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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, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | $ 2,014,021 |  | $ 2,324,202 |  | $ 4,313,853 |  | $ 4,482,930 |
UNITED STATES |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | 1,920,904 |  | 2,211,646 |  | 4,108,359 |  | 4,262,849 |
United States Electrical Construction And Facilities Services [Member] | UNITED STATES |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | 445,881 |  | 569,402 |  | 971,110 |  | 1,097,472 |
United States Mechanical Construction And Facilities Services [Member] | UNITED STATES |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | 790,441 |  | 823,086 |  | 1,624,553 |  | 1,575,495 |
United States Building Services [Member] | UNITED STATES |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | 472,416 |  | 523,698 |  | 990,499 |  | 1,035,777 |
United States Industrial Services [Member] | UNITED STATES |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | 212,166 |  | 295,460 |  | 522,197 |  | 554,105 |
United Kingdom Building Services [Member] [Member] | UNITED KINGDOM |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | 93,117 |  | 112,556 |  | 205,494 |  | 220,081 |
Operating Segments [Member] | United States Electrical Construction And Facilities Services [Member] | UNITED STATES |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | 446,716 |  | 570,021 |  | 972,701 |  | 1,098,891 |
Operating Segments [Member] | United States Mechanical Construction And Facilities Services [Member] | UNITED STATES |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | 791,411 |  | 825,365 |  | 1,627,407 |  | 1,580,642 |
Intersegment Eliminations [Member] | United States Electrical Construction And Facilities Services [Member] | UNITED STATES |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | (835) |  | (619) |  | (1,591) |  | (1,419) |
Intersegment Eliminations [Member] | United States Mechanical Construction And Facilities Services [Member] | UNITED STATES |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | (970) |  | (2,279) |  | (2,854) |  | (5,147) |
Commercial Market Sector [Member] | Operating Segments [Member] | United States Electrical Construction And Facilities Services [Member] | UNITED STATES |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | $ 215,285 |  | $ 286,290 |  | $ 458,126 |  | $ 555,731 |
Percent of individual segment | 48.00% |  | 50.00% |  | 47.00% |  | 51.00% |
Commercial Market Sector [Member] | Operating Segments [Member] | United States Mechanical Construction And Facilities Services [Member] | UNITED STATES |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | $ 273,434 |  | $ 299,448 |  | $ 578,124 |  | $ 581,310 |
Percent of individual segment | 35.00% |  | 36.00% |  | 36.00% |  | 37.00% |
Institutional Market Sector [Member] | Operating Segments [Member] | United States Electrical Construction And Facilities Services [Member] | UNITED STATES |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | $ 34,341 |  | $ 31,596 |  | $ 75,859 |  | $ 53,941 |
Percent of individual segment | 8.00% |  | 5.00% |  | 8.00% |  | 5.00% |
Institutional Market Sector [Member] | Operating Segments [Member] | United States Mechanical Construction And Facilities Services [Member] | UNITED STATES |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | $ 99,829 |  | $ 76,674 |  | $ 176,826 |  | $ 137,957 |
Percent of individual segment | 13.00% |  | 9.00% |  | 11.00% |  | 9.00% |
Hospitality Market Sector [Member] | Operating Segments [Member] | United States Electrical Construction And Facilities Services [Member] | UNITED STATES |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | $ 4,899 |  | $ 2,846 |  | $ 9,981 |  | $ 9,687 |
Percent of individual segment | 1.00% |  | 1.00% |  | 1.00% |  | 1.00% |
Hospitality Market Sector [Member] | Operating Segments [Member] | United States Mechanical Construction And Facilities Services [Member] | UNITED STATES |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | $ 9,098 |  | $ 8,271 |  | $ 16,812 |  | $ 21,919 |
Percent of individual segment | 1.00% |  | 1.00% |  | 1.00% |  | 1.00% |
Manufacturing Market Sector [Member] | Operating Segments [Member] | United States Electrical Construction And Facilities Services [Member] | UNITED STATES |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | $ 84,253 |  | $ 118,157 |  | $ 204,625 |  | $ 216,960 |
Percent of individual segment | 19.00% |  | 21.00% |  | 21.00% |  | 20.00% |
Manufacturing Market Sector [Member] | Operating Segments [Member] | United States Mechanical Construction And Facilities Services [Member] | UNITED STATES |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | $ 100,608 |  | $ 137,891 |  | $ 216,190 |  | $ 236,654 |
Percent of individual segment | 13.00% |  | 17.00% |  | 13.00% |  | 15.00% |
Healthcare Market Sector [Member] | Operating Segments [Member] | United States Electrical Construction And Facilities Services [Member] | UNITED STATES |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | $ 17,696 |  | $ 21,409 |  | $ 38,342 |  | $ 39,024 |
Percent of individual segment | 4.00% |  | 4.00% |  | 4.00% |  | 3.00% |
Healthcare Market Sector [Member] | Operating Segments [Member] | United States Mechanical Construction And Facilities Services [Member] | UNITED STATES |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | $ 80,528 |  | $ 74,653 |  | $ 168,587 |  | $ 136,027 |
