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Revenue from Contracts with Customers - Schedule of Disaggregation of Revenues (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Disaggregation of Revenue [Line Items]
Revenues		$ 14,566,116	$ 12,582,873	$ 11,076,120
UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues		14,140,591	12,146,450	10,599,042
United States Electrical Construction And Facilities Services | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues		3,342,927	2,783,723	2,433,114
United States Mechanical Construction And Facilities Services | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues		6,405,657	5,074,803	4,292,208
United States Building Services | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues		3,114,817	3,120,134	2,754,953
United States Industrial Services | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues		1,277,190	1,167,790	1,118,767
United Kingdom Building Services | UNITED KINGDOM
Disaggregation of Revenue [Line Items]
Revenues		425,525	436,423	477,078
Operating Segments [Member] | United States Electrical Construction And Facilities Services | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues		3,349,115	2,786,007	2,437,304
Operating Segments [Member] | United States Mechanical Construction And Facilities Services | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues		6,411,887	5,083,903	4,303,090
Intersegment Eliminations [Member] | United States Electrical Construction And Facilities Services | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues		(6,188)	(2,284)	(4,190)
Intersegment Eliminations [Member] | United States Mechanical Construction And Facilities Services | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues		(6,230)	(9,100)	(10,882)
Network and Communications Market Sector | Operating Segments [Member] | United States Electrical Construction And Facilities Services | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues		$ 1,442,877	$ 934,455	$ 801,052
Percentage of total segment revenues		43.00%	34.00%	33.00%
Network and Communications Market Sector | Operating Segments [Member] | United States Mechanical Construction And Facilities Services | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues		$ 818,991	$ 410,397	$ 295,261
Percentage of total segment revenues		13.00%	8.00%	7.00%
Commercial Market Sector [Member] | Operating Segments [Member] | United States Electrical Construction And Facilities Services | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues		$ 310,730	$ 402,886	$ 414,539
Percentage of total segment revenues		9.00%	14.00%	17.00%
Commercial Market Sector [Member] | Operating Segments [Member] | United States Mechanical Construction And Facilities Services | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues		$ 989,012	$ 1,115,993	$ 1,079,872
Percentage of total segment revenues		15.00%	22.00%	25.00%
Manufacturing and Industrial Market Sector [Member] | Operating Segments [Member] | United States Electrical Construction And Facilities Services | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues		$ 439,450	$ 394,804	$ 301,606
Percentage of total segment revenues		13.00%	14.00%	12.00%
Manufacturing and Industrial Market Sector [Member] | Operating Segments [Member] | United States Mechanical Construction And Facilities Services | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues		$ 736,775	$ 698,993	$ 632,332
Percentage of total segment revenues		12.00%	14.00%	15.00%
Healthcare Market Sector [Member] | Operating Segments [Member] | United States Electrical Construction And Facilities Services | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues		$ 242,458	$ 242,931	$ 178,348
Percentage of total segment revenues		7.00%	9.00%	7.00%
Healthcare Market Sector [Member] | Operating Segments [Member] | United States Mechanical Construction And Facilities Services | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues		$ 580,676	$ 489,485	$ 479,937
Percentage of total segment revenues		9.00%	10.00%	11.00%
High-Tech Manufacturing Market Sector | Operating Segments [Member] | United States Electrical Construction And Facilities Services | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues		$ 190,992	$ 140,471	$ 88,544
Percentage of total segment revenues		6.00%	5.00%	4.00%
High-Tech Manufacturing Market Sector | Operating Segments [Member] | United States Mechanical Construction And Facilities Services | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues		$ 1,453,384	$ 845,251	$ 320,597
Percentage of total segment revenues		23.00%	16.00%	7.00%
Institutional Market Sector [Member] | Operating Segments [Member] | United States Electrical Construction And Facilities Services | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues		$ 174,073	$ 147,375	$ 154,077
Percentage of total segment revenues		5.00%	5.00%	6.00%
