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Acquisitions - Additional Information (Detail) - USD ($)
 12 Months Ended
Nov. 16, 2016
Oct. 31, 2016
Jul. 27, 2015
May 28, 2014
Dec. 31, 2016
Jan. 02, 2016
Jan. 03, 2015
Business Acquisition [Line Items]              
Cash purchase price of acquisition         $ 160,400,000 $ 11,800,000 $ 41,300,000
Goodwill recorded on a preliminary basis         895,500,000 $ 790,100,000 $ 810,700,000
Ryeson Corporation [Member]              
Business Acquisition [Line Items]              
Preliminary cash purchase price of acquisition $ 12,900,000            
Cash purchase price of acquisition $ 12,500,000            
Goodwill recorded on a preliminary basis         3,200,000    
Goodwill expected tax deductible amount         0    
Ryeson Corporation [Member] | Trademarks [Member]              
Business Acquisition [Line Items]              
Non-amortized trademark         3,700,000    
Car-O-Liner Holding AB [Member]              
Business Acquisition [Line Items]              
Preliminary cash purchase price of acquisition   $ 151,800,000          
Cash purchase price of acquisition   147,900,000          
Goodwill recorded on a preliminary basis   $ 128,100,000     128,100,000    
Goodwill expected tax deductible amount         $ 0    
Ecotechnics S.p.A [Member]              
Business Acquisition [Line Items]              
Cash purchase price of acquisition     $ 11,800,000        
Pro-Cut International, Inc [Member]              
Business Acquisition [Line Items]              
Cash purchase price of acquisition       $ 41,300,000