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Business Combinations - 2018 Acquisitions (Details)
$ in Thousands
3 Months Ended 4 Months Ended 9 Months Ended
Jun. 01, 2018
USD ($)
segment
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2018
USD ($)
segment
Sep. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Business combinations              
Net cash paid         $ 111,030 $ 66,205  
Fair value of net assets acquired              
Goodwill   $ 208,130   $ 208,130 $ 208,130   $ 153,374
Number of reportable segments | segment         5    
Revenue   908,902     $ 2,061,808    
Gross profit   106,505 $ 70,421   222,484 209,957  
Acquisition and related costs   3,827 238   13,190 1,555  
Power              
Fair value of net assets acquired              
Goodwill   32,036   32,036 32,036   24,391
Revenue   181,822     515,378    
Gross profit   32,077 18,842   76,674 52,498  
Pipeline              
Fair value of net assets acquired              
Goodwill   55,091   55,091 55,091   $ 51,521
Revenue   213,073     361,261    
Gross profit   24,999 $ 12,084   43,568 $ 79,575  
Transmission              
Fair value of net assets acquired              
Goodwill   43,541   43,541 43,541    
Revenue   121,526     163,980    
Gross profit   13,958     19,679    
Willbros Group, Inc              
Business combinations              
Increase in contract liabilities   16,700          
Decrease in lease obligations   (8,000)          
Increase in goodwill   11,100          
Total purchase consideration $ 164,758            
Less cash and restricted cash acquired (53,728)            
Net cash paid 111,030            
Fair value of net assets acquired              
Cash and restricted cash 53,728            
Accounts receivable 102,719            
Contract assets 30,762            
Other current assets 17,914            
Property, plant and equipment 31,286            
Deferred income taxes 27,014            
Other non-current assets 2,261            
Accounts payable and accrued liabilities (116,321)            
Contract liabilities (61,004)            
Other non-current liabilities (27,657)            
Total identifiable net assets 110,002            
Goodwill $ 54,756            
Number of reportable segments | segment 2            
Restricted cash $ 40,200            
Revenue   175,800          
Gross profit   18,600          
Revenue since acquisition       236,800      
Gross profit since acquisition       $ 25,400      
Acquisition and related costs   $ 3,800     $ 13,100    
Willbros Group, Inc | Power              
Fair value of net assets acquired              
Goodwill 7,600            
Willbros Group, Inc | Pipeline              
Fair value of net assets acquired              
Goodwill 3,600            
Willbros Group, Inc | Transmission              
Business combinations              
Net cash paid 111,000            
Fair value of net assets acquired              
Goodwill 43,500            
Willbros Group, Inc | Customer relationships              
Fair value of net assets acquired              
Intangibles assets 47,500            
Willbros Group, Inc | Non-compete agreements              
Fair value of net assets acquired              
Intangibles assets 1,600            
Willbros Group, Inc | Tradename              
Fair value of net assets acquired              
Intangibles assets $ 200