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Acquisitions - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended
Nov. 01, 2016
Mar. 03, 2016
Mar. 31, 2017
Mar. 31, 2016
ASW Steel Inc [Member]        
Business Acquisition [Line Items]        
Total base purchase price $ 3,500      
Purchase price in the form of cash 3,500      
Business acquisition, net sales     $ 13,323  
Business acquisition, income before income taxes     161  
Total purchase price 13,116      
Outstanding indebtedness $ 9,616      
Akers AB [Member]        
Business Acquisition [Line Items]        
Business acquisition, equity interest acquired   100.00%    
Total base purchase price   $ 74,155    
Purchase price in the form of cash   29,399    
Purchase price in the form of three-year promissory note   $ 22,619    
Purchase price in the form of shares   1,776,604    
Business acquisition, fair value   $ 22,137    
Debt, interest rate   6.50%    
Debt, maturity date   Mar. 03, 2019    
Business acquisition, net sales     31,890 $ 12,583
Business acquisition, income before income taxes     $ 668 $ 1,006
Akers AB [Member] | Chinese Joint Venture Company [Member]        
Business Acquisition [Line Items]        
Business acquisition, equity interest acquired   60.00%