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Revenue from Contracts with Customers - Schedule of Revenue, Remaining Performance Obligation (Details) $ in Thousands	Sep. 30, 2019 USD ($)
Schedule of Remaining Performance Obligations [Line Items]
Remaining performance obligations	$ 4,035,088
Remaining performance obligations, percent	100.00%
UNITED STATES
Schedule of Remaining Performance Obligations [Line Items]
Remaining performance obligations	$ 3,914,201
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	$ 1,095,254
Remaining performance obligations, percent	27.00%
UNITED STATES | United States Mechanical Construction And Facilities Services [Member]
Schedule of Remaining Performance Obligations [Line Items]
Remaining performance obligations	$ 2,190,556
Remaining performance obligations, percent	54.00%
UNITED STATES | United States Building Services [Member]
Schedule of Remaining Performance Obligations [Line Items]
Remaining performance obligations	$ 544,913
Remaining performance obligations, percent	14.00%
UNITED STATES | United States Industrial Services [Member]
Schedule of Remaining Performance Obligations [Line Items]
Remaining performance obligations	$ 83,478
Remaining performance obligations, percent	2.00%
UNITED KINGDOM | United Kingdom Building Services [Member] [Member]
Schedule of Remaining Performance Obligations [Line Items]
Remaining performance obligations	$ 120,887
Remaining performance obligations, percent	3.00%

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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=118956577&loc=SL49130556-203045

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Percentage of remaining performance obligation to total remaining performance obligation not recognized as revenue.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 13
-Subparagraph (b)(1)
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