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Revenue from Contracts with Customers - Schedule of Disaggregation of Revenues (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2025	Mar. 31, 2024
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 3,867,372	$ 3,432,276
UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		3,762,071	3,327,589
United States Electrical Construction And Facilities Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		1,087,844	764,711
United States Electrical Construction And Facilities Services [Member] | UNITED STATES | Operating Segments [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		1,089,950	765,202
United States Electrical Construction And Facilities Services [Member] | UNITED STATES | Operating Segments [Member] | Network and Communications Market Sector [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 516,337	$ 309,540
Percent of total segment revenues		47.00%	40.00%
United States Electrical Construction And Facilities Services [Member] | UNITED STATES | Operating Segments [Member] | Commercial Market Sector [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 98,558	$ 93,448
Percent of total segment revenues		9.00%	12.00%
United States Electrical Construction And Facilities Services [Member] | UNITED STATES | Operating Segments [Member] | Manufacturing and Industrial Market Sector [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 98,475	$ 100,551
Percent of total segment revenues		9.00%	13.00%
United States Electrical Construction And Facilities Services [Member] | UNITED STATES | Operating Segments [Member] | Healthcare Market Sector [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 107,736	$ 53,380
Percent of total segment revenues		10.00%	7.00%
United States Electrical Construction And Facilities Services [Member] | UNITED STATES | Operating Segments [Member] | High-Tech Manufacturing Market Sector [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 45,010	$ 35,243
Percent of total segment revenues		4.00%	4.00%
United States Electrical Construction And Facilities Services [Member] | UNITED STATES | Operating Segments [Member] | Institutional Market Sector [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 51,709	$ 38,070
Percent of total segment revenues		5.00%	5.00%
United States Electrical Construction And Facilities Services [Member] | UNITED STATES | Operating Segments [Member] | Transportation Market Sector [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 62,028	$ 43,624
Percent of total segment revenues		6.00%	6.00%
United States Electrical Construction And Facilities Services [Member] | UNITED STATES | Operating Segments [Member] | Water and Wastewater Market Sector [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 12,759	$ 4,207
Percent of total segment revenues		1.00%	1.00%
United States Electrical Construction And Facilities Services [Member] | UNITED STATES | Operating Segments [Member] | Hospitality and Entertainment Market Sector [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 23,224	$ 21,955
Percent of total segment revenues		2.00%	3.00%
United States Electrical Construction And Facilities Services [Member] | UNITED STATES | Operating Segments [Member] | Short-Duration Projects [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities	[1]	$ 54,977	$ 51,059
Percent of total segment revenues		5.00%	7.00%
United States Electrical Construction And Facilities Services [Member] | UNITED STATES | Operating Segments [Member] | Service Work [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 19,137	$ 14,125
Percent of total segment revenues		2.00%	2.00%
United States Electrical Construction And Facilities Services [Member] | UNITED STATES | Intersegment Eliminations [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ (2,106)	$ (491)
United States Mechanical Construction And Facilities Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		1,572,602	1,427,665
United States Mechanical Construction And Facilities Services [Member] | UNITED STATES | Operating Segments [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		1,573,621	1,428,981
United States Mechanical Construction And Facilities Services [Member] | UNITED STATES | Operating Segments [Member] | Network and Communications Market Sector [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 330,361	$ 131,081
Percent of total segment revenues		21.00%	9.00%
United States Mechanical Construction And Facilities Services [Member] | UNITED STATES | Operating Segments [Member] | Commercial Market Sector [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 179,903	$ 259,770
Percent of total segment revenues		12.00%	18.00%
United States Mechanical Construction And Facilities Services [Member] | UNITED STATES | Operating Segments [Member] | Manufacturing and Industrial Market Sector [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 177,901	$ 187,726
Percent of total segment revenues		11.00%	13.00%
United States Mechanical Construction And Facilities Services [Member] | UNITED STATES | Operating Segments [Member] | Healthcare Market Sector [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 143,563	$ 117,253
Percent of total segment revenues		9.00%	8.00%
United States Mechanical Construction And Facilities Services [Member] | UNITED STATES | Operating Segments [Member] | High-Tech Manufacturing Market Sector [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 282,371	$ 310,930
Percent of total segment revenues		18.00%	22.00%
United States Mechanical Construction And Facilities Services [Member] | UNITED STATES | Operating Segments [Member] | Institutional Market Sector [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 84,856	$ 98,354
Percent of total segment revenues		5.00%	7.00%
United States Mechanical Construction And Facilities Services [Member] | UNITED STATES | Operating Segments [Member] | Transportation Market Sector [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 14,116	$ 14,012
Percent of total segment revenues		1.00%	1.00%
United States Mechanical Construction And Facilities Services [Member] | UNITED STATES | Operating Segments [Member] | Water and Wastewater Market Sector [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 76,448	$ 63,434
Percent of total segment revenues		5.00%	5.00%
United States Mechanical Construction And Facilities Services [Member] | UNITED STATES | Operating Segments [Member] | Hospitality and Entertainment Market Sector [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 29,205	$ 12,855
Percent of total segment revenues		2.00%	1.00%
United States Mechanical Construction And Facilities Services [Member] | UNITED STATES | Operating Segments [Member] | Short-Duration Projects [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities	[1]	$ 108,526	$ 105,216
Percent of total segment revenues		7.00%	7.00%
United States Mechanical Construction And Facilities Services [Member] | UNITED STATES | Operating Segments [Member] | Service Work [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 146,371	$ 128,350
Percent of total segment revenues		9.00%	9.00%
United States Mechanical Construction And Facilities Services [Member] | UNITED STATES | Intersegment Eliminations [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ (1,019)	$ (1,316)
United States Building Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		742,623	781,160
United States Building Services [Member] | UNITED STATES | Mechanical Services [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 558,486	$ 514,148
Percent of total segment revenues		75.00%	66.00%
United States Building Services [Member] | UNITED STATES | Commercial Site-Based Services [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 143,309	$ 218,629
Percent of total segment revenues		19.00%	28.00%
United States Building Services [Member] | UNITED STATES | Government Site-Based Services [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 40,828	$ 48,383
Percent of total segment revenues		6.00%	6.00%
United States Industrial Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 359,002	$ 354,053
United States Industrial Services [Member] | UNITED STATES | Field Services [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 317,667	$ 309,801
Percent of total segment revenues		88.00%	88.00%
United States Industrial Services [Member] | UNITED STATES | Shop Services [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 41,335	$ 44,252
Percent of total segment revenues		12.00%	12.00%
United Kingdom Building Services [Member] [Member] | UNITED KINGDOM
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 105,301	$ 104,687
United Kingdom Building Services [Member] [Member] | UNITED KINGDOM | Service Work [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 48,031	$ 49,844
Percent of total segment revenues		46.00%	48.00%
United Kingdom Building Services [Member] [Member] | UNITED KINGDOM | Project Work [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 57,270	$ 54,843
Percent of total segment revenues		54.00%	52.00%
[1] Represents those projects which generally are completed within three months or less.

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