Percent of individual segment | 10.00% |  | 9.00% |  | 10.00% |  | 9.00% |
Transportation Market Sector [Member] | Operating Segments [Member] | United States Electrical Construction And Facilities Services [Member] | UNITED STATES |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | $ 47,966 |  | $ 51,655 |  | $ 92,146 |  | $ 109,794 |
Percent of individual segment | 10.00% |  | 9.00% |  | 9.00% |  | 10.00% |
Transportation Market Sector [Member] | Operating Segments [Member] | United States Mechanical Construction And Facilities Services [Member] | UNITED STATES |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | $ 19,669 |  | $ 9,291 |  | $ 34,015 |  | $ 15,025 |
Percent of individual segment | 2.00% |  | 1.00% |  | 2.00% |  | 1.00% |
Water and Wastewater Market Sector [Member] | Operating Segments [Member] | United States Electrical Construction And Facilities Services [Member] | UNITED STATES |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | $ 1,907 |  | $ 4,618 |  | $ 4,236 |  | $ 10,633 |
Percent of individual segment | 1.00% |  | 1.00% |  | 1.00% |  | 1.00% |
Water and Wastewater Market Sector [Member] | Operating Segments [Member] | United States Mechanical Construction And Facilities Services [Member] | UNITED STATES |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | $ 45,606 |  | $ 45,537 |  | $ 86,119 |  | $ 88,748 |
Percent of individual segment | 6.00% |  | 6.00% |  | 5.00% |  | 6.00% |
Short Duration Projects [Member] | Operating Segments [Member] | United States Electrical Construction And Facilities Services [Member] | UNITED STATES |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | $ 30,176 | [1] | $ 41,447 | [1] | $ 62,897 | [2] | $ 81,856 | [2]
Percent of individual segment | 7.00% |  | 7.00% |  | 6.00% |  | 7.00% |
Short Duration Projects [Member] | Operating Segments [Member] | United States Mechanical Construction And Facilities Services [Member] | UNITED STATES |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | $ 73,955 | [1] | $ 81,168 | [1] | $ 171,157 | [2] | $ 181,104 | [2]
Percent of individual segment | 9.00% |  | 10.00% |  | 11.00% |  | 11.00% |
Service Work [Member] | United Kingdom Building Services [Member] [Member] | UNITED KINGDOM |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | $ 51,139 |  | $ 56,829 |  | $ 106,245 |  | $ 111,463 |
Percent of individual segment | 55.00% |  | 50.00% |  | 52.00% |  | 51.00% |
Service Work [Member] | Operating Segments [Member] | United States Electrical Construction And Facilities Services [Member] | UNITED STATES |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | $ 10,193 |  | $ 12,003 |  | $ 26,489 |  | $ 21,265 |
Percent of individual segment | 2.00% |  | 2.00% |  | 3.00% |  | 2.00% |
Service Work [Member] | Operating Segments [Member] | United States Mechanical Construction And Facilities Services [Member] | UNITED STATES |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | $ 88,684 |  | $ 92,432 |  | $ 179,577 |  | $ 181,898 |
Percent of individual segment | 11.00% |  | 11.00% |  | 11.00% |  | 11.00% |
Commercial Site-Based Services [Member] | United States Building Services [Member] | UNITED STATES |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | $ 132,078 |  | $ 130,921 |  | $ 275,516 |  | $ 286,899 |
Percent of individual segment | 28.00% |  | 25.00% |  | 28.00% |  | 28.00% |
Government Site-Based Services [Member] | United States Building Services [Member] | UNITED STATES |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | $ 38,419 |  | $ 42,787 |  | $ 81,336 |  | $ 91,578 |
Percent of individual segment | 8.00% |  | 8.00% |  | 8.00% |  | 9.00% |
Mobile Mechanical Services [Member] | United States Building Services [Member] | UNITED STATES |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | $ 282,965 |  | $ 312,822 |  | $ 586,356 |  | $ 586,988 |
Percent of individual segment | 60.00% |  | 60.00% |  | 59.00% |  | 56.00% |
Energy Services [Member] | United States Building Services [Member] | UNITED STATES |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | $ 18,954 |  | $ 37,168 |  | $ 47,291 |  | $ 70,312 |
Percent of individual segment | 4.00% |  | 7.00% |  | 5.00% |  | 7.00% |
Field Services [Member] | United States Industrial Services [Member] | UNITED STATES |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | $ 177,361 |  | $ 252,849 |  | $ 447,117 |  | $ 469,619 |
Percent of individual segment | 84.00% |  | 86.00% |  | 86.00% |  | 85.00% |
Shop Services [Member] | United States Industrial Services [Member] | UNITED STATES |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | $ 34,805 |  | $ 42,611 |  | $ 75,080 |  | $ 84,486 |
Percent of individual segment | 16.00% |  | 14.00% |  | 14.00% |  | 15.00% |
Project Work [Member] | United Kingdom Building Services [Member] [Member] | UNITED KINGDOM |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | $ 41,978 |  | $ 55,727 |  | $ 99,249 |  | $ 108,618 |
Percent of individual segment | 45.00% |  | 50.00% |  | 48.00% |  | 49.00% |
[1] | Represents those projects which generally are completed within three months or less.
[2] | Represents those projects which generally are completed within three months or less.

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