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Patents and Other Intangible Assets - Schedule of Patents and Other Intangibles Assets (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Finite And Indefinite Lived Intangible Assets [Line Items]    
Cost $ 43,188 $ 39,562
Accumulated amortization (34,142) (32,272)
Patents and other intangible assets, net 9,046 7,290
Patents [Member]
   
Finite And Indefinite Lived Intangible Assets [Line Items]    
Cost 42,568 38,905
Accumulated amortization (33,688) (31,845)
Trademarks-definite lived [Member]
   
Finite And Indefinite Lived Intangible Assets [Line Items]    
Cost 620 657
Accumulated amortization $ (454) $ (427)