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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, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 2,521,672	$ 2,201,714	$ 7,263,387	$ 6,515,567
UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		2,392,192	2,091,639	6,877,298	6,199,998
United States Electrical Construction And Facilities Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		527,935	472,084	1,473,590	1,344,275
United States Electrical Construction And Facilities Services [Member] | UNITED STATES | Operating Segments [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		528,591	473,892	1,476,034	1,347,729
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		$ 274,954	$ 252,197	$ 773,711	$ 704,361
Percent of individual segment		52.00%	53.00%	52.00%	52.00%
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		$ 42,002	$ 36,230	$ 137,718	$ 106,314
Percent of individual segment		8.00%	8.00%	9.00%	8.00%
United States Electrical Construction And Facilities Services [Member] | UNITED STATES | Operating Segments [Member] | Hospitality Market Sector [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 2,522	$ 7,028	$ 11,286	$ 17,009
Percent of individual segment		1.00%	1.00%	1.00%	1.00%
United States Electrical Construction And Facilities Services [Member] | UNITED STATES | Operating Segments [Member] | Manufacturing Market Sector [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 60,965	$ 62,537	$ 161,386	$ 185,290
Percent of individual segment		11.00%	13.00%	11.00%	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		$ 29,377	$ 16,929	$ 74,469	$ 52,179
Percent of individual segment		6.00%	4.00%	5.00%	4.00%
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		$ 49,578	$ 58,765	$ 144,788	$ 150,911
Percent of individual segment		9.00%	12.00%	10.00%	11.00%
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		$ 4,381	$ 2,351	$ 9,909	$ 6,587
Percent of individual segment		1.00%	1.00%	1.00%	1.00%
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]	$ 53,881	$ 31,008	$ 135,165	$ 104,785
Percent of individual segment		10.00%	7.00%	9.00%	8.00%
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		$ 10,931	$ 6,847	$ 27,602	$ 20,293
Percent of individual segment		2.00%	1.00%	2.00%	1.00%
United States Electrical Construction And Facilities Services [Member] | UNITED STATES | Intersegment Eliminations [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ (656)	$ (1,808)	$ (2,444)	$ (3,454)
United States Mechanical Construction And Facilities Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		999,584	891,509	2,862,195	2,516,062
United States Mechanical Construction And Facilities Services [Member] | UNITED STATES | Operating Segments [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		1,001,492	893,667	2,867,461	2,521,074
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		$ 369,654	$ 346,911	$ 1,133,811	$ 925,035
Percent of individual segment		37.00%	39.00%	40.00%	37.00%
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		$ 74,867	$ 112,264	$ 215,635	$ 289,090
Percent of individual segment		8.00%	13.00%	8.00%	12.00%
United States Mechanical Construction And Facilities Services [Member] | UNITED STATES | Operating Segments [Member] | Hospitality Market Sector [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 10,806	$ 12,570	$ 30,593	$ 29,382
Percent of individual segment		1.00%	1.00%	1.00%	1.00%
United States Mechanical Construction And Facilities Services [Member] | UNITED STATES | Operating Segments [Member] | Manufacturing Market Sector [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 142,250	$ 93,919	$ 349,901	$ 310,109
Percent of individual segment		14.00%	11.00%	12.00%	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		$ 123,071	$ 78,814	$ 357,601	$ 247,401
Percent of individual segment		12.00%	9.00%	12.00%	10.00%
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		$ 23,954	$ 19,824	$ 63,075	$ 53,839
Percent of individual segment		3.00%	2.00%	2.00%	2.00%
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		$ 53,367	$ 45,255	$ 141,917	$ 131,374
Percent of individual segment		5.00%	5.00%	5.00%	5.00%
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]	$ 82,510	$ 84,461	$ 254,897	$ 255,618
Percent of individual segment		8.00%	9.00%	9.00%	10.00%
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		$ 121,013	$ 99,649	$ 320,031	$ 279,226
Percent of individual segment		12.00%	11.00%	11.00%	11.00%
United States Mechanical Construction And Facilities Services [Member] | UNITED STATES | Intersegment Eliminations [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ (1,908)	$ (2,158)	$ (5,266)	$ (5,012)
United States Building Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		632,455	556,514	1,838,750	1,563,107
United States Building Services [Member] | UNITED STATES | Commercial Site-Based Services [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 166,375	$ 147,768	$ 494,873	$ 423,284
Percent of individual segment		26.00%	27.00%	27.00%	27.00%
United States Building Services [Member] | UNITED STATES | Government Site-Based Services [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 49,293	$ 44,664	$ 136,952	$ 126,000
Percent of individual segment		8.00%	8.00%	8.00%	8.00%
United States Building Services [Member] | UNITED STATES | Mobile Mechanical Services [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 394,559	$ 341,279	$ 1,128,322	$ 943,729
Percent of individual segment		62.00%	61.00%	61.00%	61.00%
United States Building Services [Member] | UNITED STATES | Energy Services [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 22,228	$ 22,803	$ 78,603	$ 70,094
Percent of individual segment		4.00%	4.00%	4.00%	4.00%
United States Industrial Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 232,218	$ 171,532	$ 702,763	$ 776,554
United States Industrial Services [Member] | UNITED STATES | Field Services [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 196,846	$ 145,165	$ 613,197	$ 675,107
Percent of individual segment		85.00%	85.00%	87.00%	87.00%
United States Industrial Services [Member] | UNITED STATES | Shop Services [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 35,372	$ 26,367	$ 89,566	$ 101,447
Percent of individual segment		15.00%	15.00%	13.00%	13.00%
United Kingdom Building Services [Member] [Member] | UNITED KINGDOM
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 129,480	$ 110,075	$ 386,089	$ 315,569
United Kingdom Building Services [Member] [Member] | UNITED KINGDOM | Service Work [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 65,486	$ 55,594	$ 194,049	$ 161,839
Percent of individual segment		51.00%	51.00%	50.00%	51.00%
United Kingdom Building Services [Member] [Member] | UNITED KINGDOM | Project Work [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 63,994	$ 54,481	$ 192,040	$ 153,730
Percent of individual segment		49.00%	49.00%	50.00%	49.00%
[1] Represents those projects which generally are completed within three months or less.

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