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Inventories - Summary of Inventories (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Inventory Disclosure [Abstract]    
Raw materials $ 26,803 $ 28,362
Work-in-process 3,210 2,707
Finished goods 6,378 6,535
Inventory, gross 36,391 37,604
Inventory reserves (7,723) (7,649)
Net balance $ 28,668 $ 29,955