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Summary of Significant Accounting Policies - Revenue Recognition (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
USD ($)
pool
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
pool
Sep. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Revenue Recognition [Line Items]                    
ASU, credit loss     us-gaap:AccountingStandardsUpdate201613Member              
Revenues recognized related to change orders and claims $ 144,500   $ 144,500       $ 170,000      
Change in contract estimates, favorable (unfavorable) impact on operating results, amount $ 48,700 $ 29,200                
Change in contract estimates, favorable (unfavorable) impact on operating results, percent (less than for quarter-to-date and year to date 2020 and year-to-date 2019) 9.60% 6.20% 5.00% 5.00%            
Percent of total revenues recognized associated with revenue recognition method 47.90% 51.30% 48.40% 50.80%            
Revenue, related to performance obligation satisfied in previous periods     $ 85,200              
Revenue recognized related to amounts in contract liabilities outstanding at the beginning of period     426,500              
Stockholders' equity $ 4,155,566 $ 3,909,207 4,155,566 $ 3,909,207 $ 3,918,002 $ 3,795,178 4,053,831 $ 3,776,259 $ 3,725,057 $ 3,605,453
Allowances on accounts receivable, current 16,404   16,404       9,398      
Deferred income taxes $ (206,280)   $ (206,280)       (214,779)      
Number of pools used for the purpose of calculating its historical credit loss experience | pool 1   1              
Long-term accounts receivable $ 12,600   $ 12,600       12,600      
Current retainage balances 340,500   340,500       299,600      
Non-current retainage balances 60,600   60,600       54,200      
Unbilled receivables 721,400   721,400       524,300      
Latin America                    
Revenue Recognition [Line Items]                    
Change in contract estimates, favorable (unfavorable) impact on operating results, amount $ (12,100)   $ (28,600)              
Percentage of project completion 80.00%   80.00%              
Accounts Payable and Accrued Expenses                    
Revenue Recognition [Line Items]                    
Unearned revenues $ 36,000   $ 36,000       33,200      
Retained Earnings                    
Revenue Recognition [Line Items]                    
Stockholders' equity 3,103,849 2,743,498 3,103,849 2,743,498 $ 2,948,180 $ 2,881,416 2,854,271 $ 2,612,994 $ 2,591,883 $ 2,477,291
Adjustment due to Adoption of New ASU                    
Revenue Recognition [Line Items]                    
Stockholders' equity             (3,841)      
Allowances on accounts receivable, current             5,100      
Deferred income taxes             1,200      
Adjustment due to Adoption of New ASU | Retained Earnings                    
Revenue Recognition [Line Items]                    
Stockholders' equity             $ (3,841)      
Pipeline Transmission Project - Canada - Project                    
Revenue Recognition [Line Items]                    
Estimated cost to complete 7,800   7,800              
Larger Pipeline Transmission Project                    
Revenue Recognition [Line Items]                    
Change in contract estimates, favorable (unfavorable) impact on operating results, amount 32,900   15,100              
Pipeline Transmission Project - United States                    
Revenue Recognition [Line Items]                    
Change in contract estimates, favorable (unfavorable) impact on operating results, amount   22,200   21,600            
Electric Transmission Project - Southern California                    
Revenue Recognition [Line Items]                    
Change in contract estimates, favorable (unfavorable) impact on operating results, amount   $ (11,000)   (20,400)            
Contract value $ 404,300   $ 404,300              
Percentage of project completion 93.00%   93.00%              
EPC Electric Transmission Project                    
Revenue Recognition [Line Items]                    
Change in contract estimates, favorable (unfavorable) impact on operating results, amount       30,100            
Processing Facility Construction Project - Texas                    
Revenue Recognition [Line Items]                    
Change in contract estimates, favorable (unfavorable) impact on operating results, amount       $ (24,300)