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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