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Inventories - Components of Inventories (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Inventory Disclosure [Abstract]    
Raw materials and component parts $ 139,522 $ 133,470
Work in process 43,400 41,895
Finished goods 61,253 55,602
Total $ 244,175 $ 230,967