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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, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues from unrelated entities |  | $ 2,521,672 | $ 2,201,714 | $ 7,263,387 | $ 6,515,567
UNITED STATES |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues from unrelated entities |  | 2,392,192 | 2,091,639 | 6,877,298 | 6,199,998
United States Electrical Construction And Facilities Services [Member] | UNITED STATES |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues from unrelated entities |  | 527,935 | 472,084 | 1,473,590 | 1,344,275
United States Electrical Construction And Facilities Services [Member] | UNITED STATES | Operating Segments [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues from unrelated entities |  | 528,591 | 473,892 | 1,476,034 | 1,347,729
United States Electrical Construction And Facilities Services [Member] | UNITED STATES | Operating Segments [Member] | Commercial Market Sector [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues from unrelated entities |  | $ 274,954 | $ 252,197 | $ 773,711 | $ 704,361
Percent of individual segment |  | 52.00% | 53.00% | 52.00% | 52.00%
United States Electrical Construction And Facilities Services [Member] | UNITED STATES | Operating Segments [Member] | Institutional Market Sector [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues from unrelated entities |  | $ 42,002 | $ 36,230 | $ 137,718 | $ 106,314
Percent of individual segment |  | 8.00% | 8.00% | 9.00% | 8.00%
United States Electrical Construction And Facilities Services [Member] | UNITED STATES | Operating Segments [Member] | Hospitality Market Sector [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues from unrelated entities |  | $ 2,522 | $ 7,028 | $ 11,286 | $ 17,009
Percent of individual segment |  | 1.00% | 1.00% | 1.00% | 1.00%
United States Electrical Construction And Facilities Services [Member] | UNITED STATES | Operating Segments [Member] | Manufacturing Market Sector [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues from unrelated entities |  | $ 60,965 | $ 62,537 | $ 161,386 | $ 185,290
Percent of individual segment |  | 11.00% | 13.00% | 11.00% | 14.00%
United States Electrical Construction And Facilities Services [Member] | UNITED STATES | Operating Segments [Member] | Healthcare Market Sector [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues from unrelated entities |  | $ 29,377 | $ 16,929 | $ 74,469 | $ 52,179
Percent of individual segment |  | 6.00% | 4.00% | 5.00% | 4.00%
United States Electrical Construction And Facilities Services [Member] | UNITED STATES | Operating Segments [Member] | Transportation Market Sector [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues from unrelated entities |  | $ 49,578 | $ 58,765 | $ 144,788 | $ 150,911
Percent of individual segment |  | 9.00% | 12.00% | 10.00% | 11.00%
United States Electrical Construction And Facilities Services [Member] | UNITED STATES | Operating Segments [Member] | Water and Wastewater Market Sector [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues from unrelated entities |  | $ 4,381 | $ 2,351 | $ 9,909 | $ 6,587
Percent of individual segment |  | 1.00% | 1.00% | 1.00% | 1.00%
United States Electrical Construction And Facilities Services [Member] | UNITED STATES | Operating Segments [Member] | Short Duration Projects [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues from unrelated entities | [1] | $ 53,881 | $ 31,008 | $ 135,165 | $ 104,785
Percent of individual segment |  | 10.00% | 7.00% | 9.00% | 8.00%
United States Electrical Construction And Facilities Services [Member] | UNITED STATES | Operating Segments [Member] | Service Work [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues from unrelated entities |  | $ 10,931 | $ 6,847 | $ 27,602 | $ 20,293
Percent of individual segment |  | 2.00% | 1.00% | 2.00% | 1.00%
United States Electrical Construction And Facilities Services [Member] | UNITED STATES | Intersegment Eliminations [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues from unrelated entities |  | $ (656) | $ (1,808) | $ (2,444) | $ (3,454)
United States Mechanical Construction And Facilities Services [Member] | UNITED STATES |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues from unrelated entities |  | 999,584 | 891,509 | 2,862,195 | 2,516,062
United States Mechanical Construction And Facilities Services [Member] | UNITED STATES | Operating Segments [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues from unrelated entities |  | 1,001,492 | 893,667 | 2,867,461 | 2,521,074
United States Mechanical Construction And Facilities Services [Member] | UNITED STATES | Operating Segments [Member] | Commercial Market Sector [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues from unrelated entities |  | $ 369,654 | $ 346,911 | $ 1,133,811 | $ 925,035
Percent of individual segment |  | 37.00% | 39.00% | 40.00% | 37.00%
United States Mechanical Construction And Facilities Services [Member] | UNITED STATES | Operating Segments [Member] | Institutional Market Sector [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues from unrelated entities |  | $ 74,867 | $ 112,264 | $ 215,635 | $ 289,090
Percent of individual segment |  | 8.00% | 13.00% | 8.00% | 12.00%
United States Mechanical Construction And Facilities Services [Member] | UNITED STATES | Operating Segments [Member] | Hospitality Market Sector [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues from unrelated entities |  | $ 10,806 | $ 12,570 | $ 30,593 | $ 29,382
