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Inventories - Summary of Inventories (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Inventory Net [Abstract]    
Raw materials $ 19,563 $ 19,753
Work in process 2,795 3,172
Finished goods 2,549 2,987
Obsolescence allowance (844) (536)
Inventory, net $ 24,063 $ 25,376