Revenue from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Disaggregation of Revenue
Revenue	$ 2,173,319	$ 1,810,290	$ 4,004,605	$ 3,347,306
Percentage of revenue from contract with customer (as a percent)	100.00%	100.00%	100.00%	100.00%
New Construction
Disaggregation of Revenue
Revenue	$ 1,256,866	$ 1,082,272	$ 2,321,950	$ 1,981,248
Percentage of revenue from contract with customer (as a percent)	57.90%	59.80%	58.00%	59.20%
Existing Building Construction
Disaggregation of Revenue
Revenue	$ 607,236	$ 446,574	$ 1,099,839	$ 836,943
Percentage of revenue from contract with customer (as a percent)	27.90%	24.70%	27.50%	25.00%
Service Projects
Disaggregation of Revenue
Revenue	$ 146,271	$ 126,280	$ 265,485	$ 230,394
Percentage of revenue from contract with customer (as a percent)	6.70%	6.90%	6.60%	6.90%
Service Calls, Maintenance and Monitoring
Disaggregation of Revenue
Revenue	$ 162,946	$ 155,164	$ 317,331	$ 298,721
Percentage of revenue from contract with customer (as a percent)	7.50%	8.60%	7.90%	8.90%
Technology
Disaggregation of Revenue
Revenue	$ 934,199	$ 561,313	$ 1,611,752	$ 1,026,127
Percentage of revenue from contract with customer (as a percent)	43.00%	31.00%	40.20%	30.70%
Manufacturing
Disaggregation of Revenue
Revenue	$ 473,040	$ 526,215	$ 925,826	$ 987,615
Percentage of revenue from contract with customer (as a percent)	21.80%	29.00%	23.10%	29.50%
Healthcare
Disaggregation of Revenue
Revenue	$ 200,341	$ 140,747	$ 382,883	$ 274,476
Percentage of revenue from contract with customer (as a percent)	9.20%	7.80%	9.60%	8.20%
Education
Disaggregation of Revenue
Revenue	$ 194,845	$ 193,433	$ 356,087	$ 327,416
Percentage of revenue from contract with customer (as a percent)	8.90%	10.70%	8.90%	9.80%
Office Buildings
Disaggregation of Revenue
Revenue	$ 110,461	$ 115,012	$ 232,987	$ 216,904
Percentage of revenue from contract with customer (as a percent)	5.10%	6.40%	5.90%	6.50%
Government
Disaggregation of Revenue
Revenue	$ 107,753	$ 91,073	$ 204,034	$ 178,874
Percentage of revenue from contract with customer (as a percent)	5.00%	5.00%	5.10%	5.30%
Retail, Restaurants and Entertainment
Disaggregation of Revenue
Revenue	$ 85,107	$ 114,501	$ 162,116	$ 195,086
Percentage of revenue from contract with customer (as a percent)	3.90%	6.30%	4.00%	5.80%
Multi-Family and Residential
Disaggregation of Revenue
Revenue	$ 33,214	$ 36,181	$ 61,567	$ 77,032
Percentage of revenue from contract with customer (as a percent)	1.50%	2.00%	1.50%	2.30%
Other
Disaggregation of Revenue
Revenue	$ 34,359	$ 31,815	$ 67,353	$ 63,776
Percentage of revenue from contract with customer (as a percent)	1.60%	1.80%	1.70%	1.90%
Mechanical Segment
Disaggregation of Revenue
Revenue	$ 1,638,672	$ 1,451,679	$ 3,040,887	$ 2,636,688
Percentage of revenue from contract with customer (as a percent)	75.40%	80.20%	75.90%	78.80%
Electrical Segment
Disaggregation of Revenue
Revenue	$ 534,647	$ 358,611	$ 963,718	$ 710,618
Percentage of revenue from contract with customer (as a percent)	24.60%	19.80%	24.10%	21.20%