Percent of individual segment |  | 1.00% | 1.00% | 1.00% | 1.00%
United States Mechanical Construction And Facilities Services [Member] | UNITED STATES | Operating Segments [Member] | Manufacturing Market Sector [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues from unrelated entities |  | $ 142,250 | $ 93,919 | $ 349,901 | $ 310,109
Percent of individual segment |  | 14.00% | 11.00% | 12.00% | 12.00%
United States Mechanical Construction And Facilities Services [Member] | UNITED STATES | Operating Segments [Member] | Healthcare Market Sector [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues from unrelated entities |  | $ 123,071 | $ 78,814 | $ 357,601 | $ 247,401
Percent of individual segment |  | 12.00% | 9.00% | 12.00% | 10.00%
United States Mechanical Construction And Facilities Services [Member] | UNITED STATES | Operating Segments [Member] | Transportation Market Sector [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues from unrelated entities |  | $ 23,954 | $ 19,824 | $ 63,075 | $ 53,839
Percent of individual segment |  | 3.00% | 2.00% | 2.00% | 2.00%
United States Mechanical Construction And Facilities Services [Member] | UNITED STATES | Operating Segments [Member] | Water and Wastewater Market Sector [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues from unrelated entities |  | $ 53,367 | $ 45,255 | $ 141,917 | $ 131,374
Percent of individual segment |  | 5.00% | 5.00% | 5.00% | 5.00%
United States Mechanical Construction And Facilities Services [Member] | UNITED STATES | Operating Segments [Member] | Short Duration Projects [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues from unrelated entities | [1] | $ 82,510 | $ 84,461 | $ 254,897 | $ 255,618
Percent of individual segment |  | 8.00% | 9.00% | 9.00% | 10.00%
United States Mechanical Construction And Facilities Services [Member] | UNITED STATES | Operating Segments [Member] | Service Work [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues from unrelated entities |  | $ 121,013 | $ 99,649 | $ 320,031 | $ 279,226
Percent of individual segment |  | 12.00% | 11.00% | 11.00% | 11.00%
United States Mechanical Construction And Facilities Services [Member] | UNITED STATES | Intersegment Eliminations [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues from unrelated entities |  | $ (1,908) | $ (2,158) | $ (5,266) | $ (5,012)
United States Building Services [Member] | UNITED STATES |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues from unrelated entities |  | 632,455 | 556,514 | 1,838,750 | 1,563,107
United States Building Services [Member] | UNITED STATES | Commercial Site-Based Services [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues from unrelated entities |  | $ 166,375 | $ 147,768 | $ 494,873 | $ 423,284
Percent of individual segment |  | 26.00% | 27.00% | 27.00% | 27.00%
United States Building Services [Member] | UNITED STATES | Government Site-Based Services [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues from unrelated entities |  | $ 49,293 | $ 44,664 | $ 136,952 | $ 126,000
Percent of individual segment |  | 8.00% | 8.00% | 8.00% | 8.00%
United States Building Services [Member] | UNITED STATES | Mobile Mechanical Services [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues from unrelated entities |  | $ 394,559 | $ 341,279 | $ 1,128,322 | $ 943,729
Percent of individual segment |  | 62.00% | 61.00% | 61.00% | 61.00%
United States Building Services [Member] | UNITED STATES | Energy Services [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues from unrelated entities |  | $ 22,228 | $ 22,803 | $ 78,603 | $ 70,094
Percent of individual segment |  | 4.00% | 4.00% | 4.00% | 4.00%
United States Industrial Services [Member] | UNITED STATES |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues from unrelated entities |  | $ 232,218 | $ 171,532 | $ 702,763 | $ 776,554
United States Industrial Services [Member] | UNITED STATES | Field Services [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues from unrelated entities |  | $ 196,846 | $ 145,165 | $ 613,197 | $ 675,107
Percent of individual segment |  | 85.00% | 85.00% | 87.00% | 87.00%
United States Industrial Services [Member] | UNITED STATES | Shop Services [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues from unrelated entities |  | $ 35,372 | $ 26,367 | $ 89,566 | $ 101,447
Percent of individual segment |  | 15.00% | 15.00% | 13.00% | 13.00%
United Kingdom Building Services [Member] [Member] | UNITED KINGDOM |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues from unrelated entities |  | $ 129,480 | $ 110,075 | $ 386,089 | $ 315,569
United Kingdom Building Services [Member] [Member] | UNITED KINGDOM | Service Work [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues from unrelated entities |  | $ 65,486 | $ 55,594 | $ 194,049 | $ 161,839
Percent of individual segment |  | 51.00% | 51.00% | 50.00% | 51.00%
United Kingdom Building Services [Member] [Member] | UNITED KINGDOM | Project Work [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues from unrelated entities |  | $ 63,994 | $ 54,481 | $ 192,040 | $ 153,730
Percent of individual segment |  | 49.00% | 49.00% | 50.00% | 49.00%
[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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