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Revenue from Contracts with Customers - Schedule of Disaggregation of Revenues (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | $ 11,076,120 | $ 9,903,580 | $ 8,797,061
UNITED STATES |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | 10,599,042 | 9,393,629 | 8,366,498
United States Electrical Construction And Facilities Services | UNITED STATES |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | 2,433,114 | 2,029,893 | 1,829,979
United States Mechanical Construction And Facilities Services | UNITED STATES |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | 4,326,674 | 3,952,586 | 3,516,789
United States Building Services | UNITED STATES |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | 2,720,487 | 2,424,743 | 2,078,835
United States Industrial Services | UNITED STATES |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | 1,118,767 | 986,407 | 940,895
United Kingdom Building Services | UNITED KINGDOM |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | 477,078 | 509,951 | 430,563
Operating Segments [Member] | United States Electrical Construction And Facilities Services | UNITED STATES |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | 2,437,304 | 2,033,168 | 1,835,017
Operating Segments [Member] | United States Mechanical Construction And Facilities Services | UNITED STATES |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | 4,337,556 | 3,959,421 | 3,523,875
Intersegment Eliminations [Member] | United States Electrical Construction And Facilities Services | UNITED STATES |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | (4,190) | (3,275) | (5,038)
Intersegment Eliminations [Member] | United States Mechanical Construction And Facilities Services | UNITED STATES |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | (10,882) | (6,835) | (7,086)
Commercial Market Sector [Member] | Operating Segments [Member] | United States Electrical Construction And Facilities Services | UNITED STATES |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | $ 1,320,392 | $ 1,063,242 | $ 970,576
Percentage of total segment revenues |  | 54.00% | 52.00% | 53.00%
Commercial Market Sector [Member] | Operating Segments [Member] | United States Mechanical Construction And Facilities Services | UNITED STATES |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | $ 1,711,772 | $ 1,524,685 | $ 1,315,973
Percentage of total segment revenues |  | 39.00% | 39.00% | 37.00%
Manufacturing Market Sector [Member] | Operating Segments [Member] | United States Electrical Construction And Facilities Services | UNITED STATES |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | $ 301,606 | $ 230,894 | $ 241,415
Percentage of total segment revenues |  | 12.00% | 11.00% | 13.00%
Manufacturing Market Sector [Member] | Operating Segments [Member] | United States Mechanical Construction And Facilities Services | UNITED STATES |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | $ 632,332 | $ 579,176 | $ 486,753
Percentage of total segment revenues |  | 15.00% | 15.00% | 14.00%
Healthcare Market Sector [Member] | Operating Segments [Member] | United States Electrical Construction And Facilities Services | UNITED STATES |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | $ 178,348 | $ 107,442 | $ 79,275
Percentage of total segment revenues |  | 7.00% | 5.00% | 4.00%
Healthcare Market Sector [Member] | Operating Segments [Member] | United States Mechanical Construction And Facilities Services | UNITED STATES |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | $ 480,954 | $ 488,910 | $ 346,315
Percentage of total segment revenues |  | 11.00% | 12.00% | 10.00%
Institutional Market Sector [Member] | Operating Segments [Member] | United States Electrical Construction And Facilities Services | UNITED STATES |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | $ 154,077 | $ 178,729 | $ 146,759
Percentage of total segment revenues |  | 6.00% | 9.00% | 8.00%
Institutional Market Sector [Member] | Operating Segments [Member] | United States Mechanical Construction And Facilities Services | UNITED STATES |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | $ 353,611 | $ 280,463 | $ 377,738
Percentage of total segment revenues |  | 8.00% | 7.00% | 11.00%
Transportation Market Sector [Member] | Operating Segments [Member] | United States Electrical Construction And Facilities Services | UNITED STATES |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | $ 166,563 | $ 196,313 | $ 192,656
