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Related Party Transactions Included in Consolidated Statements of Operations and Comprehensive Income (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Related Party Transaction [Line Items]    
Net Sales $ 204 $ 0
Cost of goods sold 160 0
Selling, general and administrative expenses 417 0
Interest expense $ 904 $ 0