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Summary of Operating Expense (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Component Of Other Income And Expense [Line Items]      
Selling $ 25,869 $ 23,318 $ 19,653
General and administrative 29,715 21,429 17,881
Research, product development and regulatory 20,750 18,041 12,635
Freight, delivery and warehousing 25,468 21,054 16,961
Operating expenses $ 101,802 $ 83,842 $ 67,130