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Revenue from Contracts with Customers - Schedule of Disaggregation of Revenues (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | $ 12,582,873 | $ 11,076,120 | $ 9,903,580
UNITED STATES |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | 12,146,450 | 10,599,042 | 9,393,629
United States Electrical Construction And Facilities Services | UNITED STATES |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | 2,783,723 | 2,433,114 | 2,029,893
United States Mechanical Construction And Facilities Services | UNITED STATES |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | 5,074,803 | 4,292,208 | 3,922,200
United States Building Services | UNITED STATES |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | 3,120,134 | 2,754,953 | 2,455,129
United States Industrial Services | UNITED STATES |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | 1,167,790 | 1,118,767 | 986,407
United Kingdom Building Services | UNITED KINGDOM |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | 436,423 | 477,078 | 509,951
Operating Segments [Member] | United States Electrical Construction And Facilities Services | UNITED STATES |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | 2,786,007 | 2,437,304 | 2,033,168
Operating Segments [Member] | United States Mechanical Construction And Facilities Services | UNITED STATES |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | 5,083,903 | 4,303,090 | 3,929,035
Intersegment Eliminations [Member] | United States Electrical Construction And Facilities Services | UNITED STATES |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | (2,284) | (4,190) | (3,275)
Intersegment Eliminations [Member] | United States Mechanical Construction And Facilities Services | UNITED STATES |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | (9,100) | (10,882) | (6,835)
Network and Communications Market Sector | Operating Segments [Member] | United States Electrical Construction And Facilities Services | UNITED STATES |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | $ 934,455 | $ 801,052 | $ 621,139
Percentage of total segment revenues |  | 34.00% | 33.00% | 30.00%
Network and Communications Market Sector | Operating Segments [Member] | United States Mechanical Construction And Facilities Services | UNITED STATES |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | $ 410,397 | $ 295,261 | $ 279,953
Percentage of total segment revenues |  | 8.00% | 7.00% | 7.00%
Commercial Market Sector [Member] | Operating Segments [Member] | United States Electrical Construction And Facilities Services | UNITED STATES |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | $ 402,886 | $ 414,539 | $ 398,996
Percentage of total segment revenues |  | 14.00% | 17.00% | 20.00%
Commercial Market Sector [Member] | Operating Segments [Member] | United States Mechanical Construction And Facilities Services | UNITED STATES |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | $ 1,115,993 | $ 1,079,872 | $ 1,042,751
Percentage of total segment revenues |  | 22.00% | 25.00% | 27.00%
Manufacturing and Industrial Market Sector [Member] | Operating Segments [Member] | United States Electrical Construction And Facilities Services | UNITED STATES |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | $ 394,804 | $ 301,606 | $ 230,894
Percentage of total segment revenues |  | 14.00% | 12.00% | 11.00%
Manufacturing and Industrial Market Sector [Member] | Operating Segments [Member] | United States Mechanical Construction And Facilities Services | UNITED STATES |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | $ 698,993 | $ 632,332 | $ 579,176
Percentage of total segment revenues |  | 14.00% | 15.00% | 15.00%
Healthcare Market Sector [Member] | Operating Segments [Member] | United States Electrical Construction And Facilities Services | UNITED STATES |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | $ 242,931 | $ 178,348 | $ 107,442
Percentage of total segment revenues |  | 9.00% | 7.00% | 5.00%
Healthcare Market Sector [Member] | Operating Segments [Member] | United States Mechanical Construction And Facilities Services | UNITED STATES |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | $ 489,485 | $ 479,937 | $ 487,111
Percentage of total segment revenues |  | 10.00% | 11.00% | 12.00%
High-Tech Manufacturing Market Sector | Operating Segments [Member] | United States Electrical Construction And Facilities Services | UNITED STATES |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | $ 140,471 | $ 88,544 | $ 35,196
Percentage of total segment revenues |  | 5.00% | 4.00% | 2.00%
High-Tech Manufacturing Market Sector | Operating Segments [Member] | United States Mechanical Construction And Facilities Services | UNITED STATES |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | $ 845,251 | $ 320,597 | $ 173,302
Percentage of total segment revenues |  | 16.00% | 7.00% | 4.00%
Institutional Market Sector [Member] | Operating Segments [Member] | United States Electrical Construction And Facilities Services | UNITED STATES |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | $ 147,375 | $ 154,077 | $ 178,729
