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Revenue from Contracts with Customers - Schedule of Disaggregation of Revenues (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  | $ 2,403,940 | $ 2,287,741 | $ 2,324,202 | $ 2,158,728 | $ 2,229,308 | $ 2,047,049 | $ 1,953,886 | $ 1,900,388 | $ 9,174,611 | $ 8,130,631 | $ 7,686,999
UNITED STATES |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 8,751,352 | 7,715,760 | 7,346,254
United States Electrical Construction And Facilities Services | UNITED STATES |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 2,216,600 | 1,954,323 | 1,829,567
United States Mechanical Construction And Facilities Services | UNITED STATES |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 3,340,337 | 2,962,843 | 2,880,148
United States Building Services | UNITED STATES |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 2,106,872 | 1,875,485 | 1,753,703
United States Industrial Services | UNITED STATES |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 1,087,543 | 923,109 | 882,836
United Kingdom Building Services | UNITED KINGDOM |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 423,259 | 414,871 | $ 340,745
Operating Segments [Member] | United States Electrical Construction And Facilities Services | UNITED STATES |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 2,219,974 | 1,957,819 |
Operating Segments [Member] | United States Mechanical Construction And Facilities Services | UNITED STATES |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 3,351,918 | 2,975,751 |
Intersegment Eliminations [Member] | United States Electrical Construction And Facilities Services | UNITED STATES |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | (3,374) | (3,496) |
Intersegment Eliminations [Member] | United States Mechanical Construction And Facilities Services | UNITED STATES |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | (11,581) | (12,908) |
Commercial Market Sector [Member] | Operating Segments [Member] | United States Electrical Construction And Facilities Services | UNITED STATES |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | $ 1,081,737 | $ 839,045 |
Percent of individual segment |  |  |  |  |  |  |  |  |  | 49.00% | 43.00% |
Commercial Market Sector [Member] | Operating Segments [Member] | United States Mechanical Construction And Facilities Services | UNITED STATES |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | $ 1,185,129 | $ 1,057,542 |
Percent of individual segment |  |  |  |  |  |  |  |  |  | 36.00% | 35.00% |
Institutional Market Sector [Member] | Operating Segments [Member] | United States Electrical Construction And Facilities Services | UNITED STATES |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | $ 125,537 | $ 110,046 |
Percent of individual segment |  |  |  |  |  |  |  |  |  | 6.00% | 6.00% |
Institutional Market Sector [Member] | Operating Segments [Member] | United States Mechanical Construction And Facilities Services | UNITED STATES |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | $ 313,409 | $ 289,882 |
Percent of individual segment |  |  |  |  |  |  |  |  |  | 9.00% | 10.00% |
Hospitality Market Sector [Member] | Operating Segments [Member] | United States Electrical Construction And Facilities Services | UNITED STATES |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | $ 16,985 | $ 32,338 |
Percent of individual segment |  |  |  |  |  |  |  |  |  | 1.00% | 2.00% |
Hospitality Market Sector [Member] | Operating Segments [Member] | United States Mechanical Construction And Facilities Services | UNITED STATES |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | $ 35,385 | $ 93,827 |
Percent of individual segment |  |  |  |  |  |  |  |  |  | 1.00% | 3.00% |
Manufacturing Market Sector [Member] | Operating Segments [Member] | United States Electrical Construction And Facilities Services | UNITED STATES |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | $ 462,953 | $ 388,157 |
Percent of individual segment |  |  |  |  |  |  |  |  |  | 21.00% | 20.00% |
Manufacturing Market Sector [Member] | Operating Segments [Member] | United States Mechanical Construction And Facilities Services | UNITED STATES |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | $ 533,699 | $ 393,637 |
Percent of individual segment |  |  |  |  |  |  |  |  |  | 16.00% | 13.00% |
Healthcare Market Sector [Member] | Operating Segments [Member] | United States Electrical Construction And Facilities Services | UNITED STATES |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | $ 88,752 | $ 126,218 |
Percent of individual segment |  |  |  |  |  |  |  |  |  | 4.00% | 6.00% |
Healthcare Market Sector [Member] | Operating Segments [Member] | United States Mechanical Construction And Facilities Services | UNITED STATES |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | $ 304,622 | $ 240,818 |
