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Revenue from Contracts with Customers - Schedule of Disaggregation of Revenues (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 2,707,388	$ 2,437,666	$ 5,299,937	$ 4,741,715
UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		2,592,840	2,307,792	5,053,892	4,485,106
United States Electrical Construction And Facilities Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		564,112	492,130	1,086,142	951,525
United States Electrical Construction And Facilities Services [Member] | UNITED STATES | Operating Segments [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		565,753	492,737	1,088,763	953,342
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		$ 299,206	$ 254,456	$ 569,521	$ 500,297
Percent of individual segment		53.00%	51.00%	52.00%	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		$ 65,304	$ 52,114	$ 131,769	$ 100,568
Percent of individual segment		11.00%	10.00%	12.00%	10.00%
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		$ 43,278	$ 25,847	$ 75,348	$ 45,998
Percent of individual segment		8.00%	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		$ 37,689	$ 53,181	$ 69,455	$ 96,820
Percent of individual segment		7.00%	11.00%	6.00%	10.00%
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		$ 42,440	$ 53,179	$ 87,522	$ 95,210
Percent of individual segment		7.00%	11.00%	8.00%	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		$ 5,184	$ 1,877	$ 10,496	$ 5,528
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		$ 2,689	$ 4,100	$ 5,312	$ 8,764
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]	$ 52,868	$ 38,173	$ 108,916	$ 82,582
Percent of individual segment		9.00%	8.00%	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		$ 17,095	$ 9,810	$ 30,424	$ 17,575
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		$ (1,641)	$ (607)	$ (2,621)	$ (1,817)
United States Mechanical Construction And Facilities Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		1,066,347	968,664	2,066,817	1,883,165
United States Mechanical Construction And Facilities Services [Member] | UNITED STATES | Operating Segments [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		1,068,976	969,859	2,071,714	1,886,031
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		$ 401,778	$ 396,824	$ 781,382	$ 763,301
Percent of individual segment		38.00%	41.00%	38.00%	41.00%
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		$ 155,290	$ 118,109	$ 304,861	$ 239,795
Percent of individual segment		14.00%	12.00%	15.00%	13.00%
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		$ 127,253	$ 121,412	$ 247,304	$ 234,068
Percent of individual segment		12.00%	13.00%	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		$ 92,440	$ 71,464	$ 163,067	$ 140,768
Percent of individual segment		9.00%	7.00%	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		$ 16,246	$ 20,704	$ 32,299	$ 39,121
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		$ 67,746	$ 44,702	$ 129,490	$ 88,550
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		$ 8,300	$ 11,258	$ 16,379	$ 19,787
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]	$ 85,216	$ 81,829	$ 180,310	$ 168,594
Percent of individual segment		8.00%	8.00%	9.00%	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		$ 114,707	$ 103,557	$ 216,622	$ 192,047
Percent of individual segment		11.00%	11.00%	10.00%	10.00%
United States Mechanical Construction And Facilities Services [Member] | UNITED STATES | Intersegment Eliminations [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ (2,629)	$ (1,195)	$ (4,897)	$ (2,866)
United States Building Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		677,847	611,835	1,305,648	1,179,871
United States Building Services [Member] | UNITED STATES | Mobile Mechanical Services [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 439,326	$ 412,397	$ 812,897	$ 763,714
Percent of individual segment		65.00%	67.00%	62.00%	65.00%
United States Building Services [Member] | UNITED STATES | Commercial Site-Based Services [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 193,082	$ 152,851	$ 396,632	$ 328,498
Percent of individual segment		28.00%	25.00%	31.00%	28.00%
United States Building Services [Member] | UNITED STATES | Government Site-Based Services [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 45,439	$ 46,587	$ 96,119	$ 87,659
Percent of individual segment		7.00%	8.00%	7.00%	7.00%
United States Industrial Services [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 284,534	$ 235,163	$ 595,285	$ 470,545
United States Industrial Services [Member] | UNITED STATES | Field Services [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 247,542	$ 208,797	$ 518,960	$ 416,351
Percent of individual segment		87.00%	89.00%	87.00%	88.00%
United States Industrial Services [Member] | UNITED STATES | Shop Services [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 36,992	$ 26,366	$ 76,325	$ 54,194
Percent of individual segment		13.00%	11.00%	13.00%	12.00%
United Kingdom Building Services [Member] [Member] | UNITED KINGDOM
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 114,548	$ 129,874	$ 246,045	$ 256,609
United Kingdom Building Services [Member] [Member] | UNITED KINGDOM | Service Work [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 54,261	$ 66,572	$ 119,078	$ 128,563
Percent of individual segment		47.00%	51.00%	48.00%	50.00%
United Kingdom Building Services [Member] [Member] | UNITED KINGDOM | Project Work [Member]
Disaggregation of Revenue [Line Items]
Revenues from unrelated entities		$ 60,287	$ 63,302	$ 126,967	$ 128,046
Percent of individual segment		53.00%	49.00%	52.00%	50.00%
[1] Represents those projects which generally are completed within three months or less.

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