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Patents - Schedule of Patents (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]    
Net Book Value $ 123,351 $ 155,213
Patents [Member]    
Finite-Lived Intangible Assets [Line Items]    
Cost 345,603 357,059
Accumulated Amortization 222,252 201,846
Net Book Value $ 123,351 $ 155,213