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Revenue from Contracts with Customers - Schedule of Disaggregation of Revenues (Details) - USD ($) $ in Thousands		3 Months Ended								12 Months Ended
		Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Revenues		$ 2,403,940	$ 2,287,741	$ 2,324,202	$ 2,158,728	$ 2,229,308	$ 2,047,049	$ 1,953,886	$ 1,900,388	$ 9,174,611	$ 8,130,631	$ 7,686,999
UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues										8,751,352	7,715,760	7,346,254
United States Electrical Construction And Facilities Services | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues										2,216,600	1,954,323	1,829,567
United States Mechanical Construction And Facilities Services | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues										3,340,337	2,962,843	2,880,148
United States Building Services | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues										2,106,872	1,875,485	1,753,703
United States Industrial Services | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues										1,087,543	923,109	882,836
United Kingdom Building Services | UNITED KINGDOM
Disaggregation of Revenue [Line Items]
Revenues										423,259	414,871	$ 340,745
Operating Segments [Member] | United States Electrical Construction And Facilities Services | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues										2,219,974	1,957,819
Operating Segments [Member] | United States Mechanical Construction And Facilities Services | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues										3,351,918	2,975,751
Intersegment Eliminations [Member] | United States Electrical Construction And Facilities Services | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues										(3,374)	(3,496)
Intersegment Eliminations [Member] | United States Mechanical Construction And Facilities Services | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues										(11,581)	(12,908)
Commercial Market Sector [Member] | Operating Segments [Member] | United States Electrical Construction And Facilities Services | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues										$ 1,081,737	$ 839,045
Percent of individual segment										49.00%	43.00%
Commercial Market Sector [Member] | Operating Segments [Member] | United States Mechanical Construction And Facilities Services | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues										$ 1,185,129	$ 1,057,542
Percent of individual segment										36.00%	35.00%
Institutional Market Sector [Member] | Operating Segments [Member] | United States Electrical Construction And Facilities Services | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues										$ 125,537	$ 110,046
Percent of individual segment										6.00%	6.00%
Institutional Market Sector [Member] | Operating Segments [Member] | United States Mechanical Construction And Facilities Services | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues										$ 313,409	$ 289,882
Percent of individual segment										9.00%	10.00%
Hospitality Market Sector [Member] | Operating Segments [Member] | United States Electrical Construction And Facilities Services | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues										$ 16,985	$ 32,338
Percent of individual segment										1.00%	2.00%
Hospitality Market Sector [Member] | Operating Segments [Member] | United States Mechanical Construction And Facilities Services | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues										$ 35,385	$ 93,827
Percent of individual segment										1.00%	3.00%
Manufacturing Market Sector [Member] | Operating Segments [Member] | United States Electrical Construction And Facilities Services | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues										$ 462,953	$ 388,157
Percent of individual segment										21.00%	20.00%
Manufacturing Market Sector [Member] | Operating Segments [Member] | United States Mechanical Construction And Facilities Services | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues										$ 533,699	$ 393,637
Percent of individual segment										16.00%	13.00%
Healthcare Market Sector [Member] | Operating Segments [Member] | United States Electrical Construction And Facilities Services | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues										$ 88,752	$ 126,218
Percent of individual segment										4.00%	6.00%
Healthcare Market Sector [Member] | Operating Segments [Member] | United States Mechanical Construction And Facilities Services | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues										$ 304,622	$ 240,818
Percent of individual segment										9.00%	8.00%
Transportation Market Sector [Member] | Operating Segments [Member] | United States Electrical Construction And Facilities Services | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues										$ 210,515	$ 284,464
Percent of individual segment										9.00%	14.00%
Transportation Market Sector [Member] | Operating Segments [Member] | United States Mechanical Construction And Facilities Services | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues										$ 32,686	$ 19,415
Percent of individual segment										1.00%	1.00%
Water and Wastewater Market Sector [Member] | Operating Segments [Member] | United States Electrical Construction And Facilities Services | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues										$ 19,921	$ 23,337
Percent of individual segment										1.00%	1.00%
Water and Wastewater Market Sector [Member] | Operating Segments [Member] | United States Mechanical Construction And Facilities Services | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues										$ 202,428	$ 176,546
Percent of individual segment										6.00%	6.00%
Short Duration Projects [Member] | Operating Segments [Member] | United States Electrical Construction And Facilities Services | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues										$ 158,619	$ 120,109
Percent of individual segment										7.00%	6.00%
Short Duration Projects [Member] | Operating Segments [Member] | United States Mechanical Construction And Facilities Services | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues	[1]									$ 365,721	$ 318,413
Percent of individual segment										11.00%	11.00%
Service Work [Member] | Operating Segments [Member] | United States Electrical Construction And Facilities Services | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues										$ 54,955	$ 34,105
Percent of individual segment										2.00%	2.00%
Service Work [Member] | Operating Segments [Member] | United States Mechanical Construction And Facilities Services | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues										$ 378,839	$ 385,671
Percent of individual segment										11.00%	13.00%
Service Work [Member] | Operating Segments [Member] | United Kingdom Building Services | UNITED KINGDOM
Disaggregation of Revenue [Line Items]
Revenues										$ 212,876	$ 216,880
Percent of individual segment										50.00%	52.00%
Commercial Site-Based Services [Member] | Operating Segments [Member] | United States Building Services | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues										$ 571,345	$ 519,641
Percent of individual segment										27.00%	28.00%
Government Site-Based Services [Member] | Operating Segments [Member] | United States Building Services | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues										$ 176,282	$ 213,677
Percent of individual segment										8.00%	11.00%
Mechanical Services [Member] | Operating Segments [Member] | United States Building Services | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues										$ 1,238,420	$ 1,032,082
Percent of individual segment										59.00%	55.00%
Energy Services [Member] | Operating Segments [Member] | United States Building Services | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues										$ 120,825	$ 110,085
Percent of individual segment										6.00%	6.00%
Field Services [Member] | Operating Segments [Member] | United States Industrial Services | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues										$ 922,308	$ 752,458
Percent of individual segment										85.00%	82.00%
Shop Services [Member] | Operating Segments [Member] | United States Industrial Services | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues										$ 165,235	$ 170,651
Percent of individual segment										15.00%	18.00%
Projects & Extras [Member] | Operating Segments [Member] | United Kingdom Building Services | UNITED KINGDOM
Disaggregation of Revenue [Line Items]
Revenues										$ 210,383	$ 197,991
Percent of individual segment										50.00%	48.00%
[1] Represents those projects which generally are completed within three months or less.

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
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-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

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-Publisher FASB
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