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Inventories - Inventories (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Inventory Disclosure [Abstract]    
Raw materials $ 12,837 $ 12,667
Work-in-process 3,947 4,193
Finished goods 9,869 9,322
Inventories $ 26,653 $ 26,182