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Revenue from Contracts with Customers - Schedule of Disaggregation of Revenue (Details) $ in Thousands | 3 Months Ended
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Mar. 31, 2018 USD ($)
Disaggregation of Revenue [Line Items] |  |
Revenues, disaggregation | $ 1,900,388 |
UNITED STATES |  |
Disaggregation of Revenue [Line Items] |  |
Revenues, disaggregation | 1,793,498 |
United States Electrical Construction And Facilities Services [Member] | UNITED STATES |  |
Disaggregation of Revenue [Line Items] |  |
Revenues, disaggregation | 454,752 |
United States Mechanical Construction And Facilities Services [Member] | UNITED STATES |  |
Disaggregation of Revenue [Line Items] |  |
Revenues, disaggregation | 698,847 |
United States Building Services [Member] | UNITED STATES |  |
Disaggregation of Revenue [Line Items] |  |
Revenues, disaggregation | 454,752 |
United States Industrial Services [Member] | UNITED STATES |  |
Disaggregation of Revenue [Line Items] |  |
Revenues, disaggregation | 185,147 |
United Kingdom Building Services [Member] [Member] | UNITED KINGDOM |  |
Disaggregation of Revenue [Line Items] |  |
Revenues, disaggregation | 106,890 |
Operating Segments [Member] | United States Electrical Construction And Facilities Services [Member] | UNITED STATES |  |
Disaggregation of Revenue [Line Items] |  |
Revenues, disaggregation | 455,782 |
Operating Segments [Member] | United States Mechanical Construction And Facilities Services [Member] | UNITED STATES |  |
Disaggregation of Revenue [Line Items] |  |
Revenues, disaggregation | 702,072 |
Intersegment Eliminations [Member] | United States Electrical Construction And Facilities Services [Member] | UNITED STATES |  |
Disaggregation of Revenue [Line Items] |  |
Revenues, disaggregation | (1,030) |
Intersegment Eliminations [Member] | United States Mechanical Construction And Facilities Services [Member] | UNITED STATES |  |
Disaggregation of Revenue [Line Items] |  |
Revenues, disaggregation | (3,225) |
Commercial Market Sector [Member] | United States Electrical Construction And Facilities Services [Member] | UNITED STATES |  |
Disaggregation of Revenue [Line Items] |  |
Revenues, disaggregation | $ 184,382 |
Percent of total segment | 40.00% |
Commercial Market Sector [Member] | United States Mechanical Construction And Facilities Services [Member] | UNITED STATES |  |
Disaggregation of Revenue [Line Items] |  |
Revenues, disaggregation | $ 231,851 |
Percent of total segment | 33.00% |
Institutional Market Sector [Member] | United States Electrical Construction And Facilities Services [Member] | UNITED STATES |  |
Disaggregation of Revenue [Line Items] |  |
Revenues, disaggregation | $ 28,008 |
Percent of total segment | 6.00% |
Institutional Market Sector [Member] | United States Mechanical Construction And Facilities Services [Member] | UNITED STATES |  |
Disaggregation of Revenue [Line Items] |  |
Revenues, disaggregation | $ 65,627 |
Percent of total segment | 9.00% |
Hospitality Market Sector [Member] | United States Electrical Construction And Facilities Services [Member] | UNITED STATES |  |
Disaggregation of Revenue [Line Items] |  |
Revenues, disaggregation | $ 5,516 |
Percent of total segment | 1.00% |
Hospitality Market Sector [Member] | United States Mechanical Construction And Facilities Services [Member] | UNITED STATES |  |
Disaggregation of Revenue [Line Items] |  |
Revenues, disaggregation | $ 26,527 |
Percent of total segment | 4.00% |
Manufacturing Market Sector [Member] | United States Electrical Construction And Facilities Services [Member] | UNITED STATES |  |
Disaggregation of Revenue [Line Items] |  |
Revenues, disaggregation | $ 85,794 |
Percent of total segment | 19.00% |
Manufacturing Market Sector [Member] | United States Mechanical Construction And Facilities Services [Member] | UNITED STATES |  |
Disaggregation of Revenue [Line Items] |  |
Revenues, disaggregation | $ 99,876 |
Percent of total segment | 14.00% |
Healthcare Market Sector [Member] | United States Electrical Construction And Facilities Services [Member] | UNITED STATES |  |
Disaggregation of Revenue [Line Items] |  |
Revenues, disaggregation | $ 38,507 |
Percent of total segment | 8.00% |
Healthcare Market Sector [Member] | United States Mechanical Construction And Facilities Services [Member] | UNITED STATES |  |
