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Goodwill, Identifiable Intangible Assets, And Other Long-Lived Assets (Tables) | 12 Months Ended
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Dec. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Goodwill | The changes in the carrying amount of goodwill by reportable segment during the years ended December 31, 2021 and 2020 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, 2019 | $ | 142,545 |  |  | $ | 299,220 |  |  | $ | 289,158 |  |  | $ | 332,988 |  |  | $ | 1,063,911 |
Acquisitions and purchase price adjustments | — |  |  | 398 |  |  | 12,974 |  |  | — |  |  | 13,372 |
Impairment | — |  |  | — |  |  | — |  |  | (225,500) |  |  | (225,500) |
Balance at December 31, 2020 | 142,545 |  |  | 299,618 |  |  | 302,132 |  |  | 107,488 |  |  | 851,783 |
Acquisitions and purchase price adjustments | 24,467 |  |  | 4,269 |  |  | 9,749 |  |  | — |  |  | 38,485 |
Intersegment transfers | (7,500) |  |  | — |  |  | 900 |  |  | 6,600 |  |  | — |
Balance at December 31, 2021 | $ | 159,512 |  |  | $ | 303,887 |  |  | $ | 312,781 |  |  | $ | 114,088 |  |  | $ | 890,268 |
Schedule of Intangible Assets | Identifiable intangible assets as of December 31, 2021 and 2020 consisted of the following (in thousands):
| December 31, 2021
| Gross Carrying Amount |  | Accumulated Amortization |  | Accumulated Impairment Charge |  | Total
Customer relationships | $ | 717,666 |  |  | $ | (374,764) |  |  | $ | (4,834) |  |  | $ | 338,068 |
Trade names (unamortized) | 274,721 |  |  | — |  |  | (58,933) |  |  | 215,788 |
Developed technology/Vendor network | 95,661 |  |  | (69,688) |  |  | — |  |  | 25,973 |
Trade names (amortized) | 32,366 |  |  | (24,180) |  |  | — |  |  | 8,186 |
Contract backlog | 77,995 |  |  | (76,645) |  |  | — |  |  | 1,350 |
Total | $ | 1,198,409 |  |  | $ | (545,277) |  |  | $ | (63,767) |  |  | $ | 589,365 |
| December 31, 2020
| Gross Carrying Amount |  | Accumulated Amortization |  | Accumulated Impairment Charge |  | Total
Customer relationships | $ | 670,155 |  |  | $ | (324,426) |  |  | $ | (4,834) |  |  | $ | 340,895 |
Trade names (unamortized) | 258,471 |  |  | — |  |  | (58,933) |  |  | 199,538 |
Developed technology/Vendor network | 95,661 |  |  | (64,994) |  |  | — |  |  | 30,667 |
Trade names (amortized) | 31,516 |  |  | (23,002) |  |  | — |  |  | 8,514 |
Contract backlog | 72,045 |  |  | (68,766) |  |  | — |  |  | 3,279 |
Total | $ | 1,127,848 |  |  | $ | (481,188) |  |  | $ | (63,767) |  |  | $ | 582,893 |
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):
2022 | $ | 57,321 |
2023 | 54,891 |
2024 | 54,240 |
2025 | 53,158 |
2026 | 47,382 |
Thereafter | 106,585 |
| $ | 373,577 |

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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=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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