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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, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  | $ 2,229,308 | $ 2,047,049 | $ 1,953,886 | $ 1,900,388 | $ 2,012,639 | $ 1,886,691 | $ 1,895,937 | $ 1,891,732 | $ 8,130,631 | $ 7,686,999 | $ 7,551,524
UNITED STATES |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 7,715,760 | 7,346,254 | 7,225,268
United States Electrical Construction And Facilities Services | UNITED STATES |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 1,954,323 | 1,829,567 | 1,704,403
United States Mechanical Construction And Facilities Services | UNITED STATES |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 3,020,307 | 2,963,815 | 2,643,321
United States Building Services | UNITED STATES |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 1,875,485 | 1,753,703 | 1,810,229
United States Industrial Services | UNITED STATES |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 865,645 | 799,169 | 1,067,315
United Kingdom Building Services | UNITED KINGDOM |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 414,871 | $ 340,745 | $ 326,256
Operating Segments [Member] | United States Electrical Construction And Facilities Services | UNITED STATES |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 1,957,819 |  |
Operating Segments [Member] | United States Mechanical Construction And Facilities Services | UNITED STATES |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 3,038,665 |  |
Intersegment Eliminations [Member] | United States Electrical Construction And Facilities Services | UNITED STATES |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | (3,496) |  |
Intersegment Eliminations [Member] | United States Mechanical Construction And Facilities Services | UNITED STATES |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | (18,358) |  |
Commercial Market Sector [Member] | Operating Segments [Member] | United States Electrical Construction And Facilities Services | UNITED STATES |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | $ 839,045 |  |
Percent of individual segment |  |  |  |  |  |  |  |  |  | 43.00% |  |
Commercial Market Sector [Member] | Operating Segments [Member] | United States Mechanical Construction And Facilities Services | UNITED STATES |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | $ 1,063,571 |  |
Percent of individual segment |  |  |  |  |  |  |  |  |  | 35.00% |  |
Institutional Market Sector [Member] | Operating Segments [Member] | United States Electrical Construction And Facilities Services | UNITED STATES |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | $ 110,046 |  |
Percent of individual segment |  |  |  |  |  |  |  |  |  | 6.00% |  |
Institutional Market Sector [Member] | Operating Segments [Member] | United States Mechanical Construction And Facilities Services | UNITED STATES |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | $ 292,255 |  |
Percent of individual segment |  |  |  |  |  |  |  |  |  | 9.00% |  |
Hospitality Market Sector [Member] | Operating Segments [Member] | United States Electrical Construction And Facilities Services | UNITED STATES |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | $ 32,338 |  |
Percent of individual segment |  |  |  |  |  |  |  |  |  | 2.00% |  |
Hospitality Market Sector [Member] | Operating Segments [Member] | United States Mechanical Construction And Facilities Services | UNITED STATES |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | $ 93,827 |  |
Percent of individual segment |  |  |  |  |  |  |  |  |  | 3.00% |  |
Manufacturing Market Sector [Member] | Operating Segments [Member] | United States Electrical Construction And Facilities Services | UNITED STATES |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | $ 388,157 |  |
Percent of individual segment |  |  |  |  |  |  |  |  |  | 20.00% |  |
Manufacturing Market Sector [Member] | Operating Segments [Member] | United States Mechanical Construction And Facilities Services | UNITED STATES |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | $ 430,286 |  |
Percent of individual segment |  |  |  |  |  |  |  |  |  | 14.00% |  |
Healthcare Market Sector [Member] | Operating Segments [Member] | United States Electrical Construction And Facilities Services | UNITED STATES |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | $ 126,218 |  |
Percent of individual segment |  |  |  |  |  |  |  |  |  | 6.00% |  |
Healthcare Market Sector [Member] | Operating Segments [Member] | United States Mechanical Construction And Facilities Services | UNITED STATES |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | $ 241,113 |  |
Percent of individual segment |  |  |  |  |  |  |  |  |  | 8.00% |  |
Transportation Market Sector [Member] | Operating Segments [Member] | United States Electrical Construction And Facilities Services | UNITED STATES |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | $ 284,464 |  |
Percent of individual segment |  |  |  |  |  |  |  |  |  | 14.00% |  |
Transportation Market Sector [Member] | Operating Segments [Member] | United States Mechanical Construction And Facilities Services | UNITED STATES |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | $ 19,415 |  |
Percent of individual segment |  |  |  |  |  |  |  |  |  | 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 |  |  |  |  |  |  |  |  |  | $ 23,337 |  |
Percent of individual segment |  |  |  |  |  |  |  |  |  | 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 |  |  |  |  |  |  |  |  |  | $ 176,574 |  |
Percent of individual segment |  |  |  |  |  |  |  |  |  | 6.00% |  |
Short Duration Projects [Member] | Operating Segments [Member] | United States Electrical Construction And Facilities Services | UNITED STATES |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | $ 120,109 |  |
Percent of individual segment |  |  |  |  |  |  |  |  |  | 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] |  |  |  |  |  |  |  |  | $ 335,953 |  |
Percent of individual segment |  |  |  |  |  |  |  |  |  | 11.00% |  |
Service Work [Member] | Operating Segments [Member] | United States Electrical Construction And Facilities Services | UNITED STATES |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | $ 34,105 |  |
Percent of individual segment |  |  |  |  |  |  |  |  |  | 2.00% |  |
Service Work [Member] | Operating Segments [Member] | United States Mechanical Construction And Facilities Services | UNITED STATES |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | $ 385,671 |  |
Percent of individual segment |  |  |  |  |  |  |  |  |  | 13.00% |  |
Service Work [Member] | Operating Segments [Member] | United Kingdom Building Services | UNITED KINGDOM |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | $ 216,880 |  |
Percent of individual segment |  |  |  |  |  |  |  |  |  | 52.00% |  |
Commercial Site-Based Services [Member] | Operating Segments [Member] | United States Building Services | UNITED STATES |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | $ 519,641 |  |
Percent of individual segment |  |  |  |  |  |  |  |  |  | 28.00% |  |
Government Site-Based Services [Member] | Operating Segments [Member] | United States Building Services | UNITED STATES |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | $ 213,677 |  |
Percent of individual segment |  |  |  |  |  |  |  |  |  | 11.00% |  |
Mechanical Services [Member] | Operating Segments [Member] | United States Building Services | UNITED STATES |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | $ 1,032,082 |  |
Percent of individual segment |  |  |  |  |  |  |  |  |  | 55.00% |  |
Energy Services [Member] | Operating Segments [Member] | United States Building Services | UNITED STATES |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | $ 110,085 |  |
Percent of individual segment |  |  |  |  |  |  |  |  |  | 6.00% |  |
Field Services [Member] | Operating Segments [Member] | United States Industrial Services | UNITED STATES |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | $ 694,994 |  |
Percent of individual segment |  |  |  |  |  |  |  |  |  | 80.00% |  |
Shop Services [Member] | Operating Segments [Member] | United States Industrial Services | UNITED STATES |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | $ 170,651 |  |
Percent of individual segment |  |  |  |  |  |  |  |  |  | 20.00% |  |
Projects & Extras [Member] | Operating Segments [Member] | United Kingdom Building Services | UNITED KINGDOM |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | $ 197,991 |  |
Percent of individual segment |  |  |  |  |  |  |  |  |  | 48.00% |  |
[1] | Represents those projects which generally are completed within three months or less.

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