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Inventories - Summary of Inventories (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Inventory, Net [Abstract]    
Raw materials $ 19,992 $ 19,753
Work in process 3,501 3,172
Finished goods 3,711 2,987
Obsolescence allowance (663) (536)
Inventory, net $ 26,541 $ 25,376