Revenue from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Disaggregation of Revenue
Revenue	$ 1,810,290	$ 1,296,430	$ 3,347,306	$ 2,471,070
Percentage of revenue from contract with customer (as a percent)	100.00%	100.00%	100.00%	100.00%
New Construction
Disaggregation of Revenue
Revenue	$ 1,082,272	$ 681,912	$ 1,981,248	$ 1,309,864
Percentage of revenue from contract with customer (as a percent)	59.80%	52.60%	59.20%	53.00%
Existing Building Construction
Disaggregation of Revenue
Revenue	$ 446,574	$ 358,807	$ 836,943	$ 668,290
Percentage of revenue from contract with customer (as a percent)	24.70%	27.70%	25.00%	27.10%
Service Projects
Disaggregation of Revenue
Revenue	$ 126,280	$ 114,746	$ 230,394	$ 217,851
Percentage of revenue from contract with customer (as a percent)	6.90%	8.80%	6.90%	8.80%
Service Calls, Maintenance and Monitoring
Disaggregation of Revenue
Revenue	$ 155,164	$ 140,965	$ 298,721	$ 275,065
Percentage of revenue from contract with customer (as a percent)	8.60%	10.90%	8.90%	11.10%
Technology
Disaggregation of Revenue
Revenue	$ 561,313	$ 265,231	$ 1,026,127	$ 491,480
Percentage of revenue from contract with customer (as a percent)	31.00%	20.50%	30.70%	19.90%
Manufacturing
Disaggregation of Revenue
Revenue	$ 526,215	$ 435,819	$ 987,615	$ 802,175
Percentage of revenue from contract with customer (as a percent)	29.00%	33.60%	29.50%	32.50%
Education
Disaggregation of Revenue
Revenue	$ 193,433	$ 127,178	$ 327,416	$ 237,431
Percentage of revenue from contract with customer (as a percent)	10.70%	9.80%	9.80%	9.60%
Healthcare
Disaggregation of Revenue
Revenue	$ 140,747	$ 138,384	$ 274,476	$ 298,199
Percentage of revenue from contract with customer (as a percent)	7.80%	10.70%	8.20%	12.10%
Office Buildings
Disaggregation of Revenue
Revenue	$ 115,012	$ 95,971	$ 216,904	$ 194,166
Percentage of revenue from contract with customer (as a percent)	6.40%	7.40%	6.50%	7.90%
Retail, Restaurants and Entertainment
Disaggregation of Revenue
Revenue	$ 114,501	$ 80,783	$ 195,086	$ 156,977
Percentage of revenue from contract with customer (as a percent)	6.30%	6.20%	5.80%	6.30%
Government
Disaggregation of Revenue
Revenue	$ 91,073	$ 77,597	$ 178,874	$ 142,012
Percentage of revenue from contract with customer (as a percent)	5.00%	6.00%	5.30%	5.70%
Multi-Family and Residential
Disaggregation of Revenue
Revenue	$ 36,181	$ 46,295	$ 77,032	$ 91,302
Percentage of revenue from contract with customer (as a percent)	2.00%	3.60%	2.30%	3.70%
Other
Disaggregation of Revenue
Revenue	$ 31,815	$ 29,172	$ 63,776	$ 57,328
Percentage of revenue from contract with customer (as a percent)	1.80%	2.20%	1.90%	2.30%
Mechanical Segment
Disaggregation of Revenue
Revenue	$ 1,451,679	$ 975,923	$ 2,636,688	$ 1,894,538
Percentage of revenue from contract with customer (as a percent)	80.20%	75.30%	78.80%	76.70%
Electrical Segment
Disaggregation of Revenue
Revenue	$ 358,611	$ 320,507	$ 710,618	$ 576,532
Percentage of revenue from contract with customer (as a percent)	19.80%	24.70%	21.20%	23.30%