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Revenue from Contracts with Customers - Schedule of Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction (Details) $ in Thousands | Dec. 31, 2018 USD ($)
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Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |
Remaining performance obligations | $ 3,964,282
UNITED STATES |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |
Remaining performance obligations | 3,833,758
UNITED STATES | United States Electrical Construction And Facilities Services |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |
Remaining performance obligations | 1,085,571
UNITED STATES | United States Mechanical Construction And Facilities Services |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |
Remaining performance obligations | 2,245,584
UNITED STATES | United States Building Services |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |
Remaining performance obligations | 435,074
UNITED STATES | United States Industrial Services |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |
Remaining performance obligations | 67,529
UNITED KINGDOM | United Kingdom Building Services |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |
Remaining performance obligations | $ 130,524
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-01-01 |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period | 1 year
Remaining performance obligations | $ 3,308,986
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-01-01 | UNITED STATES |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period | 1 year
Remaining performance obligations | $ 3,231,102
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-01-01 | UNITED STATES | United States Electrical Construction And Facilities Services |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period | 1 year
Remaining performance obligations | $ 996,524
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-01-01 | UNITED STATES | United States Mechanical Construction And Facilities Services |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period | 1 year
Remaining performance obligations | $ 1,742,587
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-01-01 | UNITED STATES | United States Building Services |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period | 1 year
Remaining performance obligations | $ 424,462
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-01-01 | UNITED STATES | United States Industrial Services |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period | 1 year
Remaining performance obligations | $ 67,529
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-01-01 | UNITED KINGDOM | United Kingdom Building Services |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period | 1 year
Remaining performance obligations | $ 77,884
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01 |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period |
Remaining performance obligations | $ 655,296
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01 | UNITED STATES |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period |
Remaining performance obligations | $ 602,656
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01 | UNITED STATES | United States Electrical Construction And Facilities Services |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period |
Remaining performance obligations | $ 89,047
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01 | UNITED STATES | United States Mechanical Construction And Facilities Services |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period |
Remaining performance obligations | $ 502,997
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01 | UNITED STATES | United States Building Services |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period |
Remaining performance obligations | $ 10,612
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01 | UNITED STATES | United States Industrial Services |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period |
Remaining performance obligations | $ 0
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01 | UNITED KINGDOM | United Kingdom Building Services |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period |
Remaining performance obligations | $ 52,640

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