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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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