Revenue from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Disaggregation of Revenue
Revenue	$ 1,296,430	$ 1,017,948	$ 2,471,070	$ 1,903,164
Percentage of revenue from contract with customer (as a percent)	100.00%	100.00%	100.00%	100.00%
Manufacturing
Disaggregation of Revenue
Revenue	$ 435,819	$ 338,413	$ 802,175	$ 653,142
Percentage of revenue from contract with customer (as a percent)	33.60%	33.20%	32.50%	34.30%
Technology
Disaggregation of Revenue
Revenue	$ 265,231	$ 132,078	$ 491,480	$ 227,533
Percentage of revenue from contract with customer (as a percent)	20.50%	13.00%	19.90%	12.00%
Healthcare
Disaggregation of Revenue
Revenue	$ 138,384	$ 141,113	$ 298,199	$ 275,908
Percentage of revenue from contract with customer (as a percent)	10.70%	13.90%	12.10%	14.50%
Education
Disaggregation of Revenue
Revenue	$ 127,178	$ 119,248	$ 237,431	$ 208,694
Percentage of revenue from contract with customer (as a percent)	9.80%	11.70%	9.60%	11.00%
Office Buildings
Disaggregation of Revenue
Revenue	$ 95,971	$ 85,917	$ 194,166	$ 161,032
Percentage of revenue from contract with customer (as a percent)	7.40%	8.40%	7.90%	8.50%
Retail, Restaurants and Entertainment
Disaggregation of Revenue
Revenue	$ 80,783	$ 80,434	$ 156,977	$ 146,016
Percentage of revenue from contract with customer (as a percent)	6.20%	7.90%	6.30%	7.70%
Government
Disaggregation of Revenue
Revenue	$ 77,597	$ 66,212	$ 142,012	$ 123,677
Percentage of revenue from contract with customer (as a percent)	6.00%	6.50%	5.70%	6.50%
Multi-Family and Residential
Disaggregation of Revenue
Revenue	$ 46,295	$ 30,172	$ 91,302	$ 54,614
Percentage of revenue from contract with customer (as a percent)	3.60%	3.00%	3.70%	2.80%
Other
Disaggregation of Revenue
Revenue	$ 29,172	$ 24,361	$ 57,328	$ 52,548
Percentage of revenue from contract with customer (as a percent)	2.20%	2.40%	2.30%	2.70%
New Construction
Disaggregation of Revenue
Revenue	$ 681,912	$ 484,913	$ 1,309,864	$ 914,331
Percentage of revenue from contract with customer (as a percent)	52.60%	47.70%	53.00%	48.10%
Existing Building Construction
Disaggregation of Revenue
Revenue	$ 358,807	$ 304,316	$ 668,290	$ 563,601
Percentage of revenue from contract with customer (as a percent)	27.70%	29.90%	27.10%	29.60%
Service Projects
Disaggregation of Revenue
Revenue	$ 114,746	$ 93,972	$ 217,851	$ 170,224
Percentage of revenue from contract with customer (as a percent)	8.80%	9.20%	8.80%	8.90%
Service Calls, Maintenance and Monitoring
Disaggregation of Revenue
Revenue	$ 140,965	$ 134,747	$ 275,065	$ 255,008
Percentage of revenue from contract with customer (as a percent)	10.90%	13.20%	11.10%	13.40%
Mechanical Services
Disaggregation of Revenue
Revenue	$ 975,923	$ 776,757	$ 1,894,538	$ 1,459,268
Percentage of revenue from contract with customer (as a percent)	75.30%	76.30%	76.70%	76.70%
Electrical Services
Disaggregation of Revenue
Revenue	$ 320,507	$ 241,191	$ 576,532	$ 443,896
Percentage of revenue from contract with customer (as a percent)	24.70%	23.70%	23.30%	23.30%