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Operating Information by Segment and Geographic Area - External Revenue and Segment Profit (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Segment reporting information |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 3,655,700 | $ 3,803,200 | $ 4,091,000 | $ 4,118,600 | $ 4,408,700 | $ 4,628,600 | $ 4,146,400 | $ 4,133,600 | $ 15,668,477 | $ 17,317,284 | $ 18,851,008
Segment profit (loss) |  |  |  |  |  |  |  |  | 317,000 | (185,600) | 510,000
Depreciation (all but Corporate included in segment profit) |  |  |  |  |  |  |  |  | 102,451 | 154,599 | 197,585
Capital expenditures |  |  |  |  |  |  |  |  | 113,442 | 180,842 | 210,998
Total assets | 7,309,812 |  |  |  | 7,966,658 |  |  |  | 7,309,812 | 7,966,658 |
Goodwill | 349,258 |  |  |  | 508,415 |  |  |  | 349,258 | 508,415 |
Continuing Operations |  |  |  |  |  |  |  |  |  |  |
Segment reporting information |  |  |  |  |  |  |  |  |  |  |
Depreciation (all but Corporate included in segment profit) |  |  |  |  |  |  |  |  | 102,500 | 110,300 | 125,400
Capital expenditures |  |  |  |  |  |  |  |  | 90,000 | 112,800 | 170,100
Discontinued Operations - Assets held for sale | 48,999 |  |  |  | 123,438 |  |  |  | 48,999 | 123,438 |
Discontinued Operations |  |  |  |  |  |  |  |  |  |  |
Segment reporting information |  |  |  |  |  |  |  |  |  |  |
Depreciation (all but Corporate included in segment profit) |  |  |  |  |  |  |  |  |  | 44,000 | 72,000
Discontinued Operations - Assets held for sale | 188,618 |  |  |  | 393,662 |  |  |  | 188,618 | 393,662 |
Capital Expenditure, Discontinued Operations |  |  |  |  |  |  |  |  | (23,000) | (68,000) | (41,000)
Reportable segments |  |  |  |  |  |  |  |  |  |  |
Segment reporting information |  |  |  |  |  |  |  |  |  |  |
Goodwill | 349,300 |  |  |  | 508,400 |  |  |  | 349,300 | 508,400 |
Reportable segments | Continuing Operations |  |  |  |  |  |  |  |  |  |  |
Segment reporting information |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 15,668,500 | 17,317,300 | 18,851,000
Segment profit (loss) |  |  |  |  |  |  |  |  | 317,000 | (185,600) | 510,000
Corporate |  |  |  |  |  |  |  |  |  |  |
Segment reporting information |  |  |  |  |  |  |  |  |  |  |
Total assets | 3,574,700 |  |  |  | 3,379,300 |  |  |  | 3,574,700 | 3,379,300 |
Corporate | Continuing Operations |  |  |  |  |  |  |  |  |  |  |
Segment reporting information |  |  |  |  |  |  |  |  |  |  |
Depreciation (all but Corporate included in segment profit) |  |  |  |  |  |  |  |  | 64,900 | 61,700 | 59,800
Capital expenditures |  |  |  |  |  |  |  |  | 30,000 | 62,500 | 90,000
Energy & Chemicals | Reportable segments |  |  |  |  |  |  |  |  |  |  |
Segment reporting information |  |  |  |  |  |  |  |  |  |  |
Total assets | 1,004,600 |  |  |  | 1,139,300 |  |  |  | 1,004,600 | 1,139,300 |
Goodwill | 12,600 |  |  |  | 12,600 |  |  |  | 12,600 | 12,600 |
Energy & Chemicals | Reportable segments | Continuing Operations |  |  |  |  |  |  |  |  |  |  |
Segment reporting information |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 5,260,400 | 5,823,700 | 7,695,500
Segment profit (loss) |  |  |  |  |  |  |  |  | 163,700 | (95,000) | 334,500
Depreciation (all but Corporate included in segment profit) |  |  |  |  |  |  |  |  | 0 | 0 | 0
Capital expenditures |  |  |  |  |  |  |  |  | 0 | 0 | 0
Mining & Industrial | Reportable segments |  |  |  |  |  |  |  |  |  |  |
Segment reporting information |  |  |  |  |  |  |  |  |  |  |
Total assets | 508,500 |  |  |  | 594,900 |  |  |  | 508,500 | 594,900 |
Goodwill | 9,200 |  |  |  | 8,200 |  |  |  | 9,200 | 8,200 |
