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Revenue from Contracts with Customers - Schedule of Disaggregation of Revenues (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 3,696,924	$ 3,207,598	$ 10,796,097	$ 9,143,652
UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		3,590,574	3,096,872	10,478,493	8,816,009
United States Electrical Construction And Facilities Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		845,030	697,406	2,409,735	2,020,319
United States Electrical Construction And Facilities Services [Member] | UNITED STATES | Operating Segments [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		846,064	697,766	2,412,853	2,022,002
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		$ 367,555	$ 236,454	$ 1,002,116	$ 665,493
Percent of total segment revenues		43.00%	34.00%	42.00%	33.00%
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		$ 70,366	$ 104,270	$ 233,365	$ 295,188
Percent of total segment revenues		8.00%	15.00%	10.00%	15.00%
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		$ 109,528	$ 97,788	$ 313,454	$ 278,912
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		$ 62,102	$ 62,126	$ 177,059	$ 182,442
Percent of total segment revenues		7.00%	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		$ 48,960	$ 33,482	$ 137,306	$ 102,075
Percent of total segment revenues		6.00%	5.00%	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		$ 51,504	$ 37,916	$ 128,075	$ 112,577
Percent of total segment revenues		6.00%	6.00%	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		$ 47,720	$ 43,287	$ 147,701	$ 118,436
Percent of total segment revenues		6.00%	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		$ 8,038	$ 6,327	$ 23,337	$ 18,388
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		$ 16,835	$ 16,708	$ 55,143	$ 56,510
Percent of total segment revenues		2.00%	2.00%	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]	$ 48,225	$ 43,481	$ 150,508	$ 141,901
Percent of total segment revenues		6.00%	6.00%	6.00%	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		$ 15,231	$ 15,927	$ 44,789	$ 50,080
Percent of total segment revenues		2.00%	2.00%	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		$ (1,034)	$ (360)	$ (3,118)	$ (1,683)
United States Mechanical Construction And Facilities Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		1,662,211	1,329,600	4,745,057	3,602,271
United States Mechanical Construction And Facilities Services [Member] | UNITED STATES | Operating Segments [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		1,663,818	1,332,747	4,749,730	3,608,595
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		$ 221,700	$ 102,630	$ 527,404	$ 289,085
Percent of total segment revenues		13.00%	8.00%	11.00%	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		$ 243,629	$ 283,659	$ 775,767	$ 828,809
Percent of total segment revenues		15.00%	21.00%	16.00%	23.00%
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		$ 176,127	$ 178,123	$ 568,502	$ 485,809
Percent of total segment revenues		11.00%	13.00%	12.00%	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		$ 152,851	$ 123,025	$ 426,275	$ 353,595
Percent of total segment revenues		9.00%	9.00%	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		$ 388,084	$ 255,229	$ 1,075,890	$ 549,678
Percent of total segment revenues		23.00%	19.00%	23.00%	15.00%
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		$ 136,218	$ 89,215	$ 360,602	$ 224,889
Percent of total segment revenues		8.00%	7.00%	8.00%	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		$ 13,834	$ 10,168	$ 43,496	$ 31,615
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		$ 74,478	$ 65,219	$ 224,921	$ 201,167
Percent of total segment revenues		5.00%	5.00%	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		$ 20,272	$ 14,716	$ 49,902	$ 38,324
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]	$ 71,085	$ 81,851	$ 253,916	$ 237,246
Percent of total segment revenues		4.00%	6.00%	5.00%	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		$ 165,540	$ 128,912	$ 443,055	$ 368,378
Percent of total segment revenues		10.00%	10.00%	9.00%	10.00%
United States Mechanical Construction And Facilities Services [Member] | UNITED STATES | Intersegment Eliminations [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ (1,607)	$ (3,147)	$ (4,673)	$ (6,324)
United States Building Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		796,923	817,718	2,359,191	2,318,105
United States Building Services [Member] | UNITED STATES | Mechanical Services [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 599,371	$ 542,371	$ 1,695,254	$ 1,519,410
Percent of total segment revenues		75.00%	66.00%	72.00%	65.00%
United States Building Services [Member] | UNITED STATES | Commercial Site-Based Services [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 151,852	$ 222,499	$ 522,353	$ 639,193
Percent of total segment revenues		19.00%	27.00%	22.00%	28.00%
United States Building Services [Member] | UNITED STATES | Government Site-Based Services [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 45,700	$ 52,848	$ 141,584	$ 159,502
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		$ 286,410	$ 252,148	$ 964,510	$ 875,314
United States Industrial Services [Member] | UNITED STATES | Field Services [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 251,552	$ 214,341	$ 837,224	$ 751,062
Percent of total segment revenues		88.00%	85.00%	87.00%	86.00%
United States Industrial Services [Member] | UNITED STATES | Shop Services [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 34,858	$ 37,807	$ 127,286	$ 124,252
Percent of total segment revenues		12.00%	15.00%	13.00%	14.00%
United Kingdom Building Services [Member] [Member] | UNITED KINGDOM
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 106,350	$ 110,726	$ 317,604	$ 327,643
United Kingdom Building Services [Member] [Member] | UNITED KINGDOM | Service Work [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 49,530	$ 54,286	$ 150,534	$ 157,631
Percent of total segment revenues		47.00%	49.00%	47.00%	48.00%
United Kingdom Building Services [Member] [Member] | UNITED KINGDOM | Project Work [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 56,820	$ 56,440	$ 167,070	$ 170,012
Percent of total segment revenues		53.00%	51.00%	53.00%	52.00%
[1] Represents those projects which generally are completed within three months or less.

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