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Revenue from Contracts with Customers - Schedule of Disaggregation of Revenues (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 2,826,361	$ 2,521,672	$ 8,126,298	$ 7,263,387
UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		2,708,660	2,392,192	7,762,552	6,877,298
United States Electrical Construction And Facilities Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		633,383	530,950	1,719,525	1,482,475
United States Electrical Construction And Facilities Services [Member] | UNITED STATES | Operating Segments [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		634,327	531,606	1,723,090	1,484,948
United States Electrical Construction And Facilities Services [Member] | UNITED STATES | Operating Segments [Member] | Commercial Market Sector [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 339,478	$ 275,824	$ 908,999	$ 776,121
Percent of individual segment		54.00%	52.00%	53.00%	52.00%
United States Electrical Construction And Facilities Services [Member] | UNITED STATES | Operating Segments [Member] | Manufacturing Market Sector [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 78,562	$ 61,618	$ 210,331	$ 162,186
Percent of individual segment		12.00%	12.00%	12.00%	11.00%
United States Electrical Construction And Facilities Services [Member] | UNITED STATES | Operating Segments [Member] | Healthcare Market Sector [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 43,911	$ 29,419	$ 119,259	$ 75,417
Percent of individual segment		7.00%	5.00%	7.00%	5.00%
United States Electrical Construction And Facilities Services [Member] | UNITED STATES | Operating Segments [Member] | Institutional Market Sector [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 46,344	$ 42,153	$ 115,799	$ 138,973
Percent of individual segment		7.00%	8.00%	6.00%	9.00%
United States Electrical Construction And Facilities Services [Member] | UNITED STATES | Operating Segments [Member] | Transportation Market Sector [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 40,525	$ 49,578	$ 128,047	$ 144,788
Percent of individual segment		6.00%	9.00%	7.00%	10.00%
United States Electrical Construction And Facilities Services [Member] | UNITED STATES | Operating Segments [Member] | Water and Wastewater Market Sector [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 5,466	$ 4,381	$ 15,962	$ 9,909
Percent of individual segment		1.00%	1.00%	1.00%	1.00%
United States Electrical Construction And Facilities Services [Member] | UNITED STATES | Operating Segments [Member] | Hospitality Market Sector [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 4,575	$ 2,522	$ 9,887	$ 11,286
Percent of individual segment		1.00%	1.00%	1.00%	1.00%
United States Electrical Construction And Facilities Services [Member] | UNITED STATES | Operating Segments [Member] | Short Duration Projects [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities	[1]	$ 58,637	$ 54,678	$ 167,553	$ 137,260
Percent of individual segment		9.00%	10.00%	10.00%	9.00%
United States Electrical Construction And Facilities Services [Member] | UNITED STATES | Operating Segments [Member] | Service Work [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 16,829	$ 11,433	$ 47,253	$ 29,008
Percent of individual segment		3.00%	2.00%	3.00%	2.00%
United States Electrical Construction And Facilities Services [Member] | UNITED STATES | Intersegment Eliminations [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ (944)	$ (656)	$ (3,565)	$ (2,473)
United States Mechanical Construction And Facilities Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		1,117,388	1,004,407	3,184,205	2,887,572
United States Mechanical Construction And Facilities Services [Member] | UNITED STATES | Operating Segments [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		1,120,634	1,005,886	3,192,348	2,891,917
United States Mechanical Construction And Facilities Services [Member] | UNITED STATES | Operating Segments [Member] | Commercial Market Sector [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 444,515	$ 369,791	$ 1,225,897	$ 1,133,092
Percent of individual segment		40.00%	37.00%	38.00%	39.00%
United States Mechanical Construction And Facilities Services [Member] | UNITED STATES | Operating Segments [Member] | Manufacturing Market Sector [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 156,524	$ 154,644	$ 461,385	$ 394,439
Percent of individual segment		14.00%	15.00%	15.00%	14.00%
