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Goodwill and Identifiable Intangible Assets, Net (Tables) | 3 Months Ended
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Mar. 31, 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) | ​ | ​ | 1,833 | ​ | ​ | — | ​ | ​ | 1,833
Balance at March 31, 2022 | ​ | $ | 363,153 | ​ | $ | 230,794 | ​ | $ | 593,947
Schedule of future amortization expense of identifiable intangible assets | At March 31, 2022, future amortization expense of identifiable intangible assets is as follows (in thousands): ​
​ | ​ | ​ | ​ | ​
Year ending December 31— |  | ​ |  | ​
2022 (remainder of the year) |  | $ | 33,715 |
2023 | ​ | ​ | 34,532 | ​
2024 | ​ |  | 32,343 | ​
2025 | ​ |  | 30,156 | ​
2026 | ​ |  | 29,312 | ​
Thereafter | ​ |  | 131,932 | ​
Total | ​ | $ | 291,990 | ​

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