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Nature of Business (Details)
$ in Thousands
12 Months Ended
Jun. 01, 2018
USD ($)
segment
Jun. 16, 2017
USD ($)
May 30, 2017
USD ($)
May 26, 2017
USD ($)
Dec. 31, 2019
USD ($)
segment
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Nature of Business              
Number of reportable segments | segment         5    
Purchase consideration, net of cash acquired           $ 110,620 $ 66,205
Average project size         $ 5,000    
Willbros              
Nature of Business              
Number of reportable segments | segment 2            
Purchase consideration, net of cash acquired $ 110,620            
Total purchase consideration 164,758            
Transmission | Willbros              
Nature of Business              
Purchase consideration, net of cash acquired $ 110,600            
Utilities | FGC              
Nature of Business              
Total purchase consideration       $ 37,700      
Pipeline | Coastal              
Nature of Business              
Total purchase consideration   $ 27,500          
Power | Engineering Assets              
Nature of Business              
Total purchase consideration     $ 2,300        
Carlsbad              
Nature of Business              
Ownership percentage         50.00%    
Wilmington              
Nature of Business              
Ownership percentage         50.00%