United States Mechanical Construction And Facilities Services [Member] | UNITED STATES | Operating Segments [Member] | Healthcare Market Sector [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 120,562	$ 123,415	$ 367,866	$ 357,483
Percent of individual segment		11.00%	12.00%	12.00%	12.00%
United States Mechanical Construction And Facilities Services [Member] | UNITED STATES | Operating Segments [Member] | Institutional Market Sector [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 104,306	$ 74,867	$ 267,373	$ 215,635
Percent of individual segment		9.00%	8.00%	8.00%	7.00%
United States Mechanical Construction And Facilities Services [Member] | UNITED STATES | Operating Segments [Member] | Transportation Market Sector [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 15,494	$ 23,954	$ 47,793	$ 63,075
Percent of individual segment		1.00%	2.00%	1.00%	2.00%
United States Mechanical Construction And Facilities Services [Member] | UNITED STATES | Operating Segments [Member] | Water and Wastewater Market Sector [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 66,667	$ 53,367	$ 196,157	$ 141,917
Percent of individual segment		6.00%	5.00%	6.00%	5.00%
United States Mechanical Construction And Facilities Services [Member] | UNITED STATES | Operating Segments [Member] | Hospitality Market Sector [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 6,513	$ 10,806	$ 22,892	$ 30,593
Percent of individual segment		1.00%	1.00%	1.00%	1.00%
United States Mechanical Construction And Facilities Services [Member] | UNITED STATES | Operating Segments [Member] | Short Duration Projects [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities	[1]	$ 77,261	$ 78,218	$ 257,571	$ 246,812
Percent of individual segment		7.00%	8.00%	8.00%	9.00%
United States Mechanical Construction And Facilities Services [Member] | UNITED STATES | Operating Segments [Member] | Service Work [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 128,792	$ 116,824	$ 345,414	$ 308,871
Percent of individual segment		11.00%	12.00%	11.00%	11.00%
United States Mechanical Construction And Facilities Services [Member] | UNITED STATES | Intersegment Eliminations [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ (3,246)	$ (1,479)	$ (8,143)	$ (4,345)
United States Building Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		710,650	624,617	2,016,298	1,804,488
United States Building Services [Member] | UNITED STATES | Mobile Mechanical Services [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 462,401	$ 408,949	$ 1,275,298	$ 1,172,663
Percent of individual segment		65.00%	65.00%	63.00%	65.00%
United States Building Services [Member] | UNITED STATES | Commercial Site-Based Services [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 199,957	$ 166,375	$ 596,589	$ 494,873
Percent of individual segment		28.00%	27.00%	30.00%	27.00%
United States Building Services [Member] | UNITED STATES | Government Site-Based Services [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 48,292	$ 49,293	$ 144,411	$ 136,952
Percent of individual segment		7.00%	8.00%	7.00%	8.00%
United States Industrial Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 247,239	$ 232,218	$ 842,524	$ 702,763
United States Industrial Services [Member] | UNITED STATES | Field Services [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 213,866	$ 196,846	$ 732,826	$ 613,197
Percent of individual segment		87.00%	85.00%	87.00%	87.00%
United States Industrial Services [Member] | UNITED STATES | Shop Services [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 33,373	$ 35,372	$ 109,698	$ 89,566
Percent of individual segment		13.00%	15.00%	13.00%	13.00%
United Kingdom Building Services [Member] [Member] | UNITED KINGDOM
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 117,701	$ 129,480	$ 363,746	$ 386,089
United Kingdom Building Services [Member] [Member] | UNITED KINGDOM | Service Work [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 51,762	$ 65,486	$ 170,840	$ 194,049
Percent of individual segment		44.00%	51.00%	47.00%	50.00%
United Kingdom Building Services [Member] [Member] | UNITED KINGDOM | Project Work [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 65,939	$ 63,994	$ 192,906	$ 192,040
Percent of individual segment		56.00%	49.00%	53.00%	50.00%
[1] Represents those projects which generally are completed within three months or less.

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