Revenue from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Disaggregation of Revenue
Revenue	$ 7,027,476	$ 5,206,760	$ 4,140,364
Percentage of revenue from contract with customer (as a percent)	100.00%	100.00%	100.00%
New Construction
Disaggregation of Revenue
Revenue	$ 3,984,529	$ 2,853,239	$ 2,011,992
Percentage of revenue from contract with customer (as a percent)	56.70%	54.80%	48.60%
Existing Building Construction
Disaggregation of Revenue
Revenue	$ 1,945,093	$ 1,337,023	$ 1,210,512
Percentage of revenue from contract with customer (as a percent)	27.70%	25.60%	29.20%
Service Projects
Disaggregation of Revenue
Revenue	$ 468,950	$ 446,151	$ 382,155
Percentage of revenue from contract with customer (as a percent)	6.70%	8.60%	9.20%
Service Calls, Maintenance and Monitoring
Disaggregation of Revenue
Revenue	$ 628,904	$ 570,347	$ 535,705
Percentage of revenue from contract with customer (as a percent)	8.90%	11.00%	13.00%
Technology
Disaggregation of Revenue
Revenue	$ 2,331,362	$ 1,114,382	$ 546,290
Percentage of revenue from contract with customer (as a percent)	33.20%	21.40%	13.20%
Manufacturing
Disaggregation of Revenue
Revenue	$ 1,919,403	$ 1,751,684	$ 1,426,962
Percentage of revenue from contract with customer (as a percent)	27.30%	33.60%	34.50%
Education
Disaggregation of Revenue
Revenue	$ 702,706	$ 493,982	$ 445,638
Percentage of revenue from contract with customer (as a percent)	10.00%	9.50%	10.80%
Healthcare
Disaggregation of Revenue
Revenue	$ 584,902	$ 554,906	$ 584,023
Percentage of revenue from contract with customer (as a percent)	8.30%	10.60%	14.10%
Office Buildings
Disaggregation of Revenue
Revenue	$ 424,343	$ 400,754	$ 349,235
Percentage of revenue from contract with customer (as a percent)	6.00%	7.70%	8.40%
Retail, Restaurants and Entertainment
Disaggregation of Revenue
Revenue	$ 377,302	$ 310,381	$ 311,697
Percentage of revenue from contract with customer (as a percent)	5.40%	6.00%	7.50%
Government
Disaggregation of Revenue
Revenue	$ 375,201	$ 301,837	$ 255,314
Percentage of revenue from contract with customer (as a percent)	5.40%	5.80%	6.20%
Multi-Family and Residential
Disaggregation of Revenue
Revenue	$ 142,133	$ 181,780	$ 126,339
Percentage of revenue from contract with customer (as a percent)	2.00%	3.50%	3.00%
Other
Disaggregation of Revenue
Revenue	$ 170,124	$ 97,054	$ 94,866
Percentage of revenue from contract with customer (as a percent)	2.40%	1.90%	2.30%
Mechanical Segment
Disaggregation of Revenue
Revenue	$ 5,527,604	$ 3,946,022	$ 3,178,475
Percentage of revenue from contract with customer (as a percent)	78.70%	75.80%	76.80%
Electrical Segment
Disaggregation of Revenue
Revenue	$ 1,499,872	$ 1,260,738	$ 961,889
Percentage of revenue from contract with customer (as a percent)	21.30%	24.20%	23.20%