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Revenue from Contracts with Customers - Schedule of Disaggregation of Revenue (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($)
Disaggregation of Revenue [Line Items]
Revenues, disaggregation	$ 1,900,388
UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues, disaggregation	1,793,498
United States Electrical Construction And Facilities Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues, disaggregation	454,752
United States Mechanical Construction And Facilities Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues, disaggregation	698,847
United States Building Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues, disaggregation	454,752
United States Industrial Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues, disaggregation	185,147
United Kingdom Building Services [Member] [Member] | UNITED KINGDOM
Disaggregation of Revenue [Line Items]
Revenues, disaggregation	106,890
Operating Segments [Member] | United States Electrical Construction And Facilities Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues, disaggregation	455,782
Operating Segments [Member] | United States Mechanical Construction And Facilities Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues, disaggregation	702,072
Intersegment Eliminations [Member] | United States Electrical Construction And Facilities Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues, disaggregation	(1,030)
Intersegment Eliminations [Member] | United States Mechanical Construction And Facilities Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues, disaggregation	(3,225)
Commercial Market Sector [Member] | United States Electrical Construction And Facilities Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues, disaggregation	$ 184,382
Percent of total segment	40.00%
Commercial Market Sector [Member] | United States Mechanical Construction And Facilities Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues, disaggregation	$ 231,851
Percent of total segment	33.00%
Institutional Market Sector [Member] | United States Electrical Construction And Facilities Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues, disaggregation	$ 28,008
Percent of total segment	6.00%
Institutional Market Sector [Member] | United States Mechanical Construction And Facilities Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues, disaggregation	$ 65,627
Percent of total segment	9.00%
Hospitality Market Sector [Member] | United States Electrical Construction And Facilities Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues, disaggregation	$ 5,516
Percent of total segment	1.00%
Hospitality Market Sector [Member] | United States Mechanical Construction And Facilities Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues, disaggregation	$ 26,527
Percent of total segment	4.00%
Manufacturing Market Sector [Member] | United States Electrical Construction And Facilities Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues, disaggregation	$ 85,794
Percent of total segment	19.00%
Manufacturing Market Sector [Member] | United States Mechanical Construction And Facilities Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues, disaggregation	$ 99,876
Percent of total segment	14.00%
Healthcare Market Sector [Member] | United States Electrical Construction And Facilities Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues, disaggregation	$ 38,507
Percent of total segment	8.00%
Healthcare Market Sector [Member] | United States Mechanical Construction And Facilities Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues, disaggregation	$ 66,114
Percent of total segment	10.00%
Transportation Market Sector [Member] | United States Electrical Construction And Facilities Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues, disaggregation	$ 71,264
Percent of total segment	16.00%
Transportation Market Sector [Member] | United States Mechanical Construction And Facilities Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues, disaggregation	$ 5,206
Percent of total segment	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	$ 4,613
Percent of total segment	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	$ 36,751
Percent of total segment	5.00%
Short Duration Projects [Member] | United States Electrical Construction And Facilities Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues, disaggregation	$ 29,530	[1]
Percent of total segment	7.00%
Short Duration Projects [Member] | United States Mechanical Construction And Facilities Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues, disaggregation	$ 83,895	[1]
Percent of total segment	12.00%
Service Work [Member] | United States Electrical Construction And Facilities Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues, disaggregation	$ 8,168
Percent of total segment	2.00%
Service Work [Member] | United States Mechanical Construction And Facilities Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues, disaggregation	$ 86,225
Percent of total segment	12.00%
Service Work [Member] | United Kingdom Building Services [Member] [Member] | UNITED KINGDOM
Disaggregation of Revenue [Line Items]
Revenues, disaggregation	$ 55,275
Percent of total segment	52.00%
Commercial Site-Based Services [Member] | United States Building Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues, disaggregation	$ 146,761
Percent of total segment	32.00%
Government Site-Based Services [Member] | United States Building Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues, disaggregation	$ 55,409
Percent of total segment	12.00%
Mechanical Services [Member] | United States Building Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues, disaggregation	$ 227,342
Percent of total segment	50.00%
Energy Services [Member] | United States Building Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues, disaggregation	$ 25,240
Percent of total segment	6.00%
Field Services [Member] | United States Industrial Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues, disaggregation	$ 148,090
Percent of total segment	80.00%
Shop Services [Member] | United States Industrial Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues, disaggregation	$ 37,057
Percent of total segment	20.00%
Projects & Extras [Member] | United Kingdom Building Services [Member] [Member] | UNITED KINGDOM
Disaggregation of Revenue [Line Items]
Revenues, disaggregation	$ 51,615
Percent of total segment	48.00%
[1] Represents those projects which generally are completed within three months or less.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 32
-Paragraph 2A
-URI http://asc.fasb.org/extlink&oid=82859839&loc=SL82860478-203043

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
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-Name Accounting Standards Codification
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