Revenue from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Disaggregation of Revenue
Revenue	$ 1,537,016	$ 1,174,640
Percentage of revenue from contract with customer (as a percent)	100.00%	100.00%
New Construction
Disaggregation of Revenue
Revenue	$ 898,976	$ 627,952
Percentage of revenue from contract with customer (as a percent)	58.50%	53.50%
Existing Building Construction
Disaggregation of Revenue
Revenue	$ 390,369	$ 309,483
Percentage of revenue from contract with customer (as a percent)	25.40%	26.30%
Service Projects
Disaggregation of Revenue
Revenue	$ 104,114	$ 103,105
Percentage of revenue from contract with customer (as a percent)	6.80%	8.80%
Service Calls, Maintenance and Monitoring
Disaggregation of Revenue
Revenue	$ 143,557	$ 134,100
Percentage of revenue from contract with customer (as a percent)	9.30%	11.40%
Manufacturing
Disaggregation of Revenue
Revenue	$ 461,400	$ 366,356
Percentage of revenue from contract with customer (as a percent)	30.00%	31.20%
Technology
Disaggregation of Revenue
Revenue	$ 464,814	$ 226,249
Percentage of revenue from contract with customer (as a percent)	30.20%	19.30%
Healthcare
Disaggregation of Revenue
Revenue	$ 133,729	$ 159,815
Percentage of revenue from contract with customer (as a percent)	8.70%	13.50%
Education
Disaggregation of Revenue
Revenue	$ 133,983	$ 110,253
Percentage of revenue from contract with customer (as a percent)	8.70%	9.40%
Office Buildings
Disaggregation of Revenue
Revenue	$ 101,892	$ 98,195
Percentage of revenue from contract with customer (as a percent)	6.60%	8.40%
Retail, Restaurants and Entertainment
Disaggregation of Revenue
Revenue	$ 80,585	$ 76,194
Percentage of revenue from contract with customer (as a percent)	5.20%	6.50%
Government
Disaggregation of Revenue
Revenue	$ 87,801	$ 64,415
Percentage of revenue from contract with customer (as a percent)	5.70%	5.50%
Multi-Family and Residential
Disaggregation of Revenue
Revenue	$ 40,851	$ 45,007
Percentage of revenue from contract with customer (as a percent)	2.70%	3.80%
Other
Disaggregation of Revenue
Revenue	$ 31,961	$ 28,156
Percentage of revenue from contract with customer (as a percent)	2.20%	2.40%
Mechanical Segment
Disaggregation of Revenue
Revenue	$ 1,185,009	$ 918,615
Percentage of revenue from contract with customer (as a percent)	77.10%	78.20%
Electrical Segment
Disaggregation of Revenue
Revenue	$ 352,007	$ 256,025
Percentage of revenue from contract with customer (as a percent)	22.90%	21.80%