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Goodwill, Identifiable Intangible Assets, and Other Long-Lived Assets (Tables) | 9 Months Ended
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Sep. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Goodwill | The changes in the carrying amount of goodwill by reportable segments were as follows during the nine months ended September 30, 2020 (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, 2019 | $ | 142,545 |  |  | $ | 299,220 |  |  | $ | 289,158 |  |  | $ | 332,988 |  |  | $ | 1,063,911 |
Acquisitions and purchase price adjustments | — |  |  | 398 |  |  | 8,099 |  |  | — |  |  | 8,497 |
Impairments | — |  |  | — |  |  | — |  |  | (225,500) |  |  | (225,500) |
Balance at September 30, 2020 | $ | 142,545 |  |  | $ | 299,618 |  |  | $ | 297,257 |  |  | $ | 107,488 |  |  | $ | 846,908 |
Schedule of Intangible Assets | Identifiable intangible assets consist of the following as of September 30, 2020 and December 31, 2019 (in thousands):
| September 30, 2020 |  |  |  |  |  |
| Gross Carrying Amount |  | Accumulated Amortization |  | Accumulated Impairment Charge |  | Total
Contract backlog | $ | 72,045 |  |  | $ | (67,199) |  |  | $ | — |  |  | $ | 4,846 |
Developed technology/Vendor network | 95,661 |  |  | (63,784) |  |  | — |  |  | 31,877 |
Customer relationships | 668,755 |  |  | (312,437) |  |  | (4,834) |  |  | 351,484 |
Trade names (amortized) | 31,348 |  |  | (22,583) |  |  | — |  |  | 8,765 |
Trade names (unamortized) | 258,640 |  |  | — |  |  | (58,933) |  |  | 199,707 |
Total | $ | 1,126,449 |  |  | $ | (466,003) |  |  | $ | (63,767) |  |  | $ | 596,679 |
| December 31, 2019 |  |  |  |  |  |
| Gross Carrying Amount |  | Accumulated Amortization |  | Accumulated Impairment Charge |  | Total
Contract backlog | $ | 66,745 |  |  | $ | (61,651) |  |  | $ | — |  |  | $ | 5,094 |
Developed technology/Vendor network | 95,661 |  |  | (60,156) |  |  | — |  |  | 35,505 |
Customer relationships | 644,755 |  |  | (277,601) |  |  | (4,834) |  |  | 362,320 |
Trade names (amortized) | 31,148 |  |  | (21,830) |  |  | — |  |  | 9,318 |
Trade names (unamortized) | 251,440 |  |  | — |  |  | (52,233) |  |  | 199,207 |
Total | $ | 1,089,749 |  |  | $ | (421,238) |  |  | $ | (57,067) |  |  | $ | 611,444 |

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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. + 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=121556970&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=121556970&loc=d3e13854-109267 + Details
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