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Revenue from Contracts with Customers - Schedule of Disaggregation of Revenues (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disaggregation of Revenue [Line Items]
Revenues		$ 12,582,873	$ 11,076,120	$ 9,903,580
UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues		12,146,450	10,599,042	9,393,629
United States Electrical Construction And Facilities Services | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues		2,783,723	2,433,114	2,029,893
United States Mechanical Construction And Facilities Services | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues		5,074,803	4,292,208	3,922,200
United States Building Services | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues		3,120,134	2,754,953	2,455,129
United States Industrial Services | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues		1,167,790	1,118,767	986,407
United Kingdom Building Services | UNITED KINGDOM
Disaggregation of Revenue [Line Items]
Revenues		436,423	477,078	509,951
Operating Segments [Member] | United States Electrical Construction And Facilities Services | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues		2,786,007	2,437,304	2,033,168
Operating Segments [Member] | United States Mechanical Construction And Facilities Services | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues		5,083,903	4,303,090	3,929,035
Intersegment Eliminations [Member] | United States Electrical Construction And Facilities Services | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues		(2,284)	(4,190)	(3,275)
Intersegment Eliminations [Member] | United States Mechanical Construction And Facilities Services | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues		(9,100)	(10,882)	(6,835)
Network and Communications Market Sector | Operating Segments [Member] | United States Electrical Construction And Facilities Services | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues		$ 934,455	$ 801,052	$ 621,139
Percentage of total segment revenues		34.00%	33.00%	30.00%
Network and Communications Market Sector | Operating Segments [Member] | United States Mechanical Construction And Facilities Services | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues		$ 410,397	$ 295,261	$ 279,953
Percentage of total segment revenues		8.00%	7.00%	7.00%
Commercial Market Sector [Member] | Operating Segments [Member] | United States Electrical Construction And Facilities Services | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues		$ 402,886	$ 414,539	$ 398,996
Percentage of total segment revenues		14.00%	17.00%	20.00%
Commercial Market Sector [Member] | Operating Segments [Member] | United States Mechanical Construction And Facilities Services | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues		$ 1,115,993	$ 1,079,872	$ 1,042,751
Percentage of total segment revenues		22.00%	25.00%	27.00%
Manufacturing and Industrial Market Sector [Member] | Operating Segments [Member] | United States Electrical Construction And Facilities Services | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues		$ 394,804	$ 301,606	$ 230,894
Percentage of total segment revenues		14.00%	12.00%	11.00%
Manufacturing and Industrial Market Sector [Member] | Operating Segments [Member] | United States Mechanical Construction And Facilities Services | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues		$ 698,993	$ 632,332	$ 579,176
Percentage of total segment revenues		14.00%	15.00%	15.00%
Healthcare Market Sector [Member] | Operating Segments [Member] | United States Electrical Construction And Facilities Services | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues		$ 242,931	$ 178,348	$ 107,442
Percentage of total segment revenues		9.00%	7.00%	5.00%
Healthcare Market Sector [Member] | Operating Segments [Member] | United States Mechanical Construction And Facilities Services | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues		$ 489,485	$ 479,937	$ 487,111
Percentage of total segment revenues		10.00%	11.00%	12.00%
High-Tech Manufacturing Market Sector | Operating Segments [Member] | United States Electrical Construction And Facilities Services | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues		$ 140,471	$ 88,544	$ 35,196
Percentage of total segment revenues		5.00%	4.00%	2.00%
High-Tech Manufacturing Market Sector | Operating Segments [Member] | United States Mechanical Construction And Facilities Services | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues		$ 845,251	$ 320,597	$ 173,302
Percentage of total segment revenues		16.00%	7.00%	4.00%
