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Revenue from Contracts with Customers - Schedule of Disaggregation of Revenues (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | $ 2,287,741 |  | $ 2,047,049 |  | $ 6,770,671 |  | $ 5,901,323 |
UNITED STATES |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | 2,190,113 |  | 1,946,483 |  | 6,452,962 |  | 5,588,360 |
United States Electrical Construction And Facilities Services [Member] | UNITED STATES |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | 554,637 |  | 485,974 |  | 1,652,109 |  | 1,420,268 |
United States Mechanical Construction And Facilities Services [Member] | UNITED STATES |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | 869,188 |  | 759,495 |  | 2,444,683 |  | 2,168,127 |
United States Building Services [Member] | UNITED STATES |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | 532,122 |  | 473,701 |  | 1,567,899 |  | 1,389,486 |
United States Industrial Services [Member] | UNITED STATES |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | 234,166 |  | 227,313 |  | 788,271 |  | 610,479 |
United Kingdom Building Services [Member] [Member] | UNITED KINGDOM |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | 97,628 |  | 100,566 |  | 317,709 |  | 312,963 |
Operating Segments [Member] | United States Electrical Construction And Facilities Services [Member] | UNITED STATES |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | 555,928 |  | 486,349 |  | 1,654,819 |  | 1,423,142 |
Operating Segments [Member] | United States Mechanical Construction And Facilities Services [Member] | UNITED STATES |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | 872,178 |  | 762,479 |  | 2,452,820 |  | 2,177,320 |
Intersegment Eliminations [Member] | United States Electrical Construction And Facilities Services [Member] | UNITED STATES |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | (1,291) |  | (375) |  | (2,710) |  | (2,874) |
Intersegment Eliminations [Member] | United States Mechanical Construction And Facilities Services [Member] | UNITED STATES |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | (2,990) |  | (2,984) |  | (8,137) |  | (9,193) |
Commercial Market Sector [Member] | Operating Segments [Member] | United States Electrical Construction And Facilities Services [Member] | UNITED STATES |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | $ 260,871 |  | $ 196,293 |  | $ 816,602 |  | $ 579,958 |
Percent of individual segment | 47.00% |  | 40.00% |  | 49.00% |  | 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 | $ 293,202 |  | $ 287,350 |  | $ 874,512 |  | $ 780,629 |
Percent of individual segment | 33.00% |  | 38.00% |  | 36.00% |  | 36.00% |
Institutional Market Sector [Member] | Operating Segments [Member] | United States Electrical Construction And Facilities Services [Member] | UNITED STATES |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | $ 33,702 |  | $ 27,903 |  | $ 87,643 |  | $ 86,971 |
Percent of individual segment | 6.00% |  | 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 | $ 94,886 |  | $ 77,676 |  | $ 232,843 |  | $ 219,830 |
Percent of individual segment | 11.00% |  | 10.00% |  | 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 | $ 2,243 |  | $ 9,860 |  | $ 11,930 |  | $ 22,665 |
Percent of individual segment | 1.00% |  | 2.00% |  | 1.00% |  | 2.00% |
Hospitality Market Sector [Member] | Operating Segments [Member] | United States Mechanical Construction And Facilities Services [Member] | UNITED STATES |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | $ 6,888 |  | $ 26,170 |  | $ 28,807 |  | $ 73,888 |
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 | $ 121,488 |  | $ 100,563 |  | $ 338,448 |  | $ 280,375 |
Percent of individual segment | 22.00% |  | 20.00% |  | 20.00% |  | 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 | $ 150,199 |  | $ 89,779 |  | $ 386,853 |  | $ 271,133 |
Percent of individual segment | 17.00% |  | 12.00% |  | 16.00% |  | 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 | $ 24,701 |  | $ 28,121 |  | $ 63,725 |  | $ 103,307 |
Percent of individual segment | 4.00% |  | 6.00% |  | 4.00% |  | 7.00% |
