Revenue from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disaggregation of Revenue
Revenue	$ 5,206,760	$ 4,140,364	$ 3,073,636
Percentage of revenue from contract with customer (as a percent)	100.00%	100.00%	100.00%
Manufacturing
Disaggregation of Revenue
Revenue	$ 1,751,684	$ 1,426,962	$ 970,986
Percentage of revenue from contract with customer (as a percent)	33.60%	34.50%	31.60%
Technology
Disaggregation of Revenue
Revenue	$ 1,114,382	$ 546,290	$ 385,702
Percentage of revenue from contract with customer (as a percent)	21.40%	13.20%	12.50%
Healthcare
Disaggregation of Revenue
Revenue	$ 554,906	$ 584,023	$ 417,901
Percentage of revenue from contract with customer (as a percent)	10.60%	14.10%	13.60%
Education
Disaggregation of Revenue
Revenue	$ 493,982	$ 445,638	$ 390,251
Percentage of revenue from contract with customer (as a percent)	9.50%	10.80%	12.70%
Office Buildings
Disaggregation of Revenue
Revenue	$ 400,754	$ 349,235	$ 308,799
Percentage of revenue from contract with customer (as a percent)	7.70%	8.40%	10.10%
Retail, Restaurants and Entertainment
Disaggregation of Revenue
Revenue	$ 310,381	$ 311,697	$ 213,386
Percentage of revenue from contract with customer (as a percent)	6.00%	7.50%	6.90%
Government
Disaggregation of Revenue
Revenue	$ 301,837	$ 255,314	$ 174,813
Percentage of revenue from contract with customer (as a percent)	5.80%	6.20%	5.70%
Multi-Family and Residential
Disaggregation of Revenue
Revenue	$ 181,780	$ 126,339	$ 112,779
Percentage of revenue from contract with customer (as a percent)	3.50%	3.00%	3.70%
Other
Disaggregation of Revenue
Revenue	$ 97,054	$ 94,866	$ 99,019
Percentage of revenue from contract with customer (as a percent)	1.90%	2.30%	3.20%
New Construction
Disaggregation of Revenue
Revenue	$ 2,853,239	$ 2,011,992	$ 1,421,784
Percentage of revenue from contract with customer (as a percent)	54.80%	48.60%	46.30%
Existing Building Construction
Disaggregation of Revenue
Revenue	$ 1,337,023	$ 1,210,512	$ 963,461
Percentage of revenue from contract with customer (as a percent)	25.60%	29.20%	31.30%
Service Projects
Disaggregation of Revenue
Revenue	$ 446,151	$ 382,155	$ 278,582
Percentage of revenue from contract with customer (as a percent)	8.60%	9.20%	9.10%
Service Calls, Maintenance and Monitoring
Disaggregation of Revenue
Revenue	$ 570,347	$ 535,705	$ 409,809
Percentage of revenue from contract with customer (as a percent)	11.00%	13.00%	13.30%
Mechanical Segment
Disaggregation of Revenue
Revenue	$ 3,946,022	$ 3,178,475	$ 2,542,623
Percentage of revenue from contract with customer (as a percent)	75.80%	76.80%	82.70%
Electrical Segment
Disaggregation of Revenue
Revenue	$ 1,260,738	$ 961,889	$ 531,013
Percentage of revenue from contract with customer (as a percent)	24.20%	23.20%	17.30%