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Revenue from Contracts with Customers - Schedule of Disaggregation of Revenues (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2022 | Mar. 31, 2021
Disaggregation of Revenue [Line Items] |  |  |
Revenues from unrelated entities |  | $ 2,592,549 | $ 2,304,049
UNITED STATES |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from unrelated entities |  | 2,461,052 | 2,177,314
United States Electrical Construction And Facilities Services [Member] | UNITED STATES |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from unrelated entities |  | 522,030 | 459,395
United States Electrical Construction And Facilities Services [Member] | UNITED STATES | Operating Segments [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from unrelated entities |  | 523,010 | 460,605
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 |  | $ 270,315 | $ 245,841
Percent of individual segment |  | 52.00% | 53.00%
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 |  | $ 66,465 | $ 48,454
Percent of individual segment |  | 13.00% | 11.00%
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 |  | $ 32,070 | $ 20,151
Percent of individual segment |  | 6.00% | 4.00%
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 |  | $ 31,766 | $ 43,639
Percent of individual segment |  | 6.00% | 9.00%
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 |  | $ 45,082 | $ 42,031
Percent of individual segment |  | 8.00% | 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 |  | $ 5,312 | $ 3,651
Percent of individual segment |  | 1.00% | 1.00%
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 |  | $ 2,623 | $ 4,664
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] | $ 56,048 | $ 44,409
Percent of individual segment |  | 11.00% | 10.00%
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 |  | $ 13,329 | $ 7,765
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 |  | $ (980) | $ (1,210)
United States Mechanical Construction And Facilities Services [Member] | UNITED STATES |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from unrelated entities |  | 1,000,470 | 914,501
United States Mechanical Construction And Facilities Services [Member] | UNITED STATES | Operating Segments [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from unrelated entities |  | 1,002,738 | 916,172
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 |  | $ 379,604 | $ 366,477
Percent of individual segment |  | 38.00% | 40.00%
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 |  | $ 149,571 | $ 121,686
Percent of individual segment |  | 15.00% | 13.00%
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 |  | $ 120,051 | $ 112,656
Percent of individual segment |  | 12.00% | 12.00%
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 |  | $ 70,627 | $ 69,304
Percent of individual segment |  | 7.00% | 8.00%
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 |  | $ 16,053 | $ 18,417
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 |  | $ 61,744 | $ 43,848
Percent of individual segment |  | 6.00% | 5.00%
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 |  | $ 8,079 | $ 8,529
Percent of individual segment |  | 1.00% | 1.00%
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] | $ 62,294 | $ 86,765
Percent of individual segment |  | 6.00% | 9.00%
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 |  | $ 134,715 | $ 88,490
Percent of individual segment |  | 13.00% | 10.00%
United States Mechanical Construction And Facilities Services [Member] | UNITED STATES | Intersegment Eliminations [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from unrelated entities |  | $ (2,268) | $ (1,671)
United States Building Services [Member] | UNITED STATES |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from unrelated entities |  | 627,801 | 568,036
United States Building Services [Member] | UNITED STATES | Mobile Mechanical Services [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from unrelated entities |  | $ 373,571 | $ 351,317
Percent of individual segment |  | 60.00% | 62.00%
United States Building Services [Member] | UNITED STATES | Commercial Site-Based Services [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from unrelated entities |  | $ 203,550 | $ 175,647
Percent of individual segment |  | 32.00% | 31.00%
United States Building Services [Member] | UNITED STATES | Government Site-Based Services [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from unrelated entities |  | $ 50,680 | $ 41,072
Percent of individual segment |  | 8.00% | 7.00%
United States Industrial Services [Member] | UNITED STATES |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from unrelated entities |  | $ 310,751 | $ 235,382
United States Industrial Services [Member] | UNITED STATES | Field Services [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from unrelated entities |  | $ 271,418 | $ 207,554
Percent of individual segment |  | 87.00% | 88.00%
United States Industrial Services [Member] | UNITED STATES | Shop Services [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from unrelated entities |  | $ 39,333 | $ 27,828
Percent of individual segment |  | 13.00% | 12.00%
United Kingdom Building Services [Member] [Member] | UNITED KINGDOM |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from unrelated entities |  | $ 131,497 | $ 126,735
United Kingdom Building Services [Member] [Member] | UNITED KINGDOM | Service Work [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from unrelated entities |  | $ 64,817 | $ 61,991
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 |  | $ 66,680 | $ 64,744
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=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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