Healthcare Market Sector [Member] | Operating Segments [Member] | United States Mechanical Construction And Facilities Services [Member] | UNITED STATES |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | $ 84,418 |  | $ 55,843 |  | $ 220,445 |  | $ 181,669 |
Percent of individual segment | 10.00% |  | 7.00% |  | 9.00% |  | 8.00% |
Transportation Market Sector [Member] | Operating Segments [Member] | United States Electrical Construction And Facilities Services [Member] | UNITED STATES |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | $ 52,744 |  | $ 72,816 |  | $ 162,538 |  | $ 216,591 |
Percent of individual segment | 9.00% |  | 15.00% |  | 10.00% |  | 15.00% |
Transportation Market Sector [Member] | Operating Segments [Member] | United States Mechanical Construction And Facilities Services [Member] | UNITED STATES |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | $ 7,855 |  | $ 3,072 |  | $ 22,880 |  | $ 13,002 |
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 | $ 3,709 |  | $ 4,194 |  | $ 14,342 |  | $ 14,947 |
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 | $ 42,637 |  | $ 43,033 |  | $ 131,385 |  | $ 122,275 |
Percent of individual segment | 5.00% |  | 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 | $ 42,296 | [1] | $ 38,452 | [1] | $ 124,152 | [2] | $ 93,177 | [2]
Percent of individual segment | 7.00% |  | 8.00% |  | 8.00% |  | 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 | $ 91,897 | [1] | $ 72,388 | [1] | $ 273,001 | [3] | $ 223,200 | [3]
Percent of individual segment | 10.00% |  | 9.00% |  | 11.00% |  | 10.00% |
Service Work [Member] | United Kingdom Building Services [Member] [Member] | UNITED KINGDOM |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | $ 49,098 |  | $ 51,815 |  | $ 160,561 |  | $ 162,088 |
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 | $ 14,174 |  | $ 8,147 |  | $ 35,439 |  | $ 25,151 |
Percent of individual segment | 3.00% |  | 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 | $ 100,196 |  | $ 107,168 |  | $ 282,094 |  | $ 291,694 |
Percent of individual segment | 12.00% |  | 14.00% |  | 12.00% |  | 13.00% |
Commercial Site-Based Services [Member] | United States Building Services [Member] | UNITED STATES |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | $ 133,179 |  | $ 120,917 |  | $ 420,078 |  | $ 386,721 |
Percent of individual segment | 25.00% |  | 26.00% |  | 27.00% |  | 28.00% |
Government Site-Based Services [Member] | United States Building Services [Member] | UNITED STATES |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | $ 42,412 |  | $ 52,332 |  | $ 133,990 |  | $ 162,888 |
Percent of individual segment | 8.00% |  | 11.00% |  | 8.00% |  | 12.00% |
Mechanical Services [Member] | United States Building Services [Member] | UNITED STATES |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | $ 333,696 |  | $ 276,722 |  | $ 920,684 |  | $ 764,313 |
Percent of individual segment | 63.00% |  | 58.00% |  | 59.00% |  | 55.00% |
Energy Services [Member] | United States Building Services [Member] | UNITED STATES |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | $ 22,835 |  | $ 23,730 |  | $ 93,147 |  | $ 75,564 |
Percent of individual segment | 4.00% |  | 5.00% |  | 6.00% |  | 5.00% |
Field Services [Member] | United States Industrial Services [Member] | UNITED STATES |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | $ 194,569 |  | $ 181,873 |  | $ 664,188 |  | $ 486,362 |
Percent of individual segment | 83.00% |  | 80.00% |  | 84.00% |  | 80.00% |
Shop Services [Member] | United States Industrial Services [Member] | UNITED STATES |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | $ 39,597 |  | $ 45,440 |  | $ 124,083 |  | $ 124,117 |
Percent of individual segment | 17.00% |  | 20.00% |  | 16.00% |  | 20.00% |
Projects & Extras [Member] | United Kingdom Building Services [Member] [Member] | UNITED KINGDOM |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | $ 48,530 |  | $ 48,751 |  | $ 157,148 |  | $ 150,875 |
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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