Percentage of total segment revenues |  | 7.00% | 10.00% | 10.00%
Transportation Market Sector [Member] | Operating Segments [Member] | United States Mechanical Construction And Facilities Services | UNITED STATES |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | $ 57,026 | $ 84,503 | $ 70,692
Percentage of total segment revenues |  | 1.00% | 2.00% | 2.00%
Water and Wastewater Market Sector [Member] | Operating Segments [Member] | United States Electrical Construction And Facilities Services | UNITED STATES |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | $ 21,251 | $ 14,962 | $ 6,882
Percentage of total segment revenues |  | 1.00% | 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 |  | $ 261,500 | $ 213,315 | $ 185,996
Percentage of total segment revenues |  | 6.00% | 5.00% | 5.00%
Hospitality Market Sector [Member] | Operating Segments [Member] | United States Electrical Construction And Facilities Services | UNITED STATES |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | $ 17,563 | $ 15,346 | $ 23,797
Percentage of total segment revenues |  | 1.00% | 1.00% | 1.00%
Hospitality Market Sector [Member] | Operating Segments [Member] | United States Mechanical Construction And Facilities Services | UNITED STATES |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | $ 29,511 | $ 38,405 | $ 40,079
Percentage of total segment revenues |  | 1.00% | 1.00% | 1.00%
Short Duration Projects [Member] | Operating Segments [Member] | United States Electrical Construction And Facilities Services | UNITED STATES |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | [1] | $ 211,795 | $ 185,277 | $ 145,370
Percentage of total segment revenues |  | 9.00% | 9.00% | 8.00%
Short Duration Projects [Member] | Operating Segments [Member] | United States Mechanical Construction And Facilities Services | UNITED STATES |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | [1] | $ 337,522 | $ 297,673 | $ 335,262
Percentage of total segment revenues |  | 8.00% | 8.00% | 10.00%
Service Work [Member] | Operating Segments [Member] | United States Electrical Construction And Facilities Services | UNITED STATES |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | $ 65,709 | $ 40,963 | $ 28,287
Percentage of total segment revenues |  | 3.00% | 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 |  | $ 473,328 | $ 452,291 | $ 365,067
Percentage of total segment revenues |  | 11.00% | 11.00% | 10.00%
Service Work [Member] | Operating Segments [Member] | United Kingdom Building Services | UNITED KINGDOM |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | $ 221,123 | $ 261,889 | $ 221,373
Percentage of total segment revenues |  | 46.00% | 51.00% | 51.00%
Mobile Mechanical Services [Member] | Operating Segments [Member] | United States Building Services | UNITED STATES |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | $ 1,713,989 | $ 1,560,120 | $ 1,323,499
Percentage of total segment revenues |  | 63.00% | 64.00% | 64.00%
Commercial Site-Based Services [Member] | Operating Segments [Member] | United States Building Services | UNITED STATES |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | $ 810,210 | $ 680,351 | $ 587,346
Percentage of total segment revenues |  | 30.00% | 28.00% | 28.00%
Government Site-Based Services [Member] | Operating Segments [Member] | United States Building Services | UNITED STATES |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | $ 196,288 | $ 184,272 | $ 167,990
Percentage of total segment revenues |  | 7.00% | 8.00% | 8.00%
Field Services [Member] | Operating Segments [Member] | United States Industrial Services | UNITED STATES |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | $ 972,894 | $ 853,143 | $ 813,872
Percentage of total segment revenues |  | 87.00% | 86.00% | 86.00%
Shop Services [Member] | Operating Segments [Member] | United States Industrial Services | UNITED STATES |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | $ 145,873 | $ 133,264 | $ 127,023
Percentage of total segment revenues |  | 13.00% | 14.00% | 14.00%
Project Work [Member] | Operating Segments [Member] | United Kingdom Building Services | UNITED KINGDOM |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | $ 255,955 | $ 248,062 | $ 209,190
Percentage of total segment revenues |  | 54.00% | 49.00% | 49.00%
[1] | Represents those projects which generally are completed within three months or less.

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