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Operating Information by Segment and Geographic Area - Narrative (Details)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
USD ($)
Sep. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Sep. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2020
USD ($)
project
Dec. 31, 2019
USD ($)
project
subcontract
$ / shares
Dec. 31, 2018
USD ($)
$ / shares
Segment Reporting Information [Line Items]                      
Charges from write-off of pre-contract costs             $ 26,000        
Charges from write-off of embedded foreign currency derivatives                   $ 26,000  
Charges from write-off of embedded foreign currency derivatives (in dollars per share) | $ / shares                   $ 0.19  
Effect of forecast revision on estimated project cost           $ 59,000          
Gain (loss) on sale of interest in joint venture (in dollars per share) | $ / shares                     $ 0.74
Gains related to favorable dispute resolution           18,000 13,000        
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
North America                      
Segment Reporting Information [Line Items]                      
Revenue                 9,806,400 $ 8,439,700 8,982,100
Energy & Chemicals                      
Segment Reporting Information [Line Items]                      
Recognition of reserves for expected credit losses                 60,000    
Effect on segment profit                     $ 40,000
Effect on segment profit (in dollars per share) | $ / shares                     $ 0.23
Number of projects | project                   2  
Change in cost and schedule impacts                   $ 87,000 $ 133,000
Change in cost and schedule impacts (in dollars per share) | $ / shares                   $ 0.62 $ 0.89
Energy & Chemicals | Forecast revisions resulting from late design changes, schedule-driven cost growth, and subcontractor negotiations | North America                      
Segment Reporting Information [Line Items]                      
Pre-tax charges associated with forecast revisions                   $ 260,000  
Pre-tax charges adversely affecting earnings before taxes (in dollars per share) | $ / shares                   $ 1.85  
Energy & Chemicals | Write-off of pre-contract costs                      
Segment Reporting Information [Line Items]                      
Charges from write-off of pre-contract costs                   $ 26,000  
Charges from write-off of pre-contract costs (in dollars per share) | $ / shares                   $ 190,000  
Energy & Chemicals | Close-out matters                      
Segment Reporting Information [Line Items]                      
Pre-tax charges associated with forecast revisions                   $ 31,000  
Pre-tax charges adversely affecting earnings before taxes (in dollars per share) | $ / shares                   $ 0.22  
Mining & Industrial                      
Segment Reporting Information [Line Items]                      
Gains related to favorable dispute resolution                   $ (31,000)  
Gains related to favorable dispute resolution (in dollars per share) | $ / shares                   $ 0.16  
Infrastructure & Power                      
Segment Reporting Information [Line Items]                      
Number of projects | project                   3  
Infrastructure & Power | Settlement of client disputes as well as cost growth related to close-out matters                      
Segment Reporting Information [Line Items]                      
Effect of forecast revision on estimated project cost                   $ 135,000  
Effect of forecast revision on estimated project cost (in dollars per share) | $ / shares                   $ 0.96  
Gain (loss) on sale of interest in joint venture                     $ 125,000
Infrastructure & Power | Late engineering changes                      
Segment Reporting Information [Line Items]                      
Effect of forecast revision on estimated project cost                   $ 133,000  
Effect of forecast revision on estimated project cost (in dollars per share) | $ / shares                   $ 0.95  
Infrastructure & Power | Estimated cost growth                      
Segment Reporting Information [Line Items]                      
Effect of forecast revision on estimated project cost                     $ 188,000
Effect of forecast revision on estimated project cost (in dollars per share) | $ / shares                     $ 1.02
Government | South Carolina and Georgia                      
Segment Reporting Information [Line Items]                      
Number of subcontracts cancelled | subcontract                   2  
Derecognition of accounts receivable                   $ 68,000  
Derecognition of revenue                   89,000  
Diversified Services                      
Segment Reporting Information [Line Items]                      
Revenue                 270,000 322,000 $ 332,000
Other | Warren project                      
Segment Reporting Information [Line Items]                      
Effect of forecast revision on estimated project cost                   $ 59,000  
Effect of forecast revision on estimated project cost (in dollars per share) | $ / shares                   $ 0.42  
Other | Radford project                      
Segment Reporting Information [Line Items]                      
Effect of forecast revision on estimated project cost                 $ 0 $ 83,000 $ 56,000
Effect of forecast revision on estimated project cost (in dollars per share) | $ / shares                   $ 0.59 $ 0.30
Pending litigation | Energy & Chemicals | Unapproved change orders                      
Segment Reporting Information [Line Items]                      
Number of projects | project                 2    
Unapproved change orders for cost growth and extension of time due to client delays 66,000               $ 66,000    
Estimate of possible loss $ 121,000               $ 121,000    
Customer concentration | Consolidated revenue | Government                      
Segment Reporting Information [Line Items]                      
Concentration risk (as a percentage)                 18.00% 15.00% 18.00%
Customer concentration | Single customer | Consolidated revenue | Energy & Chemicals                      
Segment Reporting Information [Line Items]                      
Concentration risk (as a percentage)                 12.00% 11.00% 18.00%
NuScale | Other                      
Segment Reporting Information [Line Items]                      
Research and development activities                 $ 84,000 $ 66,000 $ 74,000
Corporate general and administrative expense                      
Segment Reporting Information [Line Items]                      
Foreign currency exchange gains (losses)                 47,000 27,000 (33,000)
DOE | NuScale | Other                      
Segment Reporting Information [Line Items]                      
Net of qualified reimbursable expenses                 $ 71,000 $ 56,000 $ 62,000