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Revenue from Contracts with Customers - Schedule of Disaggregation of Revenues (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2019	Mar. 31, 2018
Disaggregation of Revenue [Line Items]
Revenues		$ 2,158,728	$ 1,900,388
UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues		2,051,203	1,793,498
United States Electrical Construction And Facilities Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues		528,070	454,752
United States Mechanical Construction And Facilities Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues		752,409	684,750
United States Building Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues		512,079	454,752
United States Industrial Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues		258,645	199,244
United Kingdom Building Services [Member] [Member] | UNITED KINGDOM
Disaggregation of Revenue [Line Items]
Revenues		107,525	106,890
Operating Segments [Member] | United States Electrical Construction And Facilities Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues		528,870	455,782
Operating Segments [Member] | United States Mechanical Construction And Facilities Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues		755,277	687,975
Intersegment Eliminations [Member] | United States Electrical Construction And Facilities Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues		(800)	(1,030)
Intersegment Eliminations [Member] | United States Mechanical Construction And Facilities Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues		(2,868)	(3,225)
Commercial Market Sector [Member] | Operating Segments [Member] | United States Electrical Construction And Facilities Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues		$ 269,441	$ 184,382
Percent of individual segment		51.00%	40.00%
Commercial Market Sector [Member] | Operating Segments [Member] | United States Mechanical Construction And Facilities Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues		$ 281,862	$ 230,799
Percent of individual segment		37.00%	33.00%
Institutional Market Sector [Member] | Operating Segments [Member] | United States Electrical Construction And Facilities Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues		$ 22,345	$ 28,008
Percent of individual segment		4.00%	6.00%
Institutional Market Sector [Member] | Operating Segments [Member] | United States Mechanical Construction And Facilities Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues		$ 61,283	$ 64,655
Percent of individual segment		8.00%	9.00%
Hospitality Market Sector [Member] | Operating Segments [Member] | United States Electrical Construction And Facilities Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues		$ 6,841	$ 5,516
Percent of individual segment		1.00%	1.00%
Hospitality Market Sector [Member] | Operating Segments [Member] | United States Mechanical Construction And Facilities Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues		$ 13,648	$ 26,527
Percent of individual segment		2.00%	4.00%
Manufacturing Market Sector [Member] | Operating Segments [Member] | United States Electrical Construction And Facilities Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues		$ 98,803	$ 85,794
Percent of individual segment		19.00%	19.00%
Manufacturing Market Sector [Member] | Operating Segments [Member] | United States Mechanical Construction And Facilities Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues		$ 98,763	$ 92,214
Percent of individual segment		13.00%	13.00%
Healthcare Market Sector [Member] | Operating Segments [Member] | United States Electrical Construction And Facilities Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues		$ 17,615	$ 38,507
Percent of individual segment		3.00%	8.00%
Healthcare Market Sector [Member] | Operating Segments [Member] | United States Mechanical Construction And Facilities Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues		$ 61,374	$ 65,876
Percent of individual segment		8.00%	10.00%
Transportation Market Sector [Member] | Operating Segments [Member] | United States Electrical Construction And Facilities Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues		$ 58,139	$ 71,264
Percent of individual segment		11.00%	16.00%
Transportation Market Sector [Member] | Operating Segments [Member] | United States Mechanical Construction And Facilities Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues		$ 5,734	$ 5,206
Percent of individual segment		1.00%	1.00%
Water and Wastewater Market Sector [Member] | Operating Segments [Member] | United States Electrical Construction And Facilities Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues		$ 6,015	$ 4,613
Percent of individual segment		1.00%	1.00%
Water and Wastewater Market Sector [Member] | Operating Segments [Member] | United States Mechanical Construction And Facilities Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues		$ 43,211	$ 36,751
Percent of individual segment		6.00%	5.00%
Short Duration Projects [Member] | Operating Segments [Member] | United States Electrical Construction And Facilities Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues	[1]	$ 40,409	$ 29,530
Percent of individual segment		8.00%	7.00%
Short Duration Projects [Member] | Operating Segments [Member] | United States Mechanical Construction And Facilities Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues	[1]	$ 99,936	$ 79,722
Percent of individual segment		13.00%	12.00%
Service Work [Member] | United Kingdom Building Services [Member] [Member] | UNITED KINGDOM
Disaggregation of Revenue [Line Items]
Revenues		$ 54,634	$ 55,275
Percent of individual segment		51.00%	52.00%
Service Work [Member] | Operating Segments [Member] | United States Electrical Construction And Facilities Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues		$ 9,262	$ 8,168
Percent of individual segment		2.00%	2.00%
Service Work [Member] | Operating Segments [Member] | United States Mechanical Construction And Facilities Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues		$ 89,466	$ 86,225
Percent of individual segment		12.00%	13.00%
Commercial Site-Based Services [Member] | United States Building Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues		$ 155,978	$ 146,761
Percent of individual segment		30.00%	32.00%
Government Site-Based Services [Member] | United States Building Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues		$ 48,791	$ 55,409
Percent of individual segment		10.00%	12.00%
Mechanical Services [Member] | United States Building Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues		$ 274,166	$ 227,342
Percent of individual segment		54.00%	50.00%
Energy Services [Member] | United States Building Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues		$ 33,144	$ 25,240
Percent of individual segment		6.00%	6.00%
Field Services [Member] | United States Industrial Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues		$ 216,770	$ 162,187
Percent of individual segment		84.00%	81.00%
Shop Services [Member] | United States Industrial Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues		$ 41,875	$ 37,057
Percent of individual segment		16.00%	19.00%
Projects & Extras [Member] | United Kingdom Building Services [Member] [Member] | UNITED KINGDOM
Disaggregation of Revenue [Line Items]
Revenues		$ 52,891	$ 51,615
Percent of individual segment		49.00%	48.00%
[1] Represents those projects which generally are completed within three months or less.

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