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Inventories - Summary of Inventories (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Inventory Disclosure [Abstract]    
Raw materials $ 75,423 $ 76,610
Work-in-process 20,485 19,708
Finished goods 41,098 38,321
Inventories $ 137,006 $ 134,639