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Goodwill and Identifiable Intangible Assets, Net (Tables) | 9 Months Ended
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Sep. 30, 2025
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of changes in the carrying amount of goodwill | The changes in the carrying amount of goodwill are as follows (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Mechanical Segment |  | Electrical Segment |  | Total
Balance at December 31, 2023 | ​ | $ | 393,276 | ​ | $ | 273,558 | ​ | $ | 666,834
Acquisitions and purchase price adjustments (See Note 5) | ​ |  | 208,236 | ​ | ​ | 200 | ​ | ​ | 208,436
Balance at December 31, 2024 | ​ | ​ | 601,512 | ​ | ​ | 273,758 | ​ | ​ | 875,270
Acquisitions and purchase price adjustments (See Note 5) | ​ | ​ | 52,898 | ​ | ​ | — | ​ | ​ | 52,898
Balance at September 30, 2025 | ​ | $ | 654,410 | ​ | $ | 273,758 | ​ | $ | 928,168
Schedule of future amortization expense of identifiable intangible assets | At September 30, 2025, future amortization expense of identifiable intangible assets is as follows (in thousands): ​
​ | ​ | ​ | ​ | ​
Year ending December 31— |  | ​ |  | ​
2025 (remainder of the year) | ​ | $ | 16,828 | ​
2026 | ​ |  | 63,573 | ​
2027 | ​ |  | 59,706 | ​
2028 | ​ |  | 57,353 | ​
2029 | ​ | ​ | 51,086 | ​
Thereafter | ​ |  | 183,375 | ​
Total | ​ | $ | 431,921 | ​
​

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