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Revenue from Contracts with Customers - Schedule of Disaggregation of Revenues (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Disaggregation of Revenue [Line Items] |  |  |
Revenues from unrelated entities |  | $ 2,304,049 | $ 2,299,832
UNITED STATES |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from unrelated entities |  | 2,177,314 | 2,187,455
United States Electrical Construction And Facilities Services [Member] | UNITED STATES |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from unrelated entities |  | 456,168 | 461,803
United States Electrical Construction And Facilities Services [Member] | UNITED STATES | Operating Segments [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from unrelated entities |  | 457,363 | 462,615
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 |  | $ 244,983 | $ 239,846
Percent of individual segment |  | 53.00% | 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 |  | $ 43,129 | $ 37,393
Percent of individual segment |  | 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 |  | $ 4,664 | $ 5,082
Percent of individual segment |  | 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 |  | $ 48,423 | $ 66,843
Percent of individual segment |  | 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 |  | $ 19,414 | $ 19,225
Percent of individual segment |  | 4.00% | 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 |  | $ 42,031 | $ 44,180
Percent of individual segment |  | 9.00% | 9.00%
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 |  | $ 3,651 | $ 2,329
Percent of individual segment |  | 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] | $ 43,800 | $ 40,270
Percent of individual segment |  | 10.00% | 9.00%
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 |  | $ 7,268 | $ 7,447
Percent of individual segment |  | 2.00% | 2.00%
United States Electrical Construction And Facilities Services [Member] | UNITED STATES | Intersegment Eliminations [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from unrelated entities |  | $ (1,195) | $ (812)
United States Mechanical Construction And Facilities Services [Member] | UNITED STATES |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from unrelated entities |  | 903,925 | 834,112
United States Mechanical Construction And Facilities Services [Member] | UNITED STATES | Operating Segments [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from unrelated entities |  | 905,546 | 835,996
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 |  | $ 366,675 | $ 304,690
Percent of individual segment |  | 40.00% | 36.00%
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 |  | $ 69,304 | $ 76,997
Percent of individual segment |  | 8.00% | 9.00%
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 |  | $ 8,529 | $ 7,714
Percent of individual segment |  | 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 |  | $ 105,427 | $ 115,582
Percent of individual segment |  | 12.00% | 14.00%
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 |  | $ 112,785 | $ 88,059
Percent of individual segment |  | 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 |  | $ 18,417 | $ 14,346
Percent of individual segment |  | 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 |  | $ 43,848 | $ 40,513
Percent of individual segment |  | 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] | $ 88,783 | $ 97,202
Percent of individual segment |  | 10.00% | 12.00%
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 |  | $ 91,778 | $ 90,893
Percent of individual segment |  | 10.00% | 11.00%
United States Mechanical Construction And Facilities Services [Member] | UNITED STATES | Intersegment Eliminations [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from unrelated entities |  | $ (1,621) | $ (1,884)
United States Building Services [Member] | UNITED STATES |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from unrelated entities |  | 581,839 | 527,611
United States Building Services [Member] | UNITED STATES | Commercial Site-Based Services [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from unrelated entities |  | $ 175,647 | $ 143,438
Percent of individual segment |  | 30.00% | 27.00%
United States Building Services [Member] | UNITED STATES | Government Site-Based Services [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from unrelated entities |  | $ 41,072 | $ 42,917
Percent of individual segment |  | 7.00% | 8.00%
United States Building Services [Member] | UNITED STATES | Mobile Mechanical Services [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from unrelated entities |  | $ 334,950 | $ 312,919
Percent of individual segment |  | 58.00% | 59.00%
United States Building Services [Member] | UNITED STATES | Energy Services [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from unrelated entities |  | $ 30,170 | $ 28,337
Percent of individual segment |  | 5.00% | 6.00%
United States Industrial Services [Member] | UNITED STATES |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from unrelated entities |  | $ 235,382 | $ 363,929
United States Industrial Services [Member] | UNITED STATES | Field Services [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from unrelated entities |  | $ 207,554 | $ 323,654
Percent of individual segment |  | 88.00% | 89.00%
United States Industrial Services [Member] | UNITED STATES | Shop Services [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from unrelated entities |  | $ 27,828 | $ 40,275
Percent of individual segment |  | 12.00% | 11.00%
United Kingdom Building Services [Member] [Member] | UNITED KINGDOM |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from unrelated entities |  | $ 126,735 | $ 112,377
United Kingdom Building Services [Member] [Member] | UNITED KINGDOM | Service Work [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from unrelated entities |  | $ 61,991 | $ 55,106
Percent of individual segment |  | 49.00% | 49.00%
United Kingdom Building Services [Member] [Member] | UNITED KINGDOM | Project Work [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from unrelated entities |  | $ 64,744 | $ 57,271
Percent of individual segment |  | 51.00% | 51.00%
[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=120311839&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=121604090&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=120311839&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=120311839&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=120311839&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=120311839&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=120311839&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=121604090&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=120311839&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=120311839&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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