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Inventories - Summary of Inventories (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Inventory Net [Abstract]    
Raw materials $ 19,353 $ 19,753
Work in process 3,657 3,172
Finished goods 2,472 2,987
Obsolescence allowance (714) (536)
Inventory, net $ 24,768 $ 25,376