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ACQUISITIONS (Narrative) (Detail)
$ in Thousands
12 Months Ended
Mar. 16, 2015
USD ($)
Dec. 31, 2015
USD ($)
NumberAcquisitions
Dec. 31, 2016
USD ($)
Dec. 31, 2014
USD ($)
Business Acquisition [Line Items]        
Number of Businesses Acquired | NumberAcquisitions   1    
Goodwill   $ 972,606 $ 951,057 $ 1,040,901
Commercial/Industrial        
Business Acquisition [Line Items]        
Goodwill   447,828 436,141 454,092
Power        
Business Acquisition [Line Items]        
Goodwill   187,175 $ 187,261 $ 187,725
2015 acquisitions [Member]        
Business Acquisition [Line Items]        
Accounts receivable   996    
Payments to acquire business   13,228    
Inventory   152    
Property, plant, and equipment   1,463    
Other current assets   155    
Intangible assets   7,700    
Current And non-current Liabilities   6    
Due to seller   1,470    
Assets Acquired and Liabilities Assumed, Net   8,990    
Goodwill   $ 4,238    
Bolts Metallizing Inc [Member] | Commercial/Industrial        
Business Acquisition [Line Items]        
Payments to acquire business $ 13,000      
Effective date of acquisition Mar. 16, 2015