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Revenue from Contracts with Customers - Schedule of Revenue, Remaining Performance Obligation (Details) $ in Thousands | Sep. 30, 2019 USD ($)
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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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