Percentage of total segment revenues |  | 5.00% | 6.00% | 9.00%
Institutional Market Sector [Member] | Operating Segments [Member] | United States Mechanical Construction And Facilities Services | UNITED STATES |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | $ 316,255 | $ 331,727 | $ 263,285
Percentage of total segment revenues |  | 6.00% | 8.00% | 7.00%
Transportation Market Sector [Member] | Operating Segments [Member] | United States Electrical Construction And Facilities Services | UNITED STATES |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | $ 167,976 | $ 166,563 | $ 196,313
Percentage of total segment revenues |  | 6.00% | 7.00% | 10.00%
Transportation Market Sector [Member] | Operating Segments [Member] | United States Mechanical Construction And Facilities Services | UNITED STATES |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | $ 42,789 | $ 57,026 | $ 84,503
Percentage of total segment revenues |  | 1.00% | 1.00% | 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 |  | $ 21,234 | $ 21,251 | $ 14,962
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 |  | $ 286,912 | $ 261,501 | $ 213,314
Percentage of total segment revenues |  | 6.00% | 6.00% | 5.00%
Hospitality and Entertainment Market Sector [Member] | Operating Segments [Member] | United States Electrical Construction And Facilities Services | UNITED STATES |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | $ 81,815 | $ 33,818 | $ 23,257
Percentage of total segment revenues |  | 3.00% | 1.00% | 1.00%
Hospitality and Entertainment Market Sector [Member] | Operating Segments [Member] | United States Mechanical Construction And Facilities Services | UNITED STATES |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | $ 52,919 | $ 44,615 | $ 66,059
Percentage of total segment revenues |  | 1.00% | 1.00% | 2.00%
Short Duration Projects [Member] | Operating Segments [Member] | United States Electrical Construction And Facilities Services | UNITED STATES |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | [1] | $ 186,722 | $ 211,797 | $ 185,277
Percentage of total segment revenues |  | 7.00% | 9.00% | 9.00%
Short Duration Projects [Member] | Operating Segments [Member] | United States Mechanical Construction And Facilities Services | UNITED STATES |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | [1] | $ 324,056 | $ 333,066 | $ 292,795
Percentage of total segment revenues |  | 6.00% | 8.00% | 8.00%
Service Work [Member] | Operating Segments [Member] | United States Electrical Construction And Facilities Services | UNITED STATES |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | $ 65,338 | $ 65,709 | $ 40,963
Percentage of total segment revenues |  | 2.00% | 3.00% | 2.00%
Service Work [Member] | Operating Segments [Member] | United States Mechanical Construction And Facilities Services | UNITED STATES |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | $ 500,853 | $ 467,156 | $ 446,786
Percentage of total segment revenues |  | 10.00% | 11.00% | 11.00%
Service Work [Member] | Operating Segments [Member] | United Kingdom Building Services | UNITED KINGDOM |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | $ 210,414 | $ 221,123 | $ 261,889
Percentage of total segment revenues |  | 48.00% | 46.00% | 51.00%
Mechanical Services [Member] | Operating Segments [Member] | United States Building Services | UNITED STATES |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | $ 2,042,244 | $ 1,748,455 | $ 1,590,506
Percentage of total segment revenues |  | 65.00% | 64.00% | 65.00%
Commercial Site-Based Services [Member] | Operating Segments [Member] | United States Building Services | UNITED STATES |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | $ 865,232 | $ 810,210 | $ 680,351
Percentage of total segment revenues |  | 28.00% | 29.00% | 28.00%
Government Site-Based Services [Member] | Operating Segments [Member] | United States Building Services | UNITED STATES |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | $ 212,658 | $ 196,288 | $ 184,272
Percentage of total segment revenues |  | 7.00% | 7.00% | 7.00%
Field Services [Member] | Operating Segments [Member] | United States Industrial Services | UNITED STATES |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | $ 991,466 | $ 972,894 | $ 853,143
Percentage of total segment revenues |  | 85.00% | 87.00% | 86.00%
Shop Services [Member] | Operating Segments [Member] | United States Industrial Services | UNITED STATES |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | $ 176,324 | $ 145,873 | $ 133,264
Percentage of total segment revenues |  | 15.00% | 13.00% | 14.00%
Project Work [Member] | Operating Segments [Member] | United Kingdom Building Services | UNITED KINGDOM |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | $ 226,009 | $ 255,955 | $ 248,062
Percentage of total segment revenues |  | 52.00% | 54.00% | 49.00%
[1] | Represents those projects which generally are completed within three months or less.

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