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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, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 4,304,400	$ 3,666,897	$ 8,171,772	$ 7,099,173
UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		4,169,836	3,560,330	7,931,907	6,887,919
United States Electrical Construction And Facilities Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		1,340,247	799,994	2,428,091	1,564,705
United States Electrical Construction And Facilities Services [Member] | UNITED STATES | Operating Segments [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		1,341,883	801,587	2,431,833	1,566,789
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		$ 669,966	$ 325,021	$ 1,186,303	$ 634,561
Percent of total segment revenues		50.00%	40.00%	49.00%	41.00%
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		$ 116,536	$ 69,551	$ 215,094	$ 162,999
Percent of total segment revenues		8.00%	9.00%	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		$ 111,158	$ 103,375	$ 209,633	$ 203,926
Percent of total segment revenues		8.00%	13.00%	8.00%	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		$ 133,680	$ 61,577	$ 241,416	$ 114,957
Percent of total segment revenues		10.00%	8.00%	10.00%	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		$ 36,114	$ 53,103	$ 81,124	$ 88,346
Percent of total segment revenues		3.00%	7.00%	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		$ 67,372	$ 38,501	$ 119,081	$ 76,571
Percent of total segment revenues		5.00%	5.00%	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		$ 66,528	$ 56,357	$ 128,556	$ 99,981
Percent of total segment revenues		5.00%	7.00%	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		$ 7,527	$ 11,092	$ 20,286	$ 15,299
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		$ 26,401	$ 16,353	$ 49,625	$ 38,308
Percent of total segment revenues		2.00%	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]	$ 84,705	$ 51,224	$ 139,682	$ 102,283
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		$ 21,896	$ 15,433	$ 41,033	$ 29,558
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		$ (1,636)	$ (1,593)	$ (3,742)	$ (2,084)
United States Mechanical Construction And Facilities Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		1,755,258	1,655,181	3,327,860	3,082,846
United States Mechanical Construction And Facilities Services [Member] | UNITED STATES | Operating Segments [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		1,756,632	1,656,931	3,330,253	3,085,912
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		$ 389,676	$ 174,623	$ 720,037	$ 305,704
Percent of total segment revenues		22.00%	11.00%	21.00%	10.00%
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		$ 217,007	$ 272,368	$ 396,910	$ 532,138
Percent of total segment revenues		12.00%	16.00%	12.00%	17.00%
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		$ 229,622	$ 204,649	$ 407,523	$ 392,375
Percent of total segment revenues		13.00%	12.00%	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		$ 150,052	$ 156,171	$ 293,615	$ 273,424
Percent of total segment revenues		9.00%	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		$ 281,434	$ 376,876	$ 563,805	$ 687,806
Percent of total segment revenues		16.00%	23.00%	17.00%	22.00%
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		$ 112,711	$ 126,030	$ 197,567	$ 224,384
Percent of total segment revenues		6.00%	8.00%	6.00%	7.00%
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		$ 10,053	$ 15,650	$ 24,169	$ 29,662
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		$ 90,239	$ 87,009	$ 166,687	$ 150,443
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		$ 36,862	$ 16,775	$ 66,067	$ 29,630
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]	$ 86,203	$ 77,615	$ 194,729	$ 182,831
Percent of total segment revenues		5.00%	5.00%	6.00%	6.00%
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		$ 152,773	$ 149,165	$ 299,144	$ 277,515
Percent of total segment revenues		9.00%	9.00%	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		$ (1,374)	$ (1,750)	$ (2,393)	$ (3,066)
United States Building Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		793,259	781,108	1,535,882	1,562,268
United States Building Services [Member] | UNITED STATES | Mechanical Services [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 619,516	$ 581,735	$ 1,178,002	$ 1,095,883
Percent of total segment revenues		78.00%	75.00%	77.00%	70.00%
United States Building Services [Member] | UNITED STATES | Commercial Site-Based Services [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 133,560	$ 151,872	$ 276,869	$ 370,501
Percent of total segment revenues		17.00%	19.00%	18.00%	24.00%
United States Building Services [Member] | UNITED STATES | Government Site-Based Services [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 40,183	$ 47,501	$ 81,011	$ 95,884
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		$ 281,072	$ 324,047	$ 640,074	$ 678,100
United States Industrial Services [Member] | UNITED STATES | Field Services [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 241,930	$ 275,871	$ 559,597	$ 585,672
Percent of total segment revenues		86.00%	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		$ 39,142	$ 48,176	$ 80,477	$ 92,428
Percent of total segment revenues		14.00%	15.00%	13.00%	14.00%
United Kingdom Building Services [Member] [Member] | UNITED KINGDOM
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 134,564	$ 106,567	$ 239,865	$ 211,254
United Kingdom Building Services [Member] [Member] | UNITED KINGDOM | Service Work [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 69,661	$ 51,160	$ 117,692	$ 101,004
Percent of total segment revenues		52.00%	48.00%	49.00%	48.00%
United Kingdom Building Services [Member] [Member] | UNITED KINGDOM | Project Work [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 64,903	$ 55,407	$ 122,173	$ 110,250
Percent of total segment revenues		48.00%	52.00%	51.00%	52.00%
[1] Represents those projects which generally are completed within three months or less.

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