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Revenue from Contracts with Customers - Schedule of Disaggregation of Revenues (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2021	Mar. 31, 2020
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 2,304,049	$ 2,299,832
UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		2,177,314	2,187,455
United States Electrical Construction And Facilities Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		456,168	461,803
United States Electrical Construction And Facilities Services [Member] | UNITED STATES | Operating Segments [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		457,363	462,615
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		$ 244,983	$ 239,846
Percent of individual segment		53.00%	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		$ 43,129	$ 37,393
Percent of individual segment		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		$ 4,664	$ 5,082
Percent of individual segment		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		$ 48,423	$ 66,843
Percent of individual segment		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		$ 19,414	$ 19,225
Percent of individual segment		4.00%	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		$ 42,031	$ 44,180
Percent of individual segment		9.00%	9.00%
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		$ 3,651	$ 2,329
Percent of individual segment		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]	$ 43,800	$ 40,270
Percent of individual segment		10.00%	9.00%
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		$ 7,268	$ 7,447
Percent of individual segment		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		$ (1,195)	$ (812)
United States Mechanical Construction And Facilities Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		903,925	834,112
United States Mechanical Construction And Facilities Services [Member] | UNITED STATES | Operating Segments [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		905,546	835,996
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		$ 366,675	$ 304,690
Percent of individual segment		40.00%	36.00%
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		$ 69,304	$ 76,997
Percent of individual segment		8.00%	9.00%
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		$ 8,529	$ 7,714
Percent of individual segment		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		$ 105,427	$ 115,582
Percent of individual segment		12.00%	14.00%
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		$ 112,785	$ 88,059
Percent of individual segment		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		$ 18,417	$ 14,346
Percent of individual segment		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		$ 43,848	$ 40,513
Percent of individual segment		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]	$ 88,783	$ 97,202
Percent of individual segment		10.00%	12.00%
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		$ 91,778	$ 90,893
Percent of individual segment		10.00%	11.00%
United States Mechanical Construction And Facilities Services [Member] | UNITED STATES | Intersegment Eliminations [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ (1,621)	$ (1,884)
United States Building Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		581,839	527,611
United States Building Services [Member] | UNITED STATES | Commercial Site-Based Services [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 175,647	$ 143,438
Percent of individual segment		30.00%	27.00%
United States Building Services [Member] | UNITED STATES | Government Site-Based Services [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 41,072	$ 42,917
Percent of individual segment		7.00%	8.00%
United States Building Services [Member] | UNITED STATES | Mobile Mechanical Services [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 334,950	$ 312,919
Percent of individual segment		58.00%	59.00%
United States Building Services [Member] | UNITED STATES | Energy Services [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 30,170	$ 28,337
Percent of individual segment		5.00%	6.00%
United States Industrial Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 235,382	$ 363,929
United States Industrial Services [Member] | UNITED STATES | Field Services [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 207,554	$ 323,654
Percent of individual segment		88.00%	89.00%
United States Industrial Services [Member] | UNITED STATES | Shop Services [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 27,828	$ 40,275
Percent of individual segment		12.00%	11.00%
United Kingdom Building Services [Member] [Member] | UNITED KINGDOM
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 126,735	$ 112,377
United Kingdom Building Services [Member] [Member] | UNITED KINGDOM | Service Work [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 61,991	$ 55,106
Percent of individual segment		49.00%	49.00%
United Kingdom Building Services [Member] [Member] | UNITED KINGDOM | Project Work [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 64,744	$ 57,271
Percent of individual segment		51.00%	51.00%
[1] Represents those projects which generally are completed within three months or less.

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