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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
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Finite And Indefinite Lived Intangible Assets [Line Items] |  |
Cost | $ 38,352 | $ 38,228
Accumulated amortization | (31,472) | (29,992)
Patents and other intangible assets, net | 6,880 | 8,236
Patents [Member] |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |
Cost | 37,695 | 37,683
Accumulated amortization | (31,045) | (29,611)
Trademarks - definite lived [Member] |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |
Cost | 657 | 545
Accumulated amortization | $ (427) | $ (381)

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