Percent of individual segment |  |  |  |  |  |  |  |  |  | 9.00% | 8.00% |
Transportation Market Sector [Member] | Operating Segments [Member] | United States Electrical Construction And Facilities Services | UNITED STATES |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | $ 210,515 | $ 284,464 |
Percent of individual segment |  |  |  |  |  |  |  |  |  | 9.00% | 14.00% |
Transportation Market Sector [Member] | Operating Segments [Member] | United States Mechanical Construction And Facilities Services | UNITED STATES |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | $ 32,686 | $ 19,415 |
Percent of individual segment |  |  |  |  |  |  |  |  |  | 1.00% | 1.00% |
Water and Wastewater Market Sector [Member] | Operating Segments [Member] | United States Electrical Construction And Facilities Services | UNITED STATES |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | $ 19,921 | $ 23,337 |
Percent of individual segment |  |  |  |  |  |  |  |  |  | 1.00% | 1.00% |
Water and Wastewater Market Sector [Member] | Operating Segments [Member] | United States Mechanical Construction And Facilities Services | UNITED STATES |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | $ 202,428 | $ 176,546 |
Percent of individual segment |  |  |  |  |  |  |  |  |  | 6.00% | 6.00% |
Short Duration Projects [Member] | Operating Segments [Member] | United States Electrical Construction And Facilities Services | UNITED STATES |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | $ 158,619 | $ 120,109 |
Percent of individual segment |  |  |  |  |  |  |  |  |  | 7.00% | 6.00% |
Short Duration Projects [Member] | Operating Segments [Member] | United States Mechanical Construction And Facilities Services | UNITED STATES |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues | [1] |  |  |  |  |  |  |  |  | $ 365,721 | $ 318,413 |
Percent of individual segment |  |  |  |  |  |  |  |  |  | 11.00% | 11.00% |
Service Work [Member] | Operating Segments [Member] | United States Electrical Construction And Facilities Services | UNITED STATES |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | $ 54,955 | $ 34,105 |
Percent of individual segment |  |  |  |  |  |  |  |  |  | 2.00% | 2.00% |
Service Work [Member] | Operating Segments [Member] | United States Mechanical Construction And Facilities Services | UNITED STATES |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | $ 378,839 | $ 385,671 |
Percent of individual segment |  |  |  |  |  |  |  |  |  | 11.00% | 13.00% |
Service Work [Member] | Operating Segments [Member] | United Kingdom Building Services | UNITED KINGDOM |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | $ 212,876 | $ 216,880 |
Percent of individual segment |  |  |  |  |  |  |  |  |  | 50.00% | 52.00% |
Commercial Site-Based Services [Member] | Operating Segments [Member] | United States Building Services | UNITED STATES |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | $ 571,345 | $ 519,641 |
Percent of individual segment |  |  |  |  |  |  |  |  |  | 27.00% | 28.00% |
Government Site-Based Services [Member] | Operating Segments [Member] | United States Building Services | UNITED STATES |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | $ 176,282 | $ 213,677 |
Percent of individual segment |  |  |  |  |  |  |  |  |  | 8.00% | 11.00% |
Mechanical Services [Member] | Operating Segments [Member] | United States Building Services | UNITED STATES |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | $ 1,238,420 | $ 1,032,082 |
Percent of individual segment |  |  |  |  |  |  |  |  |  | 59.00% | 55.00% |
Energy Services [Member] | Operating Segments [Member] | United States Building Services | UNITED STATES |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | $ 120,825 | $ 110,085 |
Percent of individual segment |  |  |  |  |  |  |  |  |  | 6.00% | 6.00% |
Field Services [Member] | Operating Segments [Member] | United States Industrial Services | UNITED STATES |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | $ 922,308 | $ 752,458 |
Percent of individual segment |  |  |  |  |  |  |  |  |  | 85.00% | 82.00% |
Shop Services [Member] | Operating Segments [Member] | United States Industrial Services | UNITED STATES |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | $ 165,235 | $ 170,651 |
Percent of individual segment |  |  |  |  |  |  |  |  |  | 15.00% | 18.00% |
Projects & Extras [Member] | Operating Segments [Member] | United Kingdom Building Services | UNITED KINGDOM |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | $ 210,383 | $ 197,991 |
Percent of individual segment |  |  |  |  |  |  |  |  |  | 50.00% | 48.00% |
[1] | Represents those projects which generally are completed within three months or less.

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