Institutional Market Sector [Member] | Operating Segments [Member] | United States Electrical Construction And Facilities Services | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues		$ 147,375	$ 154,077	$ 178,729
Percentage of total segment revenues		5.00%	6.00%	9.00%
Institutional Market Sector [Member] | Operating Segments [Member] | United States Mechanical Construction And Facilities Services | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues		$ 316,255	$ 331,727	$ 263,285
Percentage of total segment revenues		6.00%	8.00%	7.00%
Transportation Market Sector [Member] | Operating Segments [Member] | United States Electrical Construction And Facilities Services | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues		$ 167,976	$ 166,563	$ 196,313
Percentage of total segment revenues		6.00%	7.00%	10.00%
Transportation Market Sector [Member] | Operating Segments [Member] | United States Mechanical Construction And Facilities Services | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues		$ 42,789	$ 57,026	$ 84,503
Percentage of total segment revenues		1.00%	1.00%	2.00%
Water and Wastewater Market Sector [Member] | Operating Segments [Member] | United States Electrical Construction And Facilities Services | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues		$ 21,234	$ 21,251	$ 14,962
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		$ 286,912	$ 261,501	$ 213,314
Percentage of total segment revenues		6.00%	6.00%	5.00%
Hospitality and Entertainment Market Sector [Member] | Operating Segments [Member] | United States Electrical Construction And Facilities Services | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues		$ 81,815	$ 33,818	$ 23,257
Percentage of total segment revenues		3.00%	1.00%	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		$ 52,919	$ 44,615	$ 66,059
Percentage of total segment revenues		1.00%	1.00%	2.00%
Short Duration Projects [Member] | Operating Segments [Member] | United States Electrical Construction And Facilities Services | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues	[1]	$ 186,722	$ 211,797	$ 185,277
Percentage of total segment revenues		7.00%	9.00%	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]	$ 324,056	$ 333,066	$ 292,795
Percentage of total segment revenues		6.00%	8.00%	8.00%
Service Work [Member] | Operating Segments [Member] | United States Electrical Construction And Facilities Services | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues		$ 65,338	$ 65,709	$ 40,963
Percentage of total segment revenues		2.00%	3.00%	2.00%
Service Work [Member] | Operating Segments [Member] | United States Mechanical Construction And Facilities Services | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues		$ 500,853	$ 467,156	$ 446,786
Percentage of total segment revenues		10.00%	11.00%	11.00%
Service Work [Member] | Operating Segments [Member] | United Kingdom Building Services | UNITED KINGDOM
Disaggregation of Revenue [Line Items]
Revenues		$ 210,414	$ 221,123	$ 261,889
Percentage of total segment revenues		48.00%	46.00%	51.00%
Mechanical Services [Member] | Operating Segments [Member] | United States Building Services | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues		$ 2,042,244	$ 1,748,455	$ 1,590,506
Percentage of total segment revenues		65.00%	64.00%	65.00%
Commercial Site-Based Services [Member] | Operating Segments [Member] | United States Building Services | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues		$ 865,232	$ 810,210	$ 680,351
Percentage of total segment revenues		28.00%	29.00%	28.00%
Government Site-Based Services [Member] | Operating Segments [Member] | United States Building Services | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues		$ 212,658	$ 196,288	$ 184,272
Percentage of total segment revenues		7.00%	7.00%	7.00%
Field Services [Member] | Operating Segments [Member] | United States Industrial Services | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues		$ 991,466	$ 972,894	$ 853,143
Percentage of total segment revenues		85.00%	87.00%	86.00%
Shop Services [Member] | Operating Segments [Member] | United States Industrial Services | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues		$ 176,324	$ 145,873	$ 133,264
Percentage of total segment revenues		15.00%	13.00%	14.00%
Project Work [Member] | Operating Segments [Member] | United Kingdom Building Services | UNITED KINGDOM
Disaggregation of Revenue [Line Items]
Revenues		$ 226,009	$ 255,955	$ 248,062
Percentage of total segment revenues		52.00%	54.00%	49.00%
[1] Represents those projects which generally are completed within three months or less.

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