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Related Party Transactions - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Related Party Transaction [Line Items]        
Related party purchases $ 513 $ 2,908 $ 2,836 $ 9,622
Restricted Stock [Member]
       
Related Party Transaction [Line Items]        
Payment of director fees     50  
Cash Compensation [Member]
       
Related Party Transaction [Line Items]        
Payment of director fees     13  
IBP Holding Company [Member]
       
Related Party Transaction [Line Items]        
Receivable from IBP Holding Company 600   600  
New Supplier Relationship [Member]
       
Related Party Transaction [Line Items]        
Related party purchases $ 439 $ 2,845 $ 2,572 $ 9,504