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Goodwill and Identifiable Intangible Assets, Net (Tables) | 12 Months Ended
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Dec. 31, 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) | ​ | ​ | 52,897 | ​ | ​ | 97,348 | ​ | ​ | 150,245
Balance at December 31, 2025 | ​ | $ | 654,409 | ​ | $ | 371,106 | ​ | $ | 1,025,515
Schedule of components of identifiable intangible assets | Identifiable intangible assets consist of the following (dollars in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Weighted-Average | ​ | December 31, 2025 | ​ | December 31, 2024
​ | ​ ​ ​ | Remaining Useful Lives | ​ ​ ​ | Gross Book | ​ ​ ​ | Accumulated | ​ ​ ​ | Gross Book | ​ ​ ​ | Accumulated
​ | ​ ​ ​ | in Years | ​ ​ ​ | Value | ​ ​ ​ | Amortization | ​ ​ ​ | Value | ​ ​ ​ | Amortization
Customer Relationships |  | 6.8 | ​ | $ | 636,734 | ​ | $ | (294,683) | ​ | $ | 550,518 | ​ | $ | (241,263)
Backlog |  | 1.4 | ​ |  | 24,148 | ​ | ​ | (10,300) | ​ |  | 54,918 | ​ |  | (40,328)
Trade Names |  | 17.8 | ​ |  | 177,746 | ​ | ​ | (48,477) | ​ |  | 151,561 | ​ |  | (40,989)
Total | ​ | ​ | ​ | $ | 838,628 | ​ | $ | (353,460) | ​ | $ | 756,997 | ​ | $ | (322,580)
Schedule of future amortization expense of identifiable intangible assets | As of December 31, 2025, future amortization expense of identifiable intangible assets was as follows (in thousands):
​ | ​ | ​ | ​ | ​
Year ending December 31— | ​ ​ ​ | ​ | ​ ​ ​ | ​
2026 | ​ | $ | 76,564 | ​
2027 | ​ |  | 65,826 | ​
2028 | ​ |  | 63,119 | ​
2029 | ​ | ​ | 56,852 | ​
2030 | ​ | ​ | 44,317 | ​
Thereafter | ​ |  | 178,490 | ​
Total | ​ | $ | 485,168 | ​
​

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- Definition Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name Accounting Standards Codification -Section 55 -Paragraph 40 -SubTopic 30 -Topic 350 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482640/350-30-55-40 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482665/350-30-50-2 + Details
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