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Goodwill, Identifiable Intangible Assets, And Other Long-Lived Assets (Tables) | 12 Months Ended
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Dec. 31, 2023
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, 2023 and 2022 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, 2021 | $ | 159,512 |  |  | $ | 303,887 |  |  | $ | 312,781 |  |  | $ | 114,088 |  |  | $ | 890,268 |
Acquisitions | 17,601 |  |  | 6,942 |  |  | 4,340 |  |  | — |  |  | 28,883 |
Intersegment transfers | 900 |  |  | 4,500 |  |  | (5,400) |  |  | — |  |  | — |
Balance at December 31, 2022 | 178,013 |  |  | 315,329 |  |  | 311,721 |  |  | 114,088 |  |  | 919,151 |
Acquisitions | — |  |  | 4,524 |  |  | 32,874 |  |  | — |  |  | 37,398 |
Intersegment transfers | — |  |  | (1,500) |  |  | 1,500 |  |  | — |  |  | — |
Balance at December 31, 2023 | $ | 178,013 |  |  | $ | 318,353 |  |  | $ | 346,095 |  |  | $ | 114,088 |  |  | $ | 956,549 |
Schedule of Intangible Assets | Identifiable intangible assets as of December 31, 2023 and 2022 consisted of the following (in thousands):
| December 31, 2023
| Gross Carrying Amount |  | Accumulated Amortization |  | Accumulated Impairment Charge |  | Total
Customer relationships | $ | 807,766 |  |  | $ | (482,594) |  |  | $ | (4,834) |  |  | $ | 320,338 |
Trade names (indefinite-lived) | 299,271 |  |  | — |  |  | (58,933) |  |  | 240,338 |
Developed technology/Vendor network | 95,661 |  |  | (78,788) |  |  | — |  |  | 16,873 |
Trade names (finite-lived) | 35,991 |  |  | (27,800) |  |  | — |  |  | 8,191 |
Contract backlog | 84,845 |  |  | (84,553) |  |  | — |  |  | 292 |
Total | $ | 1,323,534 |  |  | $ | (673,735) |  |  | $ | (63,767) |  |  | $ | 586,032 |
| December 31, 2022
| Gross Carrying Amount |  | Accumulated Amortization |  | Accumulated Impairment Charge |  | Total
Customer relationships | $ | 762,516 |  |  | $ | (427,211) |  |  | $ | (4,834) |  |  | $ | 330,471 |
Trade names (indefinite-lived) | 289,121 |  |  | — |  |  | (58,933) |  |  | 230,188 |
Developed technology/Vendor network | 95,661 |  |  | (74,238) |  |  | — |  |  | 21,423 |
Trade names (finite-lived) | 33,791 |  |  | (25,690) |  |  | — |  |  | 8,101 |
Contract backlog | 83,245 |  |  | (79,453) |  |  | — |  |  | 3,792 |
Total | $ | 1,264,334 |  |  | $ | (606,592) |  |  | $ | (63,767) |  |  | $ | 593,975 |
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):
2024 | $ | 63,873 |
2025 | 62,369 |
2026 | 55,782 |
2027 | 42,583 |
2028 | 33,818 |
Thereafter | 87,269 |
| $ | 345,694 |

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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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