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Business Combinations - 2018 Acquisitions (Details)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Jun. 01, 2018
USD ($)
segment
Jun. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
segment
Jun. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Business combinations              
Net cash paid         $ 111,030 $ 66,205  
Fair value of net assets acquired              
Goodwill   $ 197,071 $ 197,071   $ 197,071   $ 153,374
Number of reportable segments | segment         5    
Revenue     648,787   $ 1,152,906    
Gross profit     71,419 $ 84,483 115,979 139,536  
Acquisition and related costs     7,668 1,096 9,363 1,317  
Power              
Fair value of net assets acquired              
Goodwill   30,492 30,492   30,492   24,391
Revenue     167,001   333,556    
Gross profit     20,526 18,132 44,597 33,656  
Pipeline              
Fair value of net assets acquired              
Goodwill   54,370 54,370   54,370   $ 51,521
Revenue     90,605   148,188    
Gross profit     10,678 $ 39,366 18,569 $ 67,491  
Transmission              
Fair value of net assets acquired              
Goodwill   34,747 34,747   34,747    
Revenue     42,454   42,454    
Gross profit     5,721   5,721    
Willbros Group, Inc              
Business combinations              
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 18,767            
Property, plant and equipment 33,171            
Deferred income taxes 22,466            
Other non-current assets 2,261            
Accounts payable and accrued liabilities (117,736)            
Contract liabilities (44,258)            
Other non-current liabilities (35,269)            
Total identifiable net assets 121,061            
Goodwill $ 43,697            
Number of reportable segments | segment 3            
Revenue since acquisition   61,000          
Gross profit since acquisition   $ 6,400          
Acquisition and related costs     $ 7,700   $ 9,300    
Willbros Group, Inc | Power              
Fair value of net assets acquired              
Goodwill $ 6,100            
Willbros Group, Inc | Pipeline              
Fair value of net assets acquired              
Goodwill 2,800            
Willbros Group, Inc | Transmission              
Business combinations              
Net cash paid 111,000            
Fair value of net assets acquired              
Goodwill 34,700            
Willbros Group, Inc | Customer relationships              
Fair value of net assets acquired              
Intangibles assets 52,650            
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