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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, 2012 | Dec. 31, 2011
--- | --- | ---
Finite And Indefinite Lived Intangible Assets [Line Items] |  |
Cost | $ 39,562 | $ 39,438
Accumulated amortization | (32,272) | (30,592)
Patents and other intangible assets, net | 7,290 | 8,846
Patents [Member] |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |
Cost | 38,905 | 38,893
Accumulated amortization | (31,845) | (30,211)
Trademarks - definite lived [Member] |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |
Cost | 657 | 545
Accumulated amortization | $ (427) | $ (381)

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