Revenue from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Disaggregation of Revenue
Revenue	$ 1,831,286	$ 1,537,016
Percentage of revenue from contract with customer (as a percent)	100.00%	100.00%
New Construction
Disaggregation of Revenue
Revenue	$ 1,065,084	$ 898,976
Percentage of revenue from contract with customer (as a percent)	58.20%	58.50%
Existing Building Construction
Disaggregation of Revenue
Revenue	$ 492,603	$ 390,369
Percentage of revenue from contract with customer (as a percent)	26.90%	25.40%
Service Projects
Disaggregation of Revenue
Revenue	$ 119,214	$ 104,114
Percentage of revenue from contract with customer (as a percent)	6.50%	6.80%
Service Calls, Maintenance and Monitoring
Disaggregation of Revenue
Revenue	$ 154,385	$ 143,557
Percentage of revenue from contract with customer (as a percent)	8.40%	9.30%
Technology
Disaggregation of Revenue
Revenue	$ 677,553	$ 464,814
Percentage of revenue from contract with customer (as a percent)	37.00%	30.20%
Manufacturing
Disaggregation of Revenue
Revenue	$ 452,786	$ 461,400
Percentage of revenue from contract with customer (as a percent)	24.70%	30.00%
Education
Disaggregation of Revenue
Revenue	$ 161,242	$ 133,983
Percentage of revenue from contract with customer (as a percent)	8.80%	8.70%
Healthcare
Disaggregation of Revenue
Revenue	$ 182,542	$ 133,729
Percentage of revenue from contract with customer (as a percent)	10.00%	8.70%
Office Buildings
Disaggregation of Revenue
Revenue	$ 122,526	$ 101,892
Percentage of revenue from contract with customer (as a percent)	6.70%	6.60%
Retail, Restaurants and Entertainment
Disaggregation of Revenue
Revenue	$ 77,009	$ 80,585
Percentage of revenue from contract with customer (as a percent)	4.20%	5.20%
Government
Disaggregation of Revenue
Revenue	$ 96,281	$ 87,801
Percentage of revenue from contract with customer (as a percent)	5.30%	5.70%
Multi-Family and Residential
Disaggregation of Revenue
Revenue	$ 28,353	$ 40,851
Percentage of revenue from contract with customer (as a percent)	1.50%	2.70%
Other
Disaggregation of Revenue
Revenue	$ 32,994	$ 31,961
Percentage of revenue from contract with customer (as a percent)	1.80%	2.20%
Mechanical Segment
Disaggregation of Revenue
Revenue	$ 1,402,215	$ 1,185,009
Percentage of revenue from contract with customer (as a percent)	76.60%	77.10%
Electrical Segment
Disaggregation of Revenue
Revenue	$ 429,071	$ 352,007
Percentage of revenue from contract with customer (as a percent)	23.40%	22.90%