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Revenue from Contracts with Customers (Tables) | 3 Months Ended
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Mar. 31, 2025
Revenue from Contracts with Customers |
Schedule of disaggregation of revenue | See details in the following tables (dollars in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended March 31, | ​ | ​
Revenue by Service Provided |  | 2025 | ​ |  | 2024 | ​ |
Mechanical Segment | ​ | $ | 1,402,215 |  | 76.6 | % | ​ | $ | 1,185,009 |  | 77.1 | % | ​
Electrical Segment | ​ | ​ | 429,071 | ​ | 23.4 | % | ​ | ​ | 352,007 | ​ | 22.9 | % | ​
Total | ​ | $ | 1,831,286 | ​ | 100.0 | % | ​ | $ | 1,537,016 | ​ | 100.0 | % | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended March 31, | ​ | ​
Revenue by Type of Customer | ​ | 2025 | ​ | ​ | 2024 |  | ​
Technology | ​ | $ | 677,553 | ​ | 37.0 | % | ​ | $ | 464,814 | ​ | 30.2 | % | ​
Manufacturing | ​ | ​ | 452,786 | ​ | 24.7 | % | ​ | ​ | 461,400 | ​ | 30.0 | % | ​
Healthcare | ​ | ​ | 182,542 | ​ | 10.0 | % | ​ | ​ | 133,729 | ​ | 8.7 | % | ​
Education | ​ | ​ | 161,242 | ​ | 8.8 | % | ​ | ​ | 133,983 | ​ | 8.7 | % | ​
Office Buildings | ​ | ​ | 122,526 | ​ | 6.7 | % | ​ | ​ | 101,892 | ​ | 6.6 | % | ​
Government | ​ | ​ | 96,281 | ​ | 5.3 | % | ​ | ​ | 87,801 | ​ | 5.7 | % | ​
Retail, Restaurants and Entertainment | ​ | ​ | 77,009 | ​ | 4.2 | % | ​ | ​ | 80,585 | ​ | 5.2 | % | ​
Multi-Family and Residential | ​ | ​ | 28,353 | ​ | 1.5 | % | ​ | ​ | 40,851 | ​ | 2.7 | % | ​
Other | ​ | ​ | 32,994 | ​ | 1.8 | % | ​ | ​ | 31,961 | ​ | 2.2 | % | ​
Total | ​ | $ | 1,831,286 | ​ | 100.0 | % | ​ | $ | 1,537,016 | ​ | 100.0 | % | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended March 31, | ​ | ​
Revenue by Activity Type | ​ | 2025 | ​ | ​ | 2024 |  | ​
New Construction | ​ | $ | 1,065,084 | ​ | 58.2 | % | ​ | $ | 898,976 | ​ | 58.5 | % | ​
Existing Building Construction | ​ | ​ | 492,603 | ​ | 26.9 | % | ​ | ​ | 390,369 | ​ | 25.4 | % | ​
Service Projects | ​ | ​ | 119,214 | ​ | 6.5 | % | ​ | ​ | 104,114 | ​ | 6.8 | % | ​
Service Calls, Maintenance and Monitoring | ​ | ​ | 154,385 | ​ | 8.4 | % | ​ | ​ | 143,557 | ​ | 9.3 | % | ​
Total | ​ | $ | 1,831,286 | ​ | 100.0 | % | ​ | $ | 1,537,016 | ​ | 100.0 | % | ​
​
Schedule of contract assets and liabilities | Contract assets and liabilities in the Consolidated Balance Sheet consisted of the following amounts as of March 31, 2025 and December 31, 2024 (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​
​ | March 31, 2025 | ​ | December 31, 2024
Contract assets: | ​ | ​ | ​ | ​ | ​
Costs and estimated earnings in excess of billings, less allowance for credit losses | $ | 227,678 | ​ | $ | 91,681
Contract liabilities: | ​ | ​ | ​ | ​ | ​
Billings in excess of costs and estimated earnings and deferred revenue | $ | 1,267,373 | ​ | $ | 1,149,257

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- Definition Tabular disclosure of receivable, contract asset, and contract liability from contract with customer. Includes, but is not limited to, change in contract asset and contract liability. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-10 + Details
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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-5 + Details
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