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Revenue from Contracts with Customers - Schedule of Revenue. Remaining Performance Obligation, Expected Timing of Satisfaction (Details) $ in Thousands | Jun. 30, 2018 USD ($)
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Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |
Remaining performance obligations | $ 3,673,131
UNITED STATES |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |
Remaining performance obligations | 3,542,789
United States Electrical Construction And Facilities Services [Member] | UNITED STATES |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |
Remaining performance obligations | 1,037,796
United States Mechanical Construction And Facilities Services [Member] | UNITED STATES |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |
Remaining performance obligations | 1,970,393
United States Building Services [Member] | UNITED STATES |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |
Remaining performance obligations | 451,960
United States Industrial Services [Member] | UNITED STATES |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |
Remaining performance obligations | 82,640
United Kingdom Building Services [Member] [Member] | UNITED KINGDOM |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |
Remaining performance obligations | 130,342
Within One Year |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |
Remaining performance obligations | 2,961,238
Within One Year | UNITED STATES |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |
Remaining performance obligations | 2,882,579
Within One Year | United States Electrical Construction And Facilities Services [Member] | UNITED STATES |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |
Remaining performance obligations | 910,676
Within One Year | United States Mechanical Construction And Facilities Services [Member] | UNITED STATES |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |
Remaining performance obligations | 1,453,161
Within One Year | United States Building Services [Member] | UNITED STATES |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |
Remaining performance obligations | 436,102
Within One Year | United States Industrial Services [Member] | UNITED STATES |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |
Remaining performance obligations | 82,640
Within One Year | United Kingdom Building Services [Member] [Member] | UNITED KINGDOM |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |
Remaining performance obligations | 78,659
Greater Than One Year |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |
Remaining performance obligations | 711,893
Greater Than One Year | UNITED STATES |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |
Remaining performance obligations | 660,210
Greater Than One Year | United States Electrical Construction And Facilities Services [Member] | UNITED STATES |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |
Remaining performance obligations | 127,120
Greater Than One Year | United States Mechanical Construction And Facilities Services [Member] | UNITED STATES |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |
Remaining performance obligations | 517,232
Greater Than One Year | United States Building Services [Member] | UNITED STATES |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |
Remaining performance obligations | 15,858
Greater Than One Year | United States Industrial Services [Member] | UNITED STATES |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |
Remaining performance obligations | 0
Greater Than One Year | United Kingdom Building Services [Member] [Member] | UNITED KINGDOM |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |
Remaining performance obligations | $ 51,683

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