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Inventory Stated at Lower of Cost (First- in, First- out) or Market (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Schedule of Inventory [Line Items]    
Raw materials $ 4,983 $ 2,428
Finished goods 55,815 44,591
Inventory $ 60,798 $ 47,019 [1]
[1] Derived from audited financial statements