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Inventories - Summary of Inventories (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Inventory Disclosure [Abstract]    
Raw materials $ 10,585 $ 11,938
Work-in-process (materials, labor and overhead) 8,249 9,831
Finished goods (materials, labor and overhead) 4,691 5,870
Total inventories $ 23,525 $ 27,639