Revenue from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Disaggregation of Revenue
Revenue	$ 1,812,366	$ 1,378,124	$ 5,159,672	$ 3,849,194
Percentage of revenue from contract with customer (as a percent)	100.00%	100.00%	100.00%	100.00%
New Construction
Disaggregation of Revenue
Revenue	$ 949,035	$ 798,289	$ 2,930,283	$ 2,108,153
Percentage of revenue from contract with customer (as a percent)	52.40%	57.90%	56.80%	54.80%
Existing Building Construction
Disaggregation of Revenue
Revenue	$ 570,288	$ 305,795	$ 1,407,231	$ 974,085
Percentage of revenue from contract with customer (as a percent)	31.50%	22.20%	27.30%	25.30%
Service Projects
Disaggregation of Revenue
Revenue	$ 125,249	$ 117,202	$ 355,643	$ 335,053
Percentage of revenue from contract with customer (as a percent)	6.90%	8.50%	6.90%	8.70%
Service Calls, Maintenance and Monitoring
Disaggregation of Revenue
Revenue	$ 167,794	$ 156,838	$ 466,515	$ 431,903
Percentage of revenue from contract with customer (as a percent)	9.20%	11.40%	9.00%	11.20%
Technology
Disaggregation of Revenue
Revenue	$ 615,398	$ 303,847	$ 1,641,525	$ 795,327
Percentage of revenue from contract with customer (as a percent)	34.00%	22.00%	31.80%	20.70%
Manufacturing
Disaggregation of Revenue
Revenue	$ 452,157	$ 469,173	$ 1,439,772	$ 1,271,348
Percentage of revenue from contract with customer (as a percent)	24.90%	34.00%	27.90%	33.00%
Education
Disaggregation of Revenue
Revenue	$ 195,737	$ 139,206	$ 523,153	$ 376,637
Percentage of revenue from contract with customer (as a percent)	10.80%	10.10%	10.10%	9.80%
Healthcare
Disaggregation of Revenue
Revenue	$ 149,974	$ 133,130	$ 424,450	$ 431,329
Percentage of revenue from contract with customer (as a percent)	8.30%	9.70%	8.20%	11.20%
Office Buildings
Disaggregation of Revenue
Revenue	$ 109,233	$ 104,937	$ 326,137	$ 299,103
Percentage of revenue from contract with customer (as a percent)	6.00%	7.60%	6.30%	7.80%
Retail, Restaurants and Entertainment
Disaggregation of Revenue
Revenue	$ 114,572	$ 77,802	$ 309,658	$ 234,779
Percentage of revenue from contract with customer (as a percent)	6.30%	5.60%	6.00%	6.10%
Government
Disaggregation of Revenue
Revenue	$ 92,555	$ 85,220	$ 271,429	$ 227,232
Percentage of revenue from contract with customer (as a percent)	5.10%	6.30%	5.30%	5.90%
Multi-Family and Residential
Disaggregation of Revenue
Revenue	$ 33,838	$ 45,523	$ 110,870	$ 136,825
Percentage of revenue from contract with customer (as a percent)	1.90%	3.30%	2.20%	3.50%
Other Customer
Disaggregation of Revenue
Revenue	$ 48,902	$ 19,286	$ 112,678	$ 76,614
Percentage of revenue from contract with customer (as a percent)	2.70%	1.40%	2.20%	2.00%
Mechanical Segment
Disaggregation of Revenue
Revenue	$ 1,438,617	$ 1,031,310	$ 4,075,305	$ 2,925,848
Percentage of revenue from contract with customer (as a percent)	79.40%	74.80%	79.00%	76.00%
Electrical Segment
Disaggregation of Revenue
Revenue	$ 373,749	$ 346,814	$ 1,084,367	$ 923,346
Percentage of revenue from contract with customer (as a percent)	20.60%	25.20%	21.00%	24.00%