Revenue from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Disaggregation of Revenue
Revenue	$ 1,120,012	$ 833,896	$ 3,023,176	$ 2,217,552
Percentage of revenue from contract with customer (as a percent)	100.00%	100.00%	100.00%	100.00%
Industrial
Disaggregation of Revenue
Revenue	$ 542,222	$ 379,605	$ 1,422,897	$ 960,263
Percentage of revenue from contract with customer (as a percent)	48.40%	45.50%	47.10%	43.30%
Education
Disaggregation of Revenue
Revenue	$ 133,422	$ 115,536	$ 342,116	$ 300,374
Percentage of revenue from contract with customer (as a percent)	11.90%	13.90%	11.30%	13.50%
Office Buildings
Disaggregation of Revenue
Revenue	$ 94,931	$ 77,806	$ 255,963	$ 229,816
Percentage of revenue from contract with customer (as a percent)	8.50%	9.30%	8.50%	10.40%
Healthcare
Disaggregation of Revenue
Revenue	$ 147,234	$ 101,446	$ 423,142	$ 292,541
Percentage of revenue from contract with customer (as a percent)	13.20%	12.20%	14.00%	13.20%
Government
Disaggregation of Revenue
Revenue	$ 63,070	$ 40,268	$ 186,747	$ 125,939
Percentage of revenue from contract with customer (as a percent)	5.60%	4.80%	6.20%	5.70%
Retail, Restaurants and Entertainment
Disaggregation of Revenue
Revenue	$ 84,354	$ 62,365	$ 230,370	$ 155,874
Percentage of revenue from contract with customer (as a percent)	7.50%	7.50%	7.60%	7.00%
Multi-Family and Residential
Disaggregation of Revenue
Revenue	$ 34,310	$ 29,741	$ 88,924	$ 82,742
Percentage of revenue from contract with customer (as a percent)	3.10%	3.60%	2.90%	3.70%
Other
Disaggregation of Revenue
Revenue	$ 20,469	$ 27,129	$ 73,017	$ 70,003
Percentage of revenue from contract with customer (as a percent)	1.80%	3.20%	2.40%	3.20%
New Construction
Disaggregation of Revenue
Revenue	$ 524,122	$ 397,446	$ 1,438,453	$ 1,029,397
Percentage of revenue from contract with customer (as a percent)	46.80%	47.60%	47.60%	46.40%
Existing Building Construction
Disaggregation of Revenue
Revenue	$ 346,683	$ 250,893	$ 910,284	$ 682,811
Percentage of revenue from contract with customer (as a percent)	31.00%	30.10%	30.10%	30.80%
Service Projects
Disaggregation of Revenue
Revenue	$ 103,439	$ 75,525	$ 273,663	$ 201,848
Percentage of revenue from contract with customer (as a percent)	9.20%	9.10%	9.00%	9.10%
Service Calls, Maintenance and Monitoring
Disaggregation of Revenue
Revenue	$ 145,768	$ 110,032	$ 400,776	$ 303,496
Percentage of revenue from contract with customer (as a percent)	13.00%	13.20%	13.30%	13.70%
Mechanical Services
Disaggregation of Revenue
Revenue	$ 858,768	$ 690,680	$ 2,318,036	$ 1,868,096
Percentage of revenue from contract with customer (as a percent)	76.70%	82.80%	76.70%	84.20%
Electrical Services
Disaggregation of Revenue
Revenue	$ 261,244	$ 143,216	$ 705,140	$ 349,456
Percentage of revenue from contract with customer (as a percent)	23.30%	17.20%	23.30%	15.80%