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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, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 4,301,529	$ 3,696,924	$ 12,473,301	$ 10,796,097
UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		4,165,341	3,590,574	12,097,248	10,478,493
United States Electrical Construction And Facilities Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		1,285,269	845,030	3,713,360	2,409,735
United States Electrical Construction And Facilities Services [Member] | UNITED STATES | Operating Segments [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		1,286,250	846,064	3,718,083	2,412,853
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		$ 621,650	$ 367,555	$ 1,807,953	$ 1,002,116
Percent of total segment revenues		48.00%	43.00%	49.00%	42.00%
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		$ 110,377	$ 70,366	$ 325,471	$ 233,365
Percent of total segment revenues		9.00%	8.00%	9.00%	10.00%
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		$ 107,895	$ 109,528	$ 317,528	$ 313,454
Percent of total segment revenues		8.00%	13.00%	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		$ 96,319	$ 62,102	$ 337,735	$ 177,059
Percent of total segment revenues		7.00%	7.00%	9.00%	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		$ 33,232	$ 48,960	$ 114,356	$ 137,306
Percent of total segment revenues		3.00%	6.00%	3.00%	6.00%
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		$ 84,776	$ 51,504	$ 203,857	$ 128,075
Percent of total segment revenues		7.00%	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		$ 70,213	$ 47,720	$ 198,769	$ 147,701
Percent of total segment revenues		5.00%	6.00%	5.00%	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		$ 8,869	$ 8,038	$ 29,155	$ 23,337
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		$ 35,305	$ 16,835	$ 84,930	$ 55,143
Percent of total segment revenues		3.00%	2.00%	2.00%	2.00%
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]	$ 92,400	$ 48,225	$ 232,082	$ 150,508
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] | Service Work [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 25,214	$ 15,231	$ 66,247	$ 44,789
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		$ (981)	$ (1,034)	$ (4,723)	$ (3,118)
United States Mechanical Construction And Facilities Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		1,779,279	1,662,211	5,107,139	4,745,057
United States Mechanical Construction And Facilities Services [Member] | UNITED STATES | Operating Segments [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		1,787,568	1,663,818	5,117,821	4,749,730
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		$ 432,138	$ 221,700	$ 1,152,175	$ 527,404
Percent of total segment revenues		24.00%	13.00%	22.00%	11.00%
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		$ 222,953	$ 243,629	$ 619,863	$ 775,767
Percent of total segment revenues		12.00%	15.00%	12.00%	16.00%
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		$ 236,399	$ 176,127	$ 643,922	$ 568,502
Percent of total segment revenues		13.00%	11.00%	13.00%	12.00%
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		$ 145,882	$ 152,851	$ 439,497	$ 426,275
Percent of total segment revenues		8.00%	9.00%	9.00%	9.00%
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		$ 225,801	$ 388,084	$ 789,606	$ 1,075,890
Percent of total segment revenues		13.00%	23.00%	15.00%	23.00%
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		$ 127,085	$ 136,218	$ 324,652	$ 360,602
Percent of total segment revenues		7.00%	8.00%	6.00%	8.00%
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		$ 15,560	$ 13,834	$ 39,729	$ 43,496
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		$ 83,229	$ 74,478	$ 249,916	$ 224,921
Percent of total segment revenues		5.00%	5.00%	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		$ 31,781	$ 20,272	$ 97,848	$ 49,902
Percent of total segment revenues		2.00%	1.00%	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]	$ 105,104	$ 71,085	$ 299,833	$ 253,916
Percent of total segment revenues		6.00%	4.00%	6.00%	5.00%
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		$ 161,636	$ 165,540	$ 460,780	$ 443,055
Percent of total segment revenues		9.00%	10.00%	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		$ (8,289)	$ (1,607)	$ (10,682)	$ (4,673)
United States Building Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		813,879	796,923	2,349,761	2,359,191
United States Building Services [Member] | UNITED STATES | Mechanical Services [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 634,246	$ 599,371	$ 1,812,248	$ 1,695,254
Percent of total segment revenues		78.00%	75.00%	77.00%	72.00%
United States Building Services [Member] | UNITED STATES | Commercial Site-Based Services [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 141,652	$ 151,852	$ 418,521	$ 522,353
Percent of total segment revenues		17.00%	19.00%	18.00%	22.00%
United States Building Services [Member] | UNITED STATES | Government Site-Based Services [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 37,981	$ 45,700	$ 118,992	$ 141,584
Percent of total segment revenues		5.00%	6.00%	5.00%	6.00%
United States Industrial Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 286,914	$ 286,410	$ 926,988	$ 964,510
United States Industrial Services [Member] | UNITED STATES | Field Services [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 245,033	$ 251,552	$ 804,630	$ 837,224
Percent of total segment revenues		85.00%	88.00%	87.00%	87.00%
United States Industrial Services [Member] | UNITED STATES | Shop Services [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 41,881	$ 34,858	$ 122,358	$ 127,286
Percent of total segment revenues		15.00%	12.00%	13.00%	13.00%
United Kingdom Building Services [Member] | UNITED KINGDOM
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 136,188	$ 106,350	$ 376,053	$ 317,604
United Kingdom Building Services [Member] | UNITED KINGDOM | Service Work [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 71,702	$ 49,530	$ 189,394	$ 150,534
Percent of total segment revenues		53.00%	47.00%	50.00%	47.00%
United Kingdom Building Services [Member] | UNITED KINGDOM | Project Work [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 64,486	$ 56,820	$ 186,659	$ 167,070
Percent of total segment revenues		47.00%	53.00%	50.00%	53.00%
[1] Represents those projects which generally are completed within three months or less.

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