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Inventory Stated at Lower of Cost (First- in, First- out) or Market (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Schedule of Inventory [Line Items]    
Raw materials $ 3,716 $ 3,296
Finished goods 48,336 56,394
Inventory $ 52,052 $ 59,690 [1]
[1] Derived from audited financial statements