Institutional Market Sector [Member] | Operating Segments [Member] | United States Mechanical Construction And Facilities Services | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues		$ 455,940	$ 316,255	$ 331,727
Percentage of total segment revenues		7.00%	6.00%	8.00%
Transportation Market Sector [Member] | Operating Segments [Member] | United States Electrical Construction And Facilities Services | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues		$ 210,835	$ 167,976	$ 166,563
Percentage of total segment revenues		6.00%	6.00%	7.00%
Transportation Market Sector [Member] | Operating Segments [Member] | United States Mechanical Construction And Facilities Services | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues		$ 55,622	$ 42,789	$ 57,026
Percentage of total segment revenues		1.00%	1.00%	1.00%
Water and Wastewater Market Sector [Member] | Operating Segments [Member] | United States Electrical Construction And Facilities Services | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues		$ 27,751	$ 21,234	$ 21,251
Percentage of total segment revenues		1.00%	1.00%	1.00%
Water and Wastewater Market Sector [Member] | Operating Segments [Member] | United States Mechanical Construction And Facilities Services | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues		$ 308,329	$ 286,912	$ 261,501
Percentage of total segment revenues		5.00%	6.00%	6.00%
Hospitality and Entertainment Market Sector [Member] | Operating Segments [Member] | United States Electrical Construction And Facilities Services | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues		$ 66,982	$ 81,815	$ 33,818
Percentage of total segment revenues		2.00%	3.00%	1.00%
Hospitality and Entertainment Market Sector [Member] | Operating Segments [Member] | United States Mechanical Construction And Facilities Services | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues		$ 70,707	$ 52,919	$ 44,615
Percentage of total segment revenues		1.00%	1.00%	1.00%
Short Duration Projects [Member] | Operating Segments [Member] | United States Electrical Construction And Facilities Services | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues	[1]	$ 180,020	$ 186,722	$ 211,797
Percentage of total segment revenues		6.00%	7.00%	9.00%
Short Duration Projects [Member] | Operating Segments [Member] | United States Mechanical Construction And Facilities Services | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues	[1]	$ 335,900	$ 324,056	$ 333,066
Percentage of total segment revenues		5.00%	6.00%	8.00%
Service Work [Member] | Operating Segments [Member] | United States Electrical Construction And Facilities Services | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues		$ 62,947	$ 65,338	$ 65,709
Percentage of total segment revenues		2.00%	2.00%	3.00%
Service Work [Member] | Operating Segments [Member] | United States Mechanical Construction And Facilities Services | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues		$ 606,551	$ 500,853	$ 467,156
Percentage of total segment revenues		9.00%	10.00%	11.00%
Service Work [Member] | Operating Segments [Member] | United Kingdom Building Services | UNITED KINGDOM
Disaggregation of Revenue [Line Items]
Revenues		$ 199,658	$ 210,414	$ 221,123
Percentage of total segment revenues		47.00%	48.00%	46.00%
Mechanical Services [Member] | Operating Segments [Member] | United States Building Services | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues		$ 2,260,607	$ 2,042,244	$ 1,748,455
Percentage of total segment revenues		73.00%	65.00%	64.00%
Commercial Site-Based Services [Member] | Operating Segments [Member] | United States Building Services | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues		$ 669,584	$ 865,232	$ 810,210
Percentage of total segment revenues		21.00%	28.00%	29.00%
Government Site-Based Services [Member] | Operating Segments [Member] | United States Building Services | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues		$ 184,626	$ 212,658	$ 196,288
Percentage of total segment revenues		6.00%	7.00%	7.00%
Field Services [Member] | Operating Segments [Member] | United States Industrial Services | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues		$ 1,113,613	$ 991,466	$ 972,894
Percentage of total segment revenues		87.00%	85.00%	87.00%
Shop Services [Member] | Operating Segments [Member] | United States Industrial Services | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues		$ 163,577	$ 176,324	$ 145,873
Percentage of total segment revenues		13.00%	15.00%	13.00%
Project Work [Member] | Operating Segments [Member] | United Kingdom Building Services | UNITED KINGDOM
Disaggregation of Revenue [Line Items]
Revenues		$ 225,867	$ 226,009	$ 255,955
Percentage of total segment revenues		53.00%	52.00%	54.00%
[1] Represents those projects which generally are completed within three months or less.

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