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Acquisitions & Dispositions - Purchase Price Allocation (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Business Acquisition [Line Items]    
Goodwill $ 13,153 $ 297,906
Nestor Sales LLC [Member]    
Business Acquisition [Line Items]    
Purchase price, net of cash acquired 39,983  
Accounts receivable (9,230)  
Inventories (12,067)  
Other current assets (339)  
Property, plant and equipment, net (1,251)  
Other assets (752)  
Intangible assets (16,930)  
Total assets acquired (40,569)  
Accounts payable 4,992  
Accrued liabilities 1,943  
Deferred income taxes 3,287  
Other long-term liabilities 76  
Total liabilities assumed 10,298  
Goodwill $ 9,712