Mining & Industrial | Reportable segments | Continuing Operations |  |  |  |  |  |  |  |  |  |  |
Segment reporting information |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 4,149,100 | 5,057,200 | 3,491,000
Segment profit (loss) |  |  |  |  |  |  |  |  | 122,400 | 158,500 | 94,300
Depreciation (all but Corporate included in segment profit) |  |  |  |  |  |  |  |  | 0 | 0 | 0
Capital expenditures |  |  |  |  |  |  |  |  | 0 | 0 | 0
Infrastructure & Power | Reportable segments |  |  |  |  |  |  |  |  |  |  |
Segment reporting information |  |  |  |  |  |  |  |  |  |  |
Total assets | 469,300 |  |  |  | 471,300 |  |  |  | 469,300 | 471,300 |
Goodwill | 2,500 |  |  |  | 2,500 |  |  |  | 2,500 | 2,500 |
Infrastructure & Power | Reportable segments | Continuing Operations |  |  |  |  |  |  |  |  |  |  |
Segment reporting information |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 1,595,500 | 1,370,400 | 1,668,000
Segment profit (loss) |  |  |  |  |  |  |  |  | 13,700 | (243,900) | (30,100)
Depreciation (all but Corporate included in segment profit) |  |  |  |  |  |  |  |  | 10,000 | 7,300 | 6,700
Capital expenditures |  |  |  |  |  |  |  |  | 28,800 | 12,200 | 24,500
Government | Reportable segments |  |  |  |  |  |  |  |  |  |  |
Segment reporting information |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 2,922,800 | 2,969,300 | 3,678,500
Total assets | 575,400 |  |  |  | 629,100 |  |  |  | 575,400 | 629,100 |
Goodwill | 58,000 |  |  |  | 58,000 |  |  |  | 58,000 | 58,000 |
Government | Reportable segments | Continuing Operations |  |  |  |  |  |  |  |  |  |  |
Segment reporting information |  |  |  |  |  |  |  |  |  |  |
Segment profit (loss) |  |  |  |  |  |  |  |  | 88,400 | 200,300 | 187,300
Depreciation (all but Corporate included in segment profit) |  |  |  |  |  |  |  |  | 4,000 | 4,000 | 3,600
Capital expenditures |  |  |  |  |  |  |  |  | 3,200 | 3,000 | 6,900
Diversified Services |  |  |  |  |  |  |  |  |  |  |
Segment reporting information |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 270,000 | 322,000 | 332,000
Diversified Services | Reportable segments |  |  |  |  |  |  |  |  |  |  |
Segment reporting information |  |  |  |  |  |  |  |  |  |  |
Total assets | 950,600 |  |  |  | 1,290,600 |  |  |  | 950,600 | 1,290,600 |
Goodwill | 260,800 |  |  |  | 420,900 |  |  |  | 260,800 | 420,900 |
Diversified Services | Reportable segments | Continuing Operations |  |  |  |  |  |  |  |  |  |  |
Segment reporting information |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 1,630,900 | 2,040,100 | 2,257,200
Segment profit (loss) |  |  |  |  |  |  |  |  | 14,200 | 14,600 | 68,700
Depreciation (all but Corporate included in segment profit) |  |  |  |  |  |  |  |  | 21,900 | 34,500 | 52,100
Capital expenditures |  |  |  |  |  |  |  |  | 24,600 | 33,600 | 46,900
Other | Reportable segments |  |  |  |  |  |  |  |  |  |  |
Segment reporting information |  |  |  |  |  |  |  |  |  |  |
Total assets | 38,100 |  |  |  | 68,500 |  |  |  | 38,100 | 68,500 |
Goodwill | $ 6,200 |  |  |  | $ 6,200 |  |  |  | 6,200 | 6,200 |
Other | Reportable segments | Continuing Operations |  |  |  |  |  |  |  |  |  |  |
Segment reporting information |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 109,800 | 56,600 | 60,800
Segment profit (loss) |  |  |  |  |  |  |  |  | (85,400) | (220,100) | (144,700)
Depreciation (all but Corporate included in segment profit) |  |  |  |  |  |  |  |  | 1,700 | 2,800 | 3,200
Capital expenditures |  |  |  |  |  |  |  |  | $ 3,400 | $ 1,500 | $ 1,800

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