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Goodwill, Identifiable Intangible Assets, And Other Long-Lived Assets (Tables) | 12 Months Ended
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Dec. 31, 2024
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, 2024 and 2023 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, 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 |
Acquisitions | 13,739 |  |  | 26,111 |  |  | 12,210 |  |  | 9,806 |  |  | 61,866 |
Balance at December 31, 2024 | $ | 191,752 |  |  | $ | 344,464 |  |  | $ | 358,305 |  |  | $ | 123,894 |  |  | $ | 1,018,415 |
Schedule of Intangible Assets | Identifiable intangible assets as of December 31, 2024 and 2023 consisted of the following (in thousands):
| December 31, 2024
| Gross Carrying Amount |  | Accumulated Amortization |  | Accumulated Impairment Charge |  | Total
Customer relationships | $ | 902,216 |  |  | $ | (543,913) |  |  | $ | (4,834) |  |  | $ | 353,469 |
Trade names (indefinite-lived) | 330,271 |  |  | — |  |  | (58,933) |  |  | 271,338 |
Developed technology/Vendor network | 95,661 |  |  | (83,338) |  |  | — |  |  | 12,323 |
Trade names (finite-lived) | 38,491 |  |  | (30,026) |  |  | — |  |  | 8,465 |
Contract backlog | 96,045 |  |  | (93,460) |  |  | — |  |  | 2,585 |
Total | $ | 1,462,684 |  |  | $ | (750,737) |  |  | $ | (63,767) |  |  | $ | 648,180 |
| 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 |
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):
2025 | $ | 73,449 |
2026 | 63,594 |
2027 | 50,067 |
2028 | 40,996 |
2029 | 35,115 |
Thereafter | 113,621 |
| $ | 376,842 |

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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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