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Revenue from Contracts with Customers - Schedule of Revenue, Remaining Performance Obligation (Details) $ in Thousands | 9 Months Ended
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Sep. 30, 2018 USD ($)
Schedule of Remaining Performance Obligations [Line Items] |
Remaining performance obligations | $ 3,969,668
Remaining performance obligations, percent | 100.00%
UNITED STATES |
Schedule of Remaining Performance Obligations [Line Items] |
Remaining performance obligations | $ 3,842,936
Remaining performance obligations, percent | 97.00%
UNITED STATES | United States Electrical Construction And Facilities Services [Member] |
Schedule of Remaining Performance Obligations [Line Items] |
Remaining performance obligations | $ 1,181,620
Remaining performance obligations, percent | 30.00%
UNITED STATES | United States Mechanical Construction And Facilities Services [Member] |
Schedule of Remaining Performance Obligations [Line Items] |
Remaining performance obligations | $ 2,152,271
Remaining performance obligations, percent | 54.00%
UNITED STATES | United States Building Services [Member] |
Schedule of Remaining Performance Obligations [Line Items] |
Remaining performance obligations | $ 434,386
Remaining performance obligations, percent | 11.00%
UNITED STATES | United States Industrial Services [Member] |
Schedule of Remaining Performance Obligations [Line Items] |
Remaining performance obligations | $ 74,659
Remaining performance obligations, percent | 2.00%
UNITED KINGDOM | United Kingdom Building Services [Member] [Member] |
Schedule of Remaining Performance Obligations [Line Items] |
Remaining performance obligations | $ 126,732
Remaining performance obligations, percent | 3.00%

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- Definition Amount of transaction price allocated to performance obligation that has not been recognized as revenue. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130556-203045 + Details
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