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Revenue from Contracts with Customers - Schedule of Disaggregation of Revenues (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | $ 9,903,580 | $ 8,797,061 | $ 9,174,611
UNITED STATES |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | 9,393,629 | 8,366,498 | 8,751,352
United States Electrical Construction And Facilities Services | UNITED STATES |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | 2,015,466 | 1,806,092 | 1,961,798
United States Mechanical Construction And Facilities Services | UNITED STATES |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | 3,922,864 | 3,485,495 | 3,340,337
United States Building Services | UNITED STATES |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | 2,468,892 | 2,134,016 | 2,121,661
United States Industrial Services | UNITED STATES |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | 986,407 | 940,895 | 1,327,556
United Kingdom Building Services | UNITED KINGDOM |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | 509,951 | 430,563 | 423,259
Operating Segments [Member] | United States Electrical Construction And Facilities Services | UNITED STATES |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | 2,018,706 | 1,811,217 | 1,965,026
Operating Segments [Member] | United States Mechanical Construction And Facilities Services | UNITED STATES |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | 3,930,753 | 3,492,013 | 3,351,918
Intersegment Eliminations [Member] | United States Electrical Construction And Facilities Services | UNITED STATES |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | (3,240) | (5,125) | (3,228)
Intersegment Eliminations [Member] | United States Mechanical Construction And Facilities Services | UNITED STATES |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | (7,889) | (6,518) | (11,581)
Commercial Market Sector [Member] | Operating Segments [Member] | United States Electrical Construction And Facilities Services | UNITED STATES |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | $ 1,059,908 | $ 963,452 | $ 1,078,200
Percent of individual segment |  | 52.00% | 53.00% | 55.00%
Commercial Market Sector [Member] | Operating Segments [Member] | United States Mechanical Construction And Facilities Services | UNITED STATES |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | $ 1,525,816 | $ 1,316,013 | $ 1,185,129
Percent of individual segment |  | 39.00% | 38.00% | 36.00%
Manufacturing Market Sector [Member] | Operating Segments [Member] | United States Electrical Construction And Facilities Services | UNITED STATES |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | $ 226,644 | $ 241,415 | $ 224,913
Percent of individual segment |  | 11.00% | 13.00% | 11.00%
Manufacturing Market Sector [Member] | Operating Segments [Member] | United States Mechanical Construction And Facilities Services | UNITED STATES |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | $ 523,896 | $ 430,365 | $ 533,699
Percent of individual segment |  | 13.00% | 12.00% | 16.00%
Healthcare Market Sector [Member] | Operating Segments [Member] | United States Electrical Construction And Facilities Services | UNITED STATES |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | $ 106,412 | $ 72,778 | $ 85,088
Percent of individual segment |  | 5.00% | 4.00% | 4.00%
Healthcare Market Sector [Member] | Operating Segments [Member] | United States Mechanical Construction And Facilities Services | UNITED STATES |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | $ 489,028 | $ 349,235 | $ 304,622
Percent of individual segment |  | 12.00% | 10.00% | 9.00%
Institutional Market Sector [Member] | Operating Segments [Member] | United States Electrical Construction And Facilities Services | UNITED STATES |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | $ 177,312 | $ 140,837 | $ 120,991
Percent of individual segment |  | 9.00% | 8.00% | 6.00%
Institutional Market Sector [Member] | Operating Segments [Member] | United States Mechanical Construction And Facilities Services | UNITED STATES |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | $ 280,463 | $ 377,780 | $ 313,409
Percent of individual segment |  | 7.00% | 11.00% | 9.00%
Transportation Market Sector [Member] | Operating Segments [Member] | United States Electrical Construction And Facilities Services | UNITED STATES |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | $ 196,313 | $ 192,656 | $ 209,830
Percent of individual segment |  | 10.00% | 11.00% | 11.00%
Transportation Market Sector [Member] | Operating Segments [Member] | United States Mechanical Construction And Facilities Services | UNITED STATES |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | $ 84,503 | $ 70,692 | $ 32,686
Percent of individual segment |  | 2.00% | 2.00% | 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 |  | $ 14,962 | $ 6,882 | $ 19,888
Percent of individual segment |  | 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 |  | $ 213,315 | $ 185,996 | $ 202,428
Percent of individual segment |  | 6.00% | 5.00% | 6.00%
Hospitality Market Sector [Member] | Operating Segments [Member] | United States Electrical Construction And Facilities Services | UNITED STATES |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | $ 15,342 | $ 23,797 | $ 16,985
Percent of individual segment |  | 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 |  | $ 38,405 | $ 40,079 | $ 35,385
Percent of individual segment |  | 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] | $ 182,614 | $ 142,542 | $ 170,631
Percent of individual segment |  | 9.00% | 8.00% | 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] | $ 308,467 | $ 343,799 | $ 365,721
Percent of individual segment |  | 8.00% | 10.00% | 11.00%
Service Work [Member] | Operating Segments [Member] | United States Electrical Construction And Facilities Services | UNITED STATES |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | $ 39,199 | $ 26,858 | $ 38,500
Percent of individual segment |  | 2.00% | 1.00% | 2.00%
Service Work [Member] | Operating Segments [Member] | United States Mechanical Construction And Facilities Services | UNITED STATES |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | $ 466,860 | $ 378,054 | $ 378,839
Percent of individual segment |  | 12.00% | 11.00% | 11.00%
Service Work [Member] | Operating Segments [Member] | United Kingdom Building Services | UNITED KINGDOM |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | $ 261,889 | $ 221,373 | $ 212,876
Percent of individual segment |  | 51.00% | 51.00% | 50.00%
Mobile Mechanical Services [Member] | Operating Segments [Member] | United States Building Services | UNITED STATES |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | $ 1,501,919 | $ 1,282,803 | $ 1,253,209
Percent of individual segment |  | 61.00% | 60.00% | 59.00%
Commercial Site-Based Services [Member] | Operating Segments [Member] | United States Building Services | UNITED STATES |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | $ 680,351 | $ 587,345 | $ 571,345
Percent of individual segment |  | 28.00% | 28.00% | 27.00%
Government Site-Based Services [Member] | Operating Segments [Member] | United States Building Services | UNITED STATES |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | $ 184,272 | $ 167,990 | $ 176,282
Percent of individual segment |  | 7.00% | 8.00% | 8.00%
Energy Services [Member] | Operating Segments [Member] | United States Building Services | UNITED STATES |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | $ 102,350 | $ 95,878 | $ 120,825
Percent of individual segment |  | 4.00% | 4.00% | 6.00%
Field Services [Member] | Operating Segments [Member] | United States Industrial Services | UNITED STATES |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | $ 853,143 | $ 813,872 | $ 1,162,321
Percent of individual segment |  | 86.00% | 86.00% | 88.00%
Shop Services [Member] | Operating Segments [Member] | United States Industrial Services | UNITED STATES |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | $ 133,264 | $ 127,023 | $ 165,235
Percent of individual segment |  | 14.00% | 14.00% | 12.00%
Project Work [Member] | Operating Segments [Member] | United Kingdom Building Services | UNITED KINGDOM |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | $ 248,062 | $ 209,190 | $ 210,383
Percent of individual segment |  | 49.00% | 49.00% | 50.00%
[1] | Represents those projects which generally are completed within three months or less.

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- Definition Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e9038-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130545-203045 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8933-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8933-108599 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8906-108599 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8736-108599 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8736-108599 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130543-203045 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e9054-108599 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e9031-108599 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 924 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 11.L) -URI http://asc.fasb.org/extlink&oid=6472922&loc=d3e499488-122856 + Details
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