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Operations by Business Segment and Geographic Area - External Revenue and Segment Profit (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
External revenue |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 5,027,400 | $ 4,941,600 | $ 4,716,100 | $ 4,835,900 | $ 4,989,600 | $ 4,766,900 | $ 4,856,100 | $ 4,423,900 | $ 19,520,970 | $ 19,036,525 | $ 18,114,048
Reportable segments |  |  |  |  |  |  |  |  |  |  |
Segment Profit (Loss) |  |  |  |  |  |  |  |  |  |  |
Segment Profit (Loss) |  |  |  |  |  |  |  |  | 545,400 | 744,300 | 1,032,200
Energy & Chemicals |  |  |  |  |  |  |  |  |  |  |
External revenue |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 8,565,800 | 9,250,000 | 10,040,200
Energy & Chemicals | Reportable segments |  |  |  |  |  |  |  |  |  |  |
Segment Profit (Loss) |  |  |  |  |  |  |  |  |  |  |
Segment Profit (Loss) |  |  |  |  |  |  |  |  | 424,900 | 366,400 | 764,500
Mining, Industrial, Infrastructure & Power |  |  |  |  |  |  |  |  |  |  |
External revenue |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 5,178,400 | 4,598,700 | 4,089,200
Mining, Industrial, Infrastructure & Power | Reportable segments |  |  |  |  |  |  |  |  |  |  |
Segment Profit (Loss) |  |  |  |  |  |  |  |  |  |  |
Segment Profit (Loss) |  |  |  |  |  |  |  |  | (141,000) | 170,900 | 57,200
Government Segment |  |  |  |  |  |  |  |  |  |  |
External revenue |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 3,232,700 | 2,720,000 | 2,557,400
Government Segment | Reportable segments |  |  |  |  |  |  |  |  |  |  |
Segment Profit (Loss) |  |  |  |  |  |  |  |  |  |  |
Segment Profit (Loss) |  |  |  |  |  |  |  |  | 127,900 | 85,100 | 83,100
Diversified Services |  |  |  |  |  |  |  |  |  |  |
External revenue |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 2,544,100 | 2,467,800 | 1,427,200
Diversified Services | Reportable segments |  |  |  |  |  |  |  |  |  |  |
Segment Profit (Loss) |  |  |  |  |  |  |  |  |  |  |
Segment Profit (Loss) |  |  |  |  |  |  |  |  | 133,600 | 121,900 | 127,400
Diversified Services | Intercompany |  |  |  |  |  |  |  |  |  |  |
External revenue |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 589,000 | $ 524,000 | $ 439,000

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