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Goodwill and Identifiable Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2016
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, 2016 and 2015 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, 2014 | $ | 3,823 |  |  | $ | 217,255 |  |  | $ | 228,385 |  |  | $ | 384,639 |  |  | $ | 834,102 |
Acquisitions, sales and purchase price adjustments | — |  |  | 8,816 |  |  | 252 |  |  | — |  |  | 9,068 |
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 |
Schedule of Intangible Assets | Identifiable intangible assets as of December 31, 2016 and 2015 consist of the following (in thousands):
| 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 |
| December 31, 2015
| Gross Carrying Amount |  | Accumulated Amortization |  | Accumulated Impairment Charge |  | Total
Contract backlog | $ | 47,745 |  |  | $ | (47,745 | ) |  | $ | — |  |  | $ | — |
Developed technology/Vendor network | 95,661 |  |  | (40,482 | ) |  | — |  |  | 55,179 |
Customer relationships | 430,356 |  |  | (141,695 | ) |  | (4,834 | ) |  | 283,827 |
Non-competition agreements | 10,220 |  |  | (9,832 | ) |  | — |  |  | 388 |
Trade names (amortized) | 21,248 |  |  | (12,410 | ) |  | — |  |  | 8,838 |
Trade names (unamortized) | 174,039 |  |  | — |  |  | (49,437 | ) |  | 124,602 |
Total | $ | 779,269 |  |  | $ | (252,164 | ) |  | $ | (54,271 | ) |  | $ | 472,834 |
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):
2017 | $ | 39,210 |
2018 | 36,808 |
2019 | 34,826 |
2020 | 34,645 |
2021 | 33,851 |
Thereafter | 176,684 |
| $ | 356,024 |

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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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