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Revenue from Contracts with Customers - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Disaggregation of Revenue [Line Items]
Revenues, disaggregation		$ 2,047,049	$ 1,886,691	$ 5,901,323	$ 5,674,360
UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues, disaggregation		1,946,483	1,800,789	5,588,360	5,430,282
United States Electrical Construction And Facilities Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues, disaggregation		485,974	457,919	1,420,268	1,350,157
United States Mechanical Construction And Facilities Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues, disaggregation		772,332	760,084	2,211,836	2,173,030
United States Building Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues, disaggregation		473,701	437,107	1,389,486	1,315,401
United States Industrial Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues, disaggregation		214,476	145,679	566,770	591,694
United Kingdom Building Services [Member] [Member] | UNITED KINGDOM
Disaggregation of Revenue [Line Items]
Revenues, disaggregation		100,566	$ 85,902	312,963	$ 244,078
Operating Segments [Member] | United States Electrical Construction And Facilities Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues, disaggregation		486,349		1,423,142
Operating Segments [Member] | United States Mechanical Construction And Facilities Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues, disaggregation		775,316		2,221,029
Intersegment Eliminations [Member] | United States Electrical Construction And Facilities Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues, disaggregation		(375)		(2,874)
Intersegment Eliminations [Member] | United States Mechanical Construction And Facilities Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues, disaggregation		(2,984)		(9,193)
Commercial Market Sector [Member] | United States Electrical Construction And Facilities Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues, disaggregation		$ 196,293		$ 579,958
Percent of total segment		40.00%		41.00%
Commercial Market Sector [Member] | United States Mechanical Construction And Facilities Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues, disaggregation		$ 289,032		$ 784,543
Percent of total segment		37.00%		35.00%
Institutional Market Sector [Member] | United States Electrical Construction And Facilities Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues, disaggregation		$ 27,903		$ 86,971
Percent of total segment		6.00%		6.00%
Institutional Market Sector [Member] | United States Mechanical Construction And Facilities Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues, disaggregation		$ 78,084		$ 221,790
Percent of total segment		10.00%		10.00%
Hospitality Market Sector [Member] | United States Electrical Construction And Facilities Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues, disaggregation		$ 9,860		$ 22,665
Percent of total segment		2.00%		2.00%
Hospitality Market Sector [Member] | United States Mechanical Construction And Facilities Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues, disaggregation		$ 26,170		$ 73,888
Percent of total segment		3.00%		3.00%
Manufacturing Market Sector [Member] | United States Electrical Construction And Facilities Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues, disaggregation		$ 100,563		$ 280,375
Percent of total segment		20.00%		20.00%
Manufacturing Market Sector [Member] | United States Mechanical Construction And Facilities Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues, disaggregation		$ 96,203		$ 295,126
Percent of total segment		12.00%		13.00%
Healthcare Market Sector [Member] | United States Electrical Construction And Facilities Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues, disaggregation		$ 28,121		$ 103,307
Percent of total segment		6.00%		7.00%
Healthcare Market Sector [Member] | United States Mechanical Construction And Facilities Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues, disaggregation		$ 55,844		$ 181,964
Percent of total segment		7.00%		8.00%
Transportation Market Sector [Member] | United States Electrical Construction And Facilities Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues, disaggregation		$ 72,816		$ 216,591
Percent of total segment		15.00%		15.00%
Transportation Market Sector [Member] | United States Mechanical Construction And Facilities Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues, disaggregation		$ 3,072		$ 13,002
Percent of total segment		1.00%		1.00%
Water and Wastewater Market Sector [Member] | United States Electrical Construction And Facilities Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues, disaggregation		$ 4,194		$ 14,947
Percent of total segment		1.00%		1.00%
Water and Wastewater Market Sector [Member] | United States Mechanical Construction And Facilities Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues, disaggregation		$ 43,032		$ 122,302
Percent of total segment		6.00%		6.00%
Short Duration Projects [Member] | United States Electrical Construction And Facilities Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues, disaggregation	[1]	$ 38,452		$ 93,177
Percent of total segment		8.00%		6.00%
Short Duration Projects [Member] | United States Mechanical Construction And Facilities Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues, disaggregation	[1]	$ 76,711		$ 236,720
Percent of total segment		10.00%		11.00%
Service Work [Member] | United States Electrical Construction And Facilities Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues, disaggregation		$ 8,147		$ 25,151
Percent of total segment		2.00%		2.00%
Service Work [Member] | United States Mechanical Construction And Facilities Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues, disaggregation		$ 107,168		$ 291,694
Percent of total segment		14.00%		13.00%
Service Work [Member] | United Kingdom Building Services [Member] [Member] | UNITED KINGDOM
Disaggregation of Revenue [Line Items]
Revenues, disaggregation		$ 51,815		$ 162,088
Percent of total segment		52.00%		52.00%
Commercial Site-Based Services [Member] | United States Building Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues, disaggregation		$ 120,917		$ 386,721
Percent of total segment		26.00%		28.00%
Government Site-Based Services [Member] | United States Building Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues, disaggregation		$ 52,332		$ 162,888
Percent of total segment		11.00%		12.00%
Mechanical Services [Member] | United States Building Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues, disaggregation		$ 276,722		$ 764,313
Percent of total segment		58.00%		55.00%
Energy Services [Member] | United States Building Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues, disaggregation		$ 23,730		$ 75,564
Percent of total segment		5.00%		5.00%
Field Services [Member] | United States Industrial Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues, disaggregation		$ 169,036		$ 442,653
Percent of total segment		79.00%		78.00%
Shop Services [Member] | United States Industrial Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues, disaggregation		$ 45,440		$ 124,117
Percent of total segment		21.00%		22.00%
Projects & Extras [Member] | United Kingdom Building Services [Member] [Member] | UNITED KINGDOM
Disaggregation of Revenue [Line Items]
Revenues, disaggregation		$ 48,751		$ 150,875
Percent of total segment		48.00%		48.00%
[1] Represents those projects which generally are completed within three months or less.

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