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Related Party Transactions - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Related Party Transaction [Line Items]    
Related party purchases $ 1,172 $ 3,124
New Supplier Relationship [Member]
   
Related Party Transaction [Line Items]    
Related party purchases 1,089 3,085
IBP Holding Company [Member]
   
Related Party Transaction [Line Items]    
Receivable from IBP Holding Company $ 600