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Business Combinations - 2018 Acquisitions (Details)
$ in Thousands
3 Months Ended 7 Months Ended 12 Months Ended
Jul. 01, 2018
USD ($)
Jun. 01, 2018
USD ($)
segment
Dec. 31, 2018
USD ($)
Sep. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2018
USD ($)
segment
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Business combinations                            
Increase in goodwill                         $ 121  
Net cash paid                       $ 110,620 66,205 $ 10,997
Fair value of net assets acquired                            
Goodwill     $ 206,159       $ 153,374       $ 206,159 $ 206,159 153,374 127,226
Number of reportable segments | segment                       5    
Revenue     877,670 $ 908,902 $ 648,787 $ 504,119 579,017 $ 608,311 $ 631,165 $ 561,502   $ 2,939,478 2,379,995 1,996,948
Gross profit     103,253 $ 106,505 $ 71,419 $ 44,560 68,477 $ 70,421 $ 84,483 $ 55,053   325,737 278,434 201,307
Merger and related costs                       13,260 1,774 815
Power                            
Business combinations                            
Increase in goodwill                         121  
Fair value of net assets acquired                            
Goodwill     25,933       24,391       25,933 25,933 24,391 24,512
Revenue                       694,048 606,125 478,653
Gross profit                       109,789 65,675 49,807
Pipeline                            
Fair value of net assets acquired                            
Goodwill     52,285       $ 51,521       52,285 52,285 51,521 42,252
Revenue                       590,937 465,570 401,931
Gross profit                       66,602 $ 92,087 $ 68,100
Transmission                            
Fair value of net assets acquired                            
Goodwill     $ 50,479               50,479 50,479    
Revenue                     286,749 286,749    
Gross profit                     31,904      
Willbros Group, Inc                            
Business combinations                            
Increase in contract liabilities                       19,600    
Decrease in insurance liabilities                       (9,300)    
Decrease in lease obligations                       (8,000)    
Increase in goodwill                       9,100    
Total purchase consideration   $ 164,758                        
Less cash and restricted cash acquired   (54,138)                        
Net cash paid $ 110,600 110,620                        
Fair value of net assets acquired                            
Cash and restricted cash   54,138                        
Accounts receivable   102,719                        
Contract assets   30,762                        
Other current assets   18,712                        
Property, plant and equipment   30,522                        
Deferred income taxes   24,017                        
Other non-current assets   2,261                        
Accounts payable and accrued liabilities   (114,088)                        
Contract liabilities   (63,902)                        
Other non-current liabilities   (20,868)                        
Total identifiable net assets   111,973                        
Goodwill   $ 52,785                        
Number of reportable segments | segment   2                        
Restricted cash   $ 40,200                        
Revenue since acquisition                     400,800      
Gross profit since acquisition                     $ 39,500      
Merger and related costs                       $ 13,200    
Willbros Group, Inc | Power                            
Fair value of net assets acquired                            
Goodwill   1,500                        
Willbros Group, Inc | Pipeline                            
Fair value of net assets acquired                            
Goodwill   800                        
Willbros Group, Inc | Transmission                            
Business combinations                            
Net cash paid   110,600                        
Fair value of net assets acquired                            
Goodwill   50,500                        
Willbros Group, Inc | Customer relationships                            
Fair value of net assets acquired                            
Intangibles assets   47,500                        
Willbros Group, Inc | Tradename                            
Fair value of net assets acquired                            
Intangibles assets   $ 200