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Patents and other intangible assets - Schedule of Patents and Other Intangibles Assets (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012
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Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |
Cost | $ 39,679 |  | $ 39,562
Accumulated amortization | (32,744) |  | (32,272)
Patents and other intangible assets, net | 6,935 | [1] | 7,290
Patents [Member] |  |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |
Cost | 39,000 |  | 38,905
Accumulated amortization | (32,292) |  | (31,845)
Trademarks - definite lived [Member] |  |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |
Cost | 679 |  | 657
Accumulated amortization | $ (452) |  | $ (427)
[1] | Unaudited

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