Revenue from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Disaggregation of Revenue
Revenue	$ 2,450,969	$ 1,812,366	$ 6,455,574	$ 5,159,672
Percentage of revenue from contract with customer (as a percent)	100.00%	100.00%	100.00%	100.00%
New Construction
Disaggregation of Revenue
Revenue	$ 1,597,452	$ 949,035	$ 3,919,402	$ 2,930,283
Percentage of revenue from contract with customer (as a percent)	65.20%	52.40%	60.70%	56.80%
Existing Building Construction
Disaggregation of Revenue
Revenue	$ 527,139	$ 570,288	$ 1,626,978	$ 1,407,231
Percentage of revenue from contract with customer (as a percent)	21.50%	31.50%	25.20%	27.30%
Service Projects
Disaggregation of Revenue
Revenue	$ 150,383	$ 125,249	$ 415,868	$ 355,643
Percentage of revenue from contract with customer (as a percent)	6.10%	6.90%	6.50%	6.90%
Service Calls, Maintenance and Monitoring
Disaggregation of Revenue
Revenue	$ 175,995	$ 167,794	$ 493,326	$ 466,515
Percentage of revenue from contract with customer (as a percent)	7.20%	9.20%	7.60%	9.00%
Technology
Disaggregation of Revenue
Revenue	$ 1,122,528	$ 615,398	$ 2,734,280	$ 1,641,525
Percentage of revenue from contract with customer (as a percent)	45.80%	34.00%	42.40%	31.80%
Manufacturing
Disaggregation of Revenue
Revenue	$ 543,110	$ 452,157	$ 1,468,936	$ 1,439,772
Percentage of revenue from contract with customer (as a percent)	22.20%	24.90%	22.70%	27.90%
Healthcare
Disaggregation of Revenue
Revenue	$ 206,965	$ 149,974	$ 589,848	$ 424,450
Percentage of revenue from contract with customer (as a percent)	8.50%	8.30%	9.10%	8.20%
Education
Disaggregation of Revenue
Revenue	$ 171,707	$ 195,737	$ 527,794	$ 523,153
Percentage of revenue from contract with customer (as a percent)	7.00%	10.80%	8.20%	10.10%
Office Buildings
Disaggregation of Revenue
Revenue	$ 125,458	$ 109,233	$ 358,445	$ 326,137
Percentage of revenue from contract with customer (as a percent)	5.10%	6.00%	5.50%	6.30%
Government
Disaggregation of Revenue
Revenue	$ 122,284	$ 92,555	$ 326,318	$ 271,429
Percentage of revenue from contract with customer (as a percent)	5.00%	5.10%	5.10%	5.30%
Retail, Restaurants and Entertainment
Disaggregation of Revenue
Revenue	$ 88,503	$ 114,572	$ 250,619	$ 309,658
Percentage of revenue from contract with customer (as a percent)	3.60%	6.30%	3.90%	6.00%
Multi-Family and Residential
Disaggregation of Revenue
Revenue	$ 35,342	$ 33,838	$ 96,909	$ 110,870
Percentage of revenue from contract with customer (as a percent)	1.40%	1.90%	1.50%	2.20%
Other
Disaggregation of Revenue
Revenue	$ 35,072	$ 48,902	$ 102,425	$ 112,678
Percentage of revenue from contract with customer (as a percent)	1.40%	2.70%	1.60%	2.20%
Mechanical Segment
Disaggregation of Revenue
Revenue	$ 1,810,462	$ 1,438,617	$ 4,851,349	$ 4,075,305
Percentage of revenue from contract with customer (as a percent)	73.90%	79.40%	75.10%	79.00%
Electrical Segment
Disaggregation of Revenue
Revenue	$ 640,507	$ 373,749	$ 1,604,225	$ 1,084,367
Percentage of revenue from contract with customer (as a percent)	26.10%	20.60%	24.90%	21.00%