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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, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | $ 2,201,714 |  | $ 2,287,741 |  | $ 6,515,567 |  | $ 6,770,671 |
UNITED STATES |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | 2,091,639 |  | 2,190,113 |  | 6,199,998 |  | 6,452,962 |
United States Electrical Construction And Facilities Services [Member] | UNITED STATES |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | 508,863 |  | 554,637 |  | 1,479,973 |  | 1,652,109 |
United States Mechanical Construction And Facilities Services [Member] | UNITED STATES |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | 891,509 |  | 869,188 |  | 2,516,062 |  | 2,444,683 |
United States Building Services [Member] | UNITED STATES |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | 551,555 |  | 532,122 |  | 1,542,054 |  | 1,567,899 |
United States Industrial Services [Member] | UNITED STATES |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | 139,712 |  | 234,166 |  | 661,909 |  | 788,271 |
United Kingdom Building Services [Member] [Member] | UNITED KINGDOM |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | 110,075 |  | 97,628 |  | 315,569 |  | 317,709 |
Operating Segments [Member] | United States Electrical Construction And Facilities Services [Member] | UNITED STATES |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | 510,679 |  | 555,928 |  | 1,483,380 |  | 1,654,819 |
Operating Segments [Member] | United States Mechanical Construction And Facilities Services [Member] | UNITED STATES |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | 893,667 |  | 872,178 |  | 2,521,074 |  | 2,452,820 |
Intersegment Eliminations [Member] | United States Electrical Construction And Facilities Services [Member] | UNITED STATES |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | (1,816) |  | (1,291) |  | (3,407) |  | (2,710) |
Intersegment Eliminations [Member] | United States Mechanical Construction And Facilities Services [Member] | UNITED STATES |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | (2,158) |  | (2,990) |  | (5,012) |  | (8,137) |
Commercial Market Sector [Member] | Operating Segments [Member] | United States Electrical Construction And Facilities Services [Member] | UNITED STATES |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | $ 253,436 |  | $ 260,871 |  | $ 711,562 |  | $ 816,602 |
Percent of individual segment | 50.00% |  | 47.00% |  | 48.00% |  | 49.00% |
Commercial Market Sector [Member] | Operating Segments [Member] | United States Mechanical Construction And Facilities Services [Member] | UNITED STATES |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | $ 346,911 |  | $ 293,202 |  | $ 925,035 |  | $ 874,512 |
Percent of individual segment | 39.00% |  | 33.00% |  | 37.00% |  | 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 | $ 38,135 |  | $ 33,702 |  | $ 113,994 |  | $ 87,643 |
Percent of individual segment | 7.00% |  | 6.00% |  | 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 | $ 112,264 |  | $ 94,886 |  | $ 289,090 |  | $ 232,843 |
Percent of individual segment | 13.00% |  | 11.00% |  | 12.00% |  | 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 | $ 7,028 |  | $ 2,243 |  | $ 17,009 |  | $ 11,930 |
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 | $ 12,570 |  | $ 6,888 |  | $ 29,382 |  | $ 28,807 |
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 | $ 92,789 |  | $ 121,488 |  | $ 297,414 |  | $ 338,448 |
Percent of individual segment | 18.00% |  | 22.00% |  | 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 | $ 93,919 |  | $ 150,199 |  | $ 310,109 |  | $ 386,853 |
Percent of individual segment | 11.00% |  | 17.00% |  | 12.00% |  | 16.00% |
Healthcare Market Sector [Member] | Operating Segments [Member] | United States Electrical Construction And Facilities Services [Member] | UNITED STATES |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | $ 18,876 |  | $ 24,701 |  | $ 57,218 |  | $ 63,725 |
Percent of individual segment | 4.00% |  | 4.00% |  | 4.00% |  | 4.00% |
