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Business Combinations - 2016 Combinations (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
May 30, 2017
Nov. 18, 2016
Jun. 24, 2016
Jan. 29, 2016
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Business combinations                  
Fair value of consideration $ 2,300                
Cash payment made 2,300                
Operating income         $ 38,506 $ 10,787 $ 53,705 $ 17,406  
Fixed assets 200                
Intangibles assets $ 2,100                
Goodwill         150,672   150,672   $ 127,226
Pipe Jacking Unlimited Inc | Vadnais                  
Business combinations                  
Purchase of property, plant and equipment     $ 13,400            
Mueller | Aevenia                  
Business combinations                  
Fair value of consideration       $ 4,100          
Fixed assets           2,000   2,000  
Goodwill           2,000   2,000  
Fair value of inventory acquired           $ 100   $ 100  
The period of time goodwill and/or other intangible assets are deductible for income tax purposes       15 years          
Northern | Aevenia                  
Business combinations                  
Fair value of consideration   $ 6,800              
Decrease to goodwill         (100)        
Fixed assets         100   100    
Intangibles assets         3,000   3,000    
Goodwill         $ 3,700   $ 3,700    
The period of time goodwill and/or other intangible assets are deductible for income tax purposes   15 years