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Goodwill and Identifiable Intangible Assets, Net (Tables) | 9 Months Ended
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Sep. 30, 2022
Goodwill and Identifiable Intangible Assets, Net |
Schedule of changes in the carrying amount of goodwill | The changes in the carrying amount of goodwill are as follows (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Mechanical Services | ​ | Electrical Services | ​ | ​ | ​
​ |  | Segment |  | Segment | ​ | Total |
Balance at December 31, 2020 | ​ | $ | 307,448 | ​ | $ | 156,944 | ​ | $ | 464,392 | ​
Acquisitions and purchase price adjustments (See Note 5) | ​ |  | 52,771 | ​ | ​ | 74,951 | ​ | ​ | 127,722 | ​
Impact of segment reorganization | ​ | ​ | 1,101 | ​ | ​ | (1,101) | ​ | ​ | — | ​
Balance at December 31, 2021 | ​ | ​ | 361,320 | ​ | ​ | 230,794 | ​ | ​ | 592,114 | ​
Acquisitions and purchase price adjustments (See Note 5) | ​ | ​ | 1,859 | ​ | ​ | 17,066 | ​ | ​ | 18,925 | ​
Balance at September 30, 2022 | ​ | $ | 363,179 | ​ | $ | 247,860 | ​ | $ | 611,039 | ​
Schedule of future amortization expense of identifiable intangible assets | At September 30, 2022, future amortization expense of identifiable intangible assets is as follows (in thousands): ​
​ | ​ | ​ | ​ | ​
Year ending December 31— |  | ​ |  | ​
2022 (remainder of the year) |  | $ | 11,193 |
2023 | ​ | ​ | 36,252 | ​
2024 | ​ |  | 34,063 | ​
2025 | ​ |  | 31,876 | ​
2026 | ​ |  | 31,032 | ​
Thereafter | ​ |  | 140,678 | ​
Total | ​ | $ | 285,094 | ​

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