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Inventories - Summary of Inventories (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Inventory Disclosure [Abstract]    
Raw materials $ 20,179 $ 19,744
Work-in-process 3,658 3,979
Finished goods 5,684 5,973
Net balance $ 29,521 $ 29,696