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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, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | $ 2,324,202 |  | $ 1,953,886 |  | $ 4,482,930 |  | $ 3,854,274 |
UNITED STATES |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | 2,211,646 |  | 1,848,379 |  | 4,262,849 |  | 3,641,877 |
United States Electrical Construction And Facilities Services [Member] | UNITED STATES |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | 569,402 |  | 479,542 |  | 1,097,472 |  | 934,294 |
United States Mechanical Construction And Facilities Services [Member] | UNITED STATES |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | 823,086 |  | 723,882 |  | 1,575,495 |  | 1,408,632 |
United States Building Services [Member] | UNITED STATES |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | 523,698 |  | 461,033 |  | 1,035,777 |  | 915,785 |
United States Industrial Services [Member] | UNITED STATES |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | 295,460 |  | 183,922 |  | 554,105 |  | 383,166 |
United Kingdom Building Services [Member] [Member] | UNITED KINGDOM |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | 112,556 |  | 105,507 |  | 220,081 |  | 212,397 |
Operating Segments [Member] | United States Electrical Construction And Facilities Services [Member] | UNITED STATES |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | 570,021 |  | 481,011 |  | 1,098,891 |  | 936,793 |
Operating Segments [Member] | United States Mechanical Construction And Facilities Services [Member] | UNITED STATES |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | 825,365 |  | 726,866 |  | 1,580,642 |  | 1,414,841 |
Intersegment Eliminations [Member] | United States Electrical Construction And Facilities Services [Member] | UNITED STATES |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | (619) |  | (1,469) |  | (1,419) |  | (2,499) |
Intersegment Eliminations [Member] | United States Mechanical Construction And Facilities Services [Member] | UNITED STATES |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | (2,279) |  | (2,984) |  | (5,147) |  | (6,209) |
Commercial Market Sector [Member] | Operating Segments [Member] | United States Electrical Construction And Facilities Services [Member] | UNITED STATES |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | $ 286,290 |  | $ 199,283 |  | $ 555,731 |  | $ 383,665 |
Percent of individual segment | 50.00% |  | 41.00% |  | 51.00% |  | 41.00% |
Commercial Market Sector [Member] | Operating Segments [Member] | United States Mechanical Construction And Facilities Services [Member] | UNITED STATES |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | $ 299,448 |  | $ 262,480 |  | $ 581,310 |  | $ 493,279 |
Percent of individual segment | 36.00% |  | 36.00% |  | 37.00% |  | 35.00% |
Institutional Market Sector [Member] | Operating Segments [Member] | United States Electrical Construction And Facilities Services [Member] | UNITED STATES |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | $ 31,596 |  | $ 31,060 |  | $ 53,941 |  | $ 59,068 |
Percent of individual segment | 5.00% |  | 6.00% |  | 5.00% |  | 6.00% |
Institutional Market Sector [Member] | Operating Segments [Member] | United States Mechanical Construction And Facilities Services [Member] | UNITED STATES |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | $ 76,674 |  | $ 77,499 |  | $ 137,957 |  | $ 142,154 |
Percent of individual segment | 9.00% |  | 11.00% |  | 9.00% |  | 10.00% |
Hospitality Market Sector [Member] | Operating Segments [Member] | United States Electrical Construction And Facilities Services [Member] | UNITED STATES |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | $ 2,846 |  | $ 7,289 |  | $ 9,687 |  | $ 12,805 |
Percent of individual segment | 1.00% |  | 2.00% |  | 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 | $ 8,271 |  | $ 21,191 |  | $ 21,919 |  | $ 47,718 |
Percent of individual segment | 1.00% |  | 3.00% |  | 1.00% |  | 3.00% |
Manufacturing Market Sector [Member] | Operating Segments [Member] | United States Electrical Construction And Facilities Services [Member] | UNITED STATES |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | $ 118,157 |  | $ 94,018 |  | $ 216,960 |  | $ 179,812 |
Percent of individual segment | 21.00% |  | 20.00% |  | 20.00% |  | 19.00% |
Manufacturing Market Sector [Member] | Operating Segments [Member] | United States Mechanical Construction And Facilities Services [Member] | UNITED STATES |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | $ 137,891 |  | $ 89,140 |  | $ 236,654 |  | $ 181,354 |
Percent of individual segment | 17.00% |  | 12.00% |  | 15.00% |  | 13.00% |
Healthcare Market Sector [Member] | Operating Segments [Member] | United States Electrical Construction And Facilities Services [Member] | UNITED STATES |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | $ 21,409 |  | $ 36,679 |  | $ 39,024 |  | $ 75,186 |
