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Revenue from Contracts with Customers - Schedule of Disaggregation of Revenues (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 [Line Items]
Revenues from unrelated entities		$ 3,666,897	$ 3,045,622	$ 7,099,173	$ 5,936,054
UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		3,560,330	2,939,575	6,887,919	5,719,137
United States Electrical Construction And Facilities Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		799,994	678,167	1,564,705	1,322,913
United States Electrical Construction And Facilities Services [Member] | UNITED STATES | Operating Segments [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		801,587	678,709	1,566,789	1,324,236
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		$ 325,021	$ 215,288	$ 634,561	$ 429,039
Percent of total segment revenues		40.00%	32.00%	41.00%	32.00%
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		$ 69,551	$ 93,820	$ 162,999	$ 190,918
Percent of total segment revenues		9.00%	14.00%	10.00%	14.00%
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		$ 103,375	$ 95,883	$ 203,926	$ 181,124
Percent of total segment revenues		13.00%	14.00%	13.00%	14.00%
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		$ 61,577	$ 64,813	$ 114,957	$ 120,316
Percent of total segment revenues		8.00%	9.00%	7.00%	9.00%
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		$ 53,103	$ 38,039	$ 88,346	$ 68,593
Percent of total segment revenues		7.00%	6.00%	6.00%	5.00%
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		$ 38,501	$ 37,250	$ 76,571	$ 74,661
Percent of total segment revenues		5.00%	5.00%	5.00%	6.00%
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		$ 56,357	$ 41,247	$ 99,981	$ 75,149
Percent of total segment revenues		7.00%	6.00%	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		$ 11,092	$ 4,603	$ 15,299	$ 12,061
Percent of total segment revenues		1.00%	1.00%	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		$ 16,353	$ 19,750	$ 38,308	$ 39,802
Percent of total segment revenues		2.00%	3.00%	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]	$ 51,224	$ 50,740	$ 102,283	$ 98,420
Percent of total segment revenues		6.00%	7.00%	7.00%	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		$ 15,433	$ 17,276	$ 29,558	$ 34,153
Percent of total segment revenues		2.00%	3.00%	2.00%	3.00%
United States Electrical Construction And Facilities Services [Member] | UNITED STATES | Intersegment Eliminations [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ (1,593)	$ (542)	$ (2,084)	$ (1,323)
United States Mechanical Construction And Facilities Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		1,655,181	1,194,113	3,082,846	2,272,671
United States Mechanical Construction And Facilities Services [Member] | UNITED STATES | Operating Segments [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		1,656,931	1,195,812	3,085,912	2,275,848
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		$ 174,623	$ 87,034	$ 305,704	$ 186,455
Percent of total segment revenues		11.00%	7.00%	10.00%	8.00%
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		$ 272,368	$ 289,304	$ 532,138	$ 545,150
Percent of total segment revenues		16.00%	24.00%	17.00%	24.00%
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		$ 204,649	$ 166,051	$ 392,375	$ 307,686
Percent of total segment revenues		12.00%	14.00%	13.00%	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		$ 156,171	$ 117,842	$ 273,424	$ 230,570
Percent of total segment revenues		9.00%	10.00%	9.00%	10.00%
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		$ 376,876	$ 177,653	$ 687,806	$ 294,449
Percent of total segment revenues		23.00%	15.00%	22.00%	13.00%
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		$ 126,030	$ 71,626	$ 224,384	$ 135,674
Percent of total segment revenues		8.00%	6.00%	7.00%	6.00%
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		$ 15,650	$ 9,229	$ 29,662	$ 21,447
Percent of total segment revenues		1.00%	1.00%	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		$ 87,009	$ 67,286	$ 150,443	$ 135,948
Percent of total segment revenues		5.00%	6.00%	5.00%	6.00%
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		$ 16,775	$ 13,531	$ 29,630	$ 23,608
Percent of total segment revenues		1.00%	1.00%	1.00%	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]	$ 77,615	$ 73,978	$ 182,831	$ 155,395
Percent of total segment revenues		5.00%	6.00%	6.00%	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		$ 149,165	$ 122,278	$ 277,515	$ 239,466
Percent of total segment revenues		9.00%	10.00%	9.00%	11.00%
United States Mechanical Construction And Facilities Services [Member] | UNITED STATES | Intersegment Eliminations [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ (1,750)	$ (1,699)	$ (3,066)	$ (3,177)
United States Building Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		781,108	775,012	1,562,268	1,500,387
United States Building Services [Member] | UNITED STATES | Mechanical Services [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 581,735	$ 514,505	$ 1,095,883	$ 977,039
Percent of total segment revenues		75.00%	66.00%	70.00%	65.00%
United States Building Services [Member] | UNITED STATES | Commercial Site-Based Services [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 151,872	$ 207,323	$ 370,501	$ 416,694
Percent of total segment revenues		19.00%	27.00%	24.00%	28.00%
United States Building Services [Member] | UNITED STATES | Government Site-Based Services [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 47,501	$ 53,184	$ 95,884	$ 106,654
Percent of total segment revenues		6.00%	7.00%	6.00%	7.00%
United States Industrial Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 324,047	$ 292,283	$ 678,100	$ 623,166
United States Industrial Services [Member] | UNITED STATES | Field Services [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 275,871	$ 250,877	$ 585,672	$ 536,721
Percent of total segment revenues		85.00%	86.00%	86.00%	86.00%
United States Industrial Services [Member] | UNITED STATES | Shop Services [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 48,176	$ 41,406	$ 92,428	$ 86,445
Percent of total segment revenues		15.00%	14.00%	14.00%	14.00%
United Kingdom Building Services [Member] [Member] | UNITED KINGDOM
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 106,567	$ 106,047	$ 211,254	$ 216,917
United Kingdom Building Services [Member] [Member] | UNITED KINGDOM | Service Work [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 51,160	$ 51,682	$ 101,004	$ 103,345
Percent of total segment revenues		48.00%	49.00%	48.00%	48.00%
United Kingdom Building Services [Member] [Member] | UNITED KINGDOM | Project Work [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 55,407	$ 54,365	$ 110,250	$ 113,572
Percent of total segment revenues		52.00%	51.00%	52.00%	52.00%
[1] Represents those projects which generally are completed within three months or less.

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