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Quarterly Financial Data (Unaudited) - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 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
Quarterly Data                  
Asset impairments   $ 298,000         $ 400 $ 90,400  
Allowance for credit loss $ 39,000   $ 35,000       39,000 35,000  
Charges from project positions due to Covid-19 related schedule delays and associated cost growth   52,000              
Impairment of assets held for sale (including Disc Ops) $ 46,000 100,000         145,700 0 $ 0
Charges from resolution of close-out matters with customer           $ 31,000      
Charges including settlement of client disputes and cost growth related to close-out matters         $ 109,000 26,000      
Charges from write-off of pre-contract costs         26,000        
Charges from schedule-driven cost growth and client and subcontractor negotiations         87,000        
Charges from late engineering changes, schedule-driven cost growth, and negotiations with clients and subcontractors on pending change orders     78,000   55,000        
Charges for late engineering changes, cost growth and ongoing assessments of certain unapproved change orders       $ 21,000 57,000 4,000      
Gains related to favorable dispute resolution       18,000 13,000        
Effect of forecast revision on estimated project cost       59,000          
Valuation allowance against deferred tax assets during the period     185,000 546,000          
Impairment, restructuring and other exit costs     145,000 $ 334,000 27,000 27,000 305,590 532,600 0
Loss on pension settlement     138,000       $ (400) $ 137,900 $ 21,900
Previously unrecognized service fee revenue     89,000            
Offshore Project                  
Quarterly Data                  
Charges from late design changes, schedule-driven cost growth including liquidated damages, and subcontractor negotiations     $ 20,000   $ 179,000 $ 61,000      
Energy & Chemicals                  
Quarterly Data                  
Allowance for credit loss   $ 55,000