Revenue from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Disaggregation of Revenue
Revenue	$ 9,101,641	$ 7,027,476	$ 5,206,760
Percentage of revenue from contract with customer (as a percent)	100.00%	100.00%	100.00%
New Construction
Disaggregation of Revenue
Revenue	$ 5,752,786	$ 3,984,529	$ 2,853,239
Percentage of revenue from contract with customer (as a percent)	63.20%	56.70%	54.80%
Existing Building Construction
Disaggregation of Revenue
Revenue	$ 2,118,363	$ 1,945,093	$ 1,337,023
Percentage of revenue from contract with customer (as a percent)	23.30%	27.70%	25.60%
Service Projects
Disaggregation of Revenue
Revenue	$ 568,845	$ 468,950	$ 446,151
Percentage of revenue from contract with customer (as a percent)	6.20%	6.70%	8.60%
Service Calls, Maintenance and Monitoring
Disaggregation of Revenue
Revenue	$ 661,647	$ 628,904	$ 570,347
Percentage of revenue from contract with customer (as a percent)	7.30%	8.90%	11.00%
Technology
Disaggregation of Revenue
Revenue	$ 4,098,854	$ 2,331,362	$ 1,114,382
Percentage of revenue from contract with customer (as a percent)	45.00%	33.20%	21.40%
Manufacturing
Disaggregation of Revenue
Revenue	$ 2,011,607	$ 1,919,403	$ 1,751,684
Percentage of revenue from contract with customer (as a percent)	22.10%	27.30%	33.60%
Healthcare
Disaggregation of Revenue
Revenue	$ 810,646	$ 584,902	$ 554,906
Percentage of revenue from contract with customer (as a percent)	8.90%	8.30%	10.60%
Education
Disaggregation of Revenue
Revenue	$ 665,266	$ 702,706	$ 493,982
Percentage of revenue from contract with customer (as a percent)	7.30%	10.00%	9.50%
Government
Disaggregation of Revenue
Revenue	$ 457,329	$ 375,201	$ 301,837
Percentage of revenue from contract with customer (as a percent)	5.00%	5.40%	5.80%
Office Buildings
Disaggregation of Revenue
Revenue	$ 446,659	$ 424,343	$ 400,754
Percentage of revenue from contract with customer (as a percent)	5.00%	6.00%	7.70%
Retail, Restaurants and Entertainment
Disaggregation of Revenue
Revenue	$ 337,590	$ 377,302	$ 310,381
Percentage of revenue from contract with customer (as a percent)	3.70%	5.40%	6.00%
Multi-Family and Residential
Disaggregation of Revenue
Revenue	$ 130,578	$ 142,133	$ 181,780
Percentage of revenue from contract with customer (as a percent)	1.40%	2.00%	3.50%
Other
Disaggregation of Revenue
Revenue	$ 143,112	$ 170,124	$ 97,054
Percentage of revenue from contract with customer (as a percent)	1.60%	2.40%	1.90%
Mechanical Segment
Disaggregation of Revenue
Revenue	$ 6,673,745	$ 5,527,604	$ 3,946,022
Percentage of revenue from contract with customer (as a percent)	73.30%	78.70%	75.80%
Electrical Segment
Disaggregation of Revenue
Revenue	$ 2,427,896	$ 1,499,872	$ 1,260,738
Percentage of revenue from contract with customer (as a percent)	26.70%	21.30%	24.20%

Disaggregation of Revenue