Revenue from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Disaggregation of Revenue
Revenue	$ 3,265,656	$ 2,173,319	$ 6,130,988	$ 4,004,605
Percentage of revenue from contract with customer (as a percent)	100.00%	100.00%	100.00%	100.00%
New Construction
Disaggregation of Revenue
Revenue	$ 2,454,064	$ 1,256,866	$ 4,587,558	$ 2,321,950
Percentage of revenue from contract with customer (as a percent)	75.10%	57.90%	74.80%	58.00%
Existing Building Construction
Disaggregation of Revenue
Revenue	$ 483,469	$ 607,236	$ 920,070	$ 1,099,839
Percentage of revenue from contract with customer (as a percent)	14.80%	27.90%	15.00%	27.50%
Service Projects
Disaggregation of Revenue
Revenue	$ 144,742	$ 146,271	$ 282,830	$ 265,485
Percentage of revenue from contract with customer (as a percent)	4.40%	6.70%	4.60%	6.60%
Service Calls, Maintenance and Monitoring
Disaggregation of Revenue
Revenue	$ 183,381	$ 162,946	$ 340,530	$ 317,331
Percentage of revenue from contract with customer (as a percent)	5.70%	7.50%	5.60%	7.90%
Technology
Disaggregation of Revenue
Revenue	$ 1,917,354	$ 934,199	$ 3,533,869	$ 1,611,752
Percentage of revenue from contract with customer (as a percent)	58.70%	43.00%	57.60%	40.20%
Manufacturing
Disaggregation of Revenue
Revenue	$ 535,357	$ 473,040	$ 1,071,799	$ 925,826
Percentage of revenue from contract with customer (as a percent)	16.40%	21.80%	17.50%	23.10%
Healthcare
Disaggregation of Revenue
Revenue	$ 230,783	$ 200,341	$ 451,317	$ 382,883
Percentage of revenue from contract with customer (as a percent)	7.10%	9.20%	7.40%	9.60%
Education
Disaggregation of Revenue
Revenue	$ 168,252	$ 194,845	$ 301,669	$ 356,087
Percentage of revenue from contract with customer (as a percent)	5.10%	8.90%	4.90%	8.90%
Government
Disaggregation of Revenue
Revenue	$ 145,507	$ 107,753	$ 275,820	$ 204,034
Percentage of revenue from contract with customer (as a percent)	4.40%	5.00%	4.50%	5.10%
Office Buildings
Disaggregation of Revenue
Revenue	$ 92,468	$ 110,461	$ 172,808	$ 232,987
Percentage of revenue from contract with customer (as a percent)	2.80%	5.10%	2.80%	5.90%
Retail, Restaurants and Entertainment
Disaggregation of Revenue
Revenue	$ 89,893	$ 85,107	$ 171,179	$ 162,116
Percentage of revenue from contract with customer (as a percent)	2.80%	3.90%	2.80%	4.00%
Multi-Family and Residential
Disaggregation of Revenue
Revenue	$ 44,678	$ 33,214	$ 79,713	$ 61,567
Percentage of revenue from contract with customer (as a percent)	1.40%	1.50%	1.30%	1.50%
Other
Disaggregation of Revenue
Revenue	$ 41,364	$ 34,359	$ 72,814	$ 67,353
Percentage of revenue from contract with customer (as a percent)	1.30%	1.60%	1.20%	1.70%
Mechanical Segment
Disaggregation of Revenue
Revenue	$ 2,296,667	$ 1,638,672	$ 4,357,289	$ 3,040,887
Percentage of revenue from contract with customer (as a percent)	70.30%	75.40%	71.10%	75.90%
Electrical Segment
Disaggregation of Revenue
Revenue	$ 968,989	$ 534,647	$ 1,773,699	$ 963,718
Percentage of revenue from contract with customer (as a percent)	29.70%	24.60%	28.90%	24.10%