Disaggregation of Revenue [Line Items] |  |
Revenues, disaggregation | $ 66,114 |
Percent of total segment | 10.00% |
Transportation Market Sector [Member] | United States Electrical Construction And Facilities Services [Member] | UNITED STATES |  |
Disaggregation of Revenue [Line Items] |  |
Revenues, disaggregation | $ 71,264 |
Percent of total segment | 16.00% |
Transportation Market Sector [Member] | United States Mechanical Construction And Facilities Services [Member] | UNITED STATES |  |
Disaggregation of Revenue [Line Items] |  |
Revenues, disaggregation | $ 5,206 |
Percent of total segment | 1.00% |
Water and Wastewater Market Sector [Member] | United States Electrical Construction And Facilities Services [Member] | UNITED STATES |  |
Disaggregation of Revenue [Line Items] |  |
Revenues, disaggregation | $ 4,613 |
Percent of total segment | 1.00% |
Water and Wastewater Market Sector [Member] | United States Mechanical Construction And Facilities Services [Member] | UNITED STATES |  |
Disaggregation of Revenue [Line Items] |  |
Revenues, disaggregation | $ 36,751 |
Percent of total segment | 5.00% |
Short Duration Projects [Member] | United States Electrical Construction And Facilities Services [Member] | UNITED STATES |  |
Disaggregation of Revenue [Line Items] |  |
Revenues, disaggregation | $ 29,530 | [1]
Percent of total segment | 7.00% |
Short Duration Projects [Member] | United States Mechanical Construction And Facilities Services [Member] | UNITED STATES |  |
Disaggregation of Revenue [Line Items] |  |
Revenues, disaggregation | $ 83,895 | [1]
Percent of total segment | 12.00% |
Service Work [Member] | United States Electrical Construction And Facilities Services [Member] | UNITED STATES |  |
Disaggregation of Revenue [Line Items] |  |
Revenues, disaggregation | $ 8,168 |
Percent of total segment | 2.00% |
Service Work [Member] | United States Mechanical Construction And Facilities Services [Member] | UNITED STATES |  |
Disaggregation of Revenue [Line Items] |  |
Revenues, disaggregation | $ 86,225 |
Percent of total segment | 12.00% |
Service Work [Member] | United Kingdom Building Services [Member] [Member] | UNITED KINGDOM |  |
Disaggregation of Revenue [Line Items] |  |
Revenues, disaggregation | $ 55,275 |
Percent of total segment | 52.00% |
Commercial Site-Based Services [Member] | United States Building Services [Member] | UNITED STATES |  |
Disaggregation of Revenue [Line Items] |  |
Revenues, disaggregation | $ 146,761 |
Percent of total segment | 32.00% |
Government Site-Based Services [Member] | United States Building Services [Member] | UNITED STATES |  |
Disaggregation of Revenue [Line Items] |  |
Revenues, disaggregation | $ 55,409 |
Percent of total segment | 12.00% |
Mechanical Services [Member] | United States Building Services [Member] | UNITED STATES |  |
Disaggregation of Revenue [Line Items] |  |
Revenues, disaggregation | $ 227,342 |
Percent of total segment | 50.00% |
Energy Services [Member] | United States Building Services [Member] | UNITED STATES |  |
Disaggregation of Revenue [Line Items] |  |
Revenues, disaggregation | $ 25,240 |
Percent of total segment | 6.00% |
Field Services [Member] | United States Industrial Services [Member] | UNITED STATES |  |
Disaggregation of Revenue [Line Items] |  |
Revenues, disaggregation | $ 148,090 |
Percent of total segment | 80.00% |
Shop Services [Member] | United States Industrial Services [Member] | UNITED STATES |  |
Disaggregation of Revenue [Line Items] |  |
Revenues, disaggregation | $ 37,057 |
Percent of total segment | 20.00% |
Projects & Extras [Member] | United Kingdom Building Services [Member] [Member] | UNITED KINGDOM |  |
Disaggregation of Revenue [Line Items] |  |
Revenues, disaggregation | $ 51,615 |
Percent of total segment | 48.00% |
[1] | Represents those projects which generally are completed within three months or less.

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- Definition Amount, excluding 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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 32 -Paragraph 2A -URI http://asc.fasb.org/extlink&oid=82859839&loc=SL82860478-203043 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130543-203045 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130539-203045 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130545-203045 + Details
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