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Business Combinations - Construction Segment (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Business Acquisition [Line Items]      
Goodwill $ 98,086 $ 61,178 $ 30,540
Construction | PDC Operations (Australia) Pty Ltd (PDC) and BDS VirCon (BDS)      
Business Acquisition [Line Items]      
Consideration paid 25,500    
Cash 21,400    
Goodwill 11,827    
Construction | PDC Operations (Australia) Pty Ltd (PDC) and BDS VirCon (BDS) | Assembled and Trained Workforce      
Business Acquisition [Line Items]      
Goodwill 2,900    
Construction | PDC Operations (Australia) Pty Ltd (PDC) and BDS VirCon (BDS) | Selling, General and Administrative Expenses      
Business Acquisition [Line Items]      
Acquisition costs $ 2,300