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ACQUISITIONS - Narrative (Details) - USD ($)
$ in Thousands
1 Months Ended
Jul. 31, 2017
Jun. 30, 2016
Apr. 30, 2016
Sep. 30, 2017
Dec. 31, 2016
May 31, 2016
Acquisitions            
Goodwill       $ 336,754 $ 321,110  
Ownership percentage by noncontrolling owners           10.00%
IGC Galvanizing Industries (M) Sdn Bhd            
Acquisitions            
Consideration transfered     $ 5,841      
Percentage acquired     30.00%      
Valmont SM            
Acquisitions            
Consideration transfered   $ 5,168        
Percentage acquired       5.20%    
Aircon            
Acquisitions            
Consideration transfered $ 5,362          
Annual revenue of acquiree 10,000          
Goodwill $ 3,327          
Customer relationships and other intangible assets       $ 2,109