | 95,661 |  |  | (55,318 | ) |  | — |  |  | 40,343 |
Customer relationships | 522,855 |  |  | (240,073 | ) |  | (4,834 | ) |  | 277,948 |
Non-competition agreements | 10,220 |  |  | (10,220 | ) |  | — |  |  | — |
Trade names (amortized) | 31,148 |  |  | (20,893 | ) |  | — |  |  | 10,255 |
Trade names (unamortized) | 209,840 |  |  | — |  |  | (52,233 | ) |  | 157,607 |
Total | $ | 928,669 |  |  | $ | (383,316 | ) |  | $ | (57,067 | ) |  | $ | 488,286 |
| 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 |
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):
2019 | $ | 42,315 |
2020 | 40,000 |
2021 | 39,207 |
2022 | 37,003 |
2023 | 36,065 |
Thereafter | 136,089 |
| $ | 330,679 |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13854-109267 + Details
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