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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, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Revenues		$ 2,281,494	$ 2,201,714	$ 2,014,021	$ 2,299,832	$ 2,403,940	$ 2,287,741	$ 2,324,202	$ 2,158,728	$ 8,797,061	$ 9,174,611	$ 8,130,631
UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues										8,366,498	8,751,352	7,715,760
United States Electrical Construction And Facilities Services | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues										1,973,427	2,216,600	1,954,323
United States Mechanical Construction And Facilities Services | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues										3,485,495	3,340,337	2,962,843
United States Building Services | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues										2,110,129	2,106,872	1,875,485
United States Industrial Services | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues										797,447	1,087,543	923,109
United Kingdom Building Services | UNITED KINGDOM
Disaggregation of Revenue [Line Items]
Revenues										430,563	423,259	414,871
Operating Segments [Member] | United States Electrical Construction And Facilities Services | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues										1,978,546	2,219,974	1,957,819
Operating Segments [Member] | United States Mechanical Construction And Facilities Services | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues										3,492,013	3,351,918	2,975,751
Intersegment Eliminations [Member] | United States Electrical Construction And Facilities Services | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues										(5,119)	(3,374)	(3,496)
Intersegment Eliminations [Member] | United States Mechanical Construction And Facilities Services | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues										(6,518)	(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										$ 971,283	$ 1,081,737	$ 839,045
Percent of individual segment										49.00%	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										$ 1,316,013	$ 1,185,129	$ 1,057,542
Percent of individual segment										38.00%	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										$ 149,363	$ 125,537	$ 110,046
Percent of individual segment										7.00%	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										$ 377,780	$ 313,409	$ 289,882
Percent of individual segment										11.00%	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										$ 23,797	$ 16,985	$ 32,338
Percent of individual segment										1.00%	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										$ 40,079	$ 35,385	$ 93,827
Percent of individual segment										1.00%	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										$ 381,542	$ 462,953	$ 388,157
Percent of individual segment										19.00%	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										$ 430,365	$ 533,699	$ 393,637
Percent of individual segment										12.00%	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										$ 79,275	$ 88,752	$ 126,218
Percent of individual segment										4.00%	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										$ 349,235	$ 304,622	$ 240,818
Percent of individual segment										10.00%	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										$ 192,656	$ 210,515	$ 284,464
Percent of individual segment										10.00%	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										$ 70,692	$ 32,686	$ 19,415
Percent of individual segment										2.00%	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										$ 6,882	$ 19,921	$ 23,337
Percent of individual segment										1.00%	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										$ 185,996	$ 202,428	$ 176,546
Percent of individual segment										5.00%	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	[1]									$ 121,061	$ 158,619	$ 120,109
Percent of individual segment										6.00%	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]									$ 343,799	$ 365,721	$ 318,413
Percent of individual segment										10.00%	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										$ 52,687	$ 54,955	$ 34,105
Percent of individual segment										3.00%	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										$ 378,054	$ 378,839	$ 385,671
Percent of individual segment										11.00%	11.00%	13.00%
Service Work [Member] | Operating Segments [Member] | United Kingdom Building Services | UNITED KINGDOM
Disaggregation of Revenue [Line Items]
Revenues										$ 221,373	$ 212,876	$ 216,880
Percent of individual segment										51.00%	50.00%	52.00%
Commercial Site-Based Services [Member] | Operating Segments [Member] | United States Building Services | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues										$ 587,345	$ 571,345	$ 519,641
Percent of individual segment										28.00%	27.00%	28.00%
Government Site-Based Services [Member] | Operating Segments [Member] | United States Building Services | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues										$ 167,990	$ 176,282	$ 213,677
Percent of individual segment										8.00%	8.00%	11.00%
Mobile Mechanical Services [Member] | Operating Segments [Member] | United States Building Services | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues										$ 1,258,916	$ 1,238,420	$ 1,032,082
Percent of individual segment										60.00%	59.00%	55.00%
Energy Services [Member] | Operating Segments [Member] | United States Building Services | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues										$ 95,878	$ 120,825	$ 110,085
Percent of individual segment										4.00%	6.00%	6.00%
Field Services [Member] | Operating Segments [Member] | United States Industrial Services | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues										$ 670,424	$ 922,308	$ 752,458
Percent of individual segment										84.00%	85.00%	82.00%
Shop Services [Member] | Operating Segments [Member] | United States Industrial Services | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues										$ 127,023	$ 165,235	$ 170,651
Percent of individual segment										16.00%	15.00%	18.00%
Project Work [Member] | Operating Segments [Member] | United Kingdom Building Services | UNITED KINGDOM
Disaggregation of Revenue [Line Items]
Revenues										$ 209,190	$ 210,383	$ 197,991
Percent of individual segment										49.00%	50.00%	48.00%
[1] Represents those projects which generally are completed within three months or less.

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