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Business Combinations - 2018 Acquisitions (Details)
$ in Thousands
3 Months Ended 7 Months Ended 12 Months Ended
Jun. 01, 2018
USD ($)
segment
Dec. 31, 2019
USD ($)
Sep. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Sep. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2019
USD ($)
segment
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Business combinations                          
Increase in goodwill                     $ 8,944    
Net cash paid                       $ 110,620 $ 66,205
Fair value of net assets acquired                          
Goodwill   $ 215,103       $ 206,159       $ 206,159 $ 215,103 206,159 153,374
Number of reportable segments | segment                     5    
Revenue   789,778 $ 865,064 $ 789,929 $ 661,558 877,670 $ 908,902 $ 648,787 $ 504,119   $ 3,106,329 2,939,478 2,379,995
Gross profit   89,514 $ 108,421 80,531 $ 52,460 103,253 $ 106,505 71,419 $ 44,560   330,926 325,737 278,434
Merger and related costs                       13,260 1,774
Transmission                          
Business combinations                          
Increase in goodwill                     8,553    
Fair value of net assets acquired                          
Goodwill   59,032       50,479       50,479 59,032 50,479  
Revenue                     497,302 286,749  
Gross profit                     22,580 31,904  
Power                          
Business combinations                          
Increase in goodwill                     261    
Fair value of net assets acquired                          
Goodwill   26,194       25,933       25,933 26,194 25,933 24,391
Revenue                     729,348 694,048 606,125
Gross profit                     76,119 109,789 65,675
Pipeline                          
Business combinations                          
Increase in goodwill                     130    
Fair value of net assets acquired                          
Goodwill   $ 52,415       $ 52,285       52,285 52,415 52,285 51,521
Revenue                     505,156 590,937 465,570
Gross profit                     61,550 66,602 $ 92,087
Willbros                          
Business combinations                          
Increase in contract liabilities       23,700                  
Decrease in lease obligations       (6,000)                  
Decrease in insurance liabilities       (11,900)                  
Decrease to intangible assets       (6,800)                  
Increase in goodwill       $ 18,000       $ 18,000          
Total purchase consideration $ 164,758                        
Less cash and restricted cash acquired (54,138)                        
Net cash paid 110,620                        
Fair value of net assets acquired                          
Cash and restricted cash 54,138                        
Accounts receivable 103,186                        
Contract assets 30,762                        
Other current assets 18,255                        
Property, plant and equipment 30,522                        
Deferred income taxes 27,954                        
Other non-current assets 2,261                        
Accounts payable and accrued liabilities (122,692)                        
Contract liabilities (68,104)                        
Other non-current liabilities (20,953)                        
Total identifiable net assets 103,029                        
Goodwill $ 61,729                        
Number of reportable segments | segment 2                        
Revenue                     702,400    
Gross profit                     $ 45,500    
Revenue since acquisition                   400,800      
Gross profit since acquisition                   $ 39,500      
Merger and related costs                       $ 13,200  
Willbros | Transmission                          
Business combinations                          
Net cash paid $ 110,600                        
Fair value of net assets acquired                          
Goodwill 59,000                        
Willbros | Power                          
Fair value of net assets acquired                          
Goodwill 1,800                        
Willbros | Pipeline                          
Fair value of net assets acquired                          
Goodwill 900                        
Willbros | Customer relationships                          
Fair value of net assets acquired                          
Intangibles assets 47,500                        
Willbros | Tradename                          
Fair value of net assets acquired                          
Intangibles assets $ 200