Percent of individual segment | 4.00% |  | 8.00% |  | 3.00% |  | 8.00% |
Healthcare Market Sector [Member] | Operating Segments [Member] | United States Mechanical Construction And Facilities Services [Member] | UNITED STATES |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | $ 74,653 |  | $ 59,950 |  | $ 136,027 |  | $ 125,826 |
Percent of individual segment | 9.00% |  | 8.00% |  | 9.00% |  | 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 | $ 51,655 |  | $ 72,511 |  | $ 109,794 |  | $ 143,775 |
Percent of individual segment | 9.00% |  | 15.00% |  | 10.00% |  | 16.00% |
Transportation Market Sector [Member] | Operating Segments [Member] | United States Mechanical Construction And Facilities Services [Member] | UNITED STATES |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | $ 9,291 |  | $ 4,724 |  | $ 15,025 |  | $ 9,930 |
Percent of individual segment | 1.00% |  | 1.00% |  | 1.00% |  | 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 | $ 4,618 |  | $ 6,140 |  | $ 10,633 |  | $ 10,753 |
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 | $ 45,537 |  | $ 42,491 |  | $ 88,748 |  | $ 79,242 |
Percent of individual segment | 6.00% |  | 6.00% |  | 6.00% |  | 5.00% |
Short Duration Projects [Member] | Operating Segments [Member] | United States Electrical Construction And Facilities Services [Member] | UNITED STATES |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | $ 41,447 | [1] | $ 25,195 | [1] | $ 81,856 | [2] | $ 54,725 | [2]
Percent of individual segment | 7.00% |  | 5.00% |  | 7.00% |  | 6.00% |
Short Duration Projects [Member] | Operating Segments [Member] | United States Mechanical Construction And Facilities Services [Member] | UNITED STATES |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | $ 81,168 | [1] | $ 71,090 | [1] | $ 181,104 | [3] | $ 150,812 | [3]
Percent of individual segment | 10.00% |  | 10.00% |  | 11.00% |  | 11.00% |
Service Work [Member] | United Kingdom Building Services [Member] [Member] | UNITED KINGDOM |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | $ 56,829 |  | $ 54,998 |  | $ 111,463 |  | $ 110,273 |
Percent of individual segment | 50.00% |  | 52.00% |  | 51.00% |  | 52.00% |
Service Work [Member] | Operating Segments [Member] | United States Electrical Construction And Facilities Services [Member] | UNITED STATES |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | $ 12,003 |  | $ 8,836 |  | $ 21,265 |  | $ 17,004 |
Percent of individual segment | 2.00% |  | 2.00% |  | 2.00% |  | 2.00% |
Service Work [Member] | Operating Segments [Member] | United States Mechanical Construction And Facilities Services [Member] | UNITED STATES |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | $ 92,432 |  | $ 98,301 |  | $ 181,898 |  | $ 184,526 |
Percent of individual segment | 11.00% |  | 13.00% |  | 11.00% |  | 13.00% |
Commercial Site-Based Services [Member] | United States Building Services [Member] | UNITED STATES |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | $ 130,921 |  | $ 119,043 |  | $ 286,899 |  | $ 265,804 |
Percent of individual segment | 25.00% |  | 26.00% |  | 28.00% |  | 29.00% |
Government Site-Based Services [Member] | United States Building Services [Member] | UNITED STATES |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | $ 42,787 |  | $ 55,147 |  | $ 91,578 |  | $ 110,556 |
Percent of individual segment | 8.00% |  | 12.00% |  | 9.00% |  | 12.00% |
Mechanical Services [Member] | United States Building Services [Member] | UNITED STATES |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | $ 312,822 |  | $ 260,249 |  | $ 586,988 |  | $ 487,591 |
Percent of individual segment | 60.00% |  | 56.00% |  | 56.00% |  | 53.00% |
Energy Services [Member] | United States Building Services [Member] | UNITED STATES |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | $ 37,168 |  | $ 26,594 |  | $ 70,312 |  | $ 51,834 |
Percent of individual segment | 7.00% |  | 6.00% |  | 7.00% |  | 6.00% |
Field Services [Member] | United States Industrial Services [Member] | UNITED STATES |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | $ 252,849 |  | $ 142,302 |  | $ 469,619 |  | $ 304,489 |
Percent of individual segment | 86.00% |  | 77.00% |  | 85.00% |  | 79.00% |
Shop Services [Member] | United States Industrial Services [Member] | UNITED STATES |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | $ 42,611 |  | $ 41,620 |  | $ 84,486 |  | $ 78,677 |
Percent of individual segment | 14.00% |  | 23.00% |  | 15.00% |  | 21.00% |
Projects & Extras [Member] | United Kingdom Building Services [Member] [Member] | UNITED KINGDOM |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | $ 55,727 |  | $ 50,509 |  | $ 108,618 |  | $ 102,124 |
Percent of individual segment | 50.00% |  | 48.00% |  | 49.00% |  | 48.00% |
[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.
[3] | Represents those projects which generally are completed within three months or less.

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