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Operations by Business Segment and Geographic Area - Total Assets and Goodwill (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Segment reporting information    
Total assets $ 9,327,692 $ 9,216,417
Goodwill 564,683 532,239
Energy & Chemicals    
Segment reporting information    
Goodwill 12,600 12,600
Mining, Industrial, Infrastructure & Power    
Segment reporting information    
Goodwill 17,800 16,500
Government Segment    
Segment reporting information    
Goodwill 58,000 58,000
Diversified Services    
Segment reporting information    
Goodwill 476,300 445,100
Reportable segments | Energy & Chemicals    
Segment reporting information    
Total assets 1,674,200 2,235,700
Reportable segments | Mining, Industrial, Infrastructure & Power    
Segment reporting information    
Total assets 1,067,300 862,400
Reportable segments | Government Segment    
Segment reporting information    
Total assets 732,000 493,700
Reportable segments | Diversified Services    
Segment reporting information    
Total assets 2,120,400 1,952,700
Corporate and other    
Segment reporting information    
Total assets $ 3,733,800 $ 3,671,900