Healthcare Market Sector [Member] | Operating Segments [Member] | United States Mechanical Construction And Facilities Services [Member] | UNITED STATES |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | $ 78,814 |  | $ 84,418 |  | $ 247,401 |  | $ 220,445 |
Percent of individual segment | 9.00% |  | 10.00% |  | 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 | $ 58,765 |  | $ 52,744 |  | $ 150,911 |  | $ 162,538 |
Percent of individual segment | 12.00% |  | 9.00% |  | 10.00% |  | 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 | $ 19,824 |  | $ 7,855 |  | $ 53,839 |  | $ 22,880 |
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 | $ 2,351 |  | $ 3,709 |  | $ 6,587 |  | $ 14,342 |
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 | $ 45,255 |  | $ 42,637 |  | $ 131,374 |  | $ 131,385 |
Percent of individual segment | 5.00% |  | 5.00% |  | 5.00% |  | 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 | $ 27,321 | [1] | $ 42,296 | [1] | $ 90,218 | [2] | $ 124,152 | [2]
Percent of individual segment | 5.00% |  | 7.00% |  | 6.00% |  | 8.00% |
Short Duration Projects [Member] | Operating Segments [Member] | United States Mechanical Construction And Facilities Services [Member] | UNITED STATES |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | $ 84,461 | [1] | $ 91,897 | [1] | $ 255,618 | [2] | $ 273,001 | [2]
Percent of individual segment | 9.00% |  | 10.00% |  | 10.00% |  | 11.00% |
Service Work [Member] | United Kingdom Building Services [Member] [Member] | UNITED KINGDOM |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | $ 55,594 |  | $ 49,098 |  | $ 161,839 |  | $ 160,561 |
Percent of individual segment | 51.00% |  | 50.00% |  | 51.00% |  | 51.00% |
Service Work [Member] | Operating Segments [Member] | United States Electrical Construction And Facilities Services [Member] | UNITED STATES |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | $ 11,978 |  | $ 14,174 |  | $ 38,467 |  | $ 35,439 |
Percent of individual segment | 2.00% |  | 3.00% |  | 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 | $ 99,649 |  | $ 100,196 |  | $ 279,226 |  | $ 282,094 |
Percent of individual segment | 11.00% |  | 12.00% |  | 11.00% |  | 12.00% |
Commercial Site-Based Services [Member] | United States Building Services [Member] | UNITED STATES |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | $ 147,768 |  | $ 133,179 |  | $ 423,284 |  | $ 420,078 |
Percent of individual segment | 27.00% |  | 25.00% |  | 27.00% |  | 27.00% |
Government Site-Based Services [Member] | United States Building Services [Member] | UNITED STATES |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | $ 44,664 |  | $ 42,412 |  | $ 126,000 |  | $ 133,990 |
Percent of individual segment | 8.00% |  | 8.00% |  | 8.00% |  | 8.00% |
Mobile Mechanical Services [Member] | United States Building Services [Member] | UNITED STATES |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | $ 336,320 |  | $ 333,696 |  | $ 922,676 |  | $ 920,684 |
Percent of individual segment | 61.00% |  | 63.00% |  | 60.00% |  | 59.00% |
Energy Services [Member] | United States Building Services [Member] | UNITED STATES |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | $ 22,803 |  | $ 22,835 |  | $ 70,094 |  | $ 93,147 |
Percent of individual segment | 4.00% |  | 4.00% |  | 5.00% |  | 6.00% |
Field Services [Member] | United States Industrial Services [Member] | UNITED STATES |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | $ 113,345 |  | $ 194,569 |  | $ 560,462 |  | $ 664,188 |
Percent of individual segment | 81.00% |  | 83.00% |  | 85.00% |  | 84.00% |
Shop Services [Member] | United States Industrial Services [Member] | UNITED STATES |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | $ 26,367 |  | $ 39,597 |  | $ 101,447 |  | $ 124,083 |
Percent of individual segment | 19.00% |  | 17.00% |  | 15.00% |  | 16.00% |
Project Work [Member] | United Kingdom Building Services [Member] [Member] | UNITED KINGDOM |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenues | $ 54,481 |  | $ 48,530 |  | $ 153,730 |  | $ 157,148 |
Percent of individual segment | 49.00% |  | 50.00% |  | 49.00% |  | 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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