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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