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Goodwill and Intangible Assets - Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2013 | Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets, Gross | $ 124,786 | $ 121,693
Accumulated Amortization | (111,150) | (110,716)
Foreign Currency Translation | 114 | 584
Intangible assets, net | 13,750 | 11,561
Completed technology [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets, Gross | 84,579 | 82,084
Accumulated Amortization | (77,391) | (77,243)
Foreign Currency Translation | (8) | 254
Intangible assets, net | 7,180 | 5,095
Customer relationships [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets, Gross | 14,571 | 14,571
Accumulated Amortization | (9,125) | (8,886)
Foreign Currency Translation | 109 | 312
Intangible assets, net | 5,555 | 5,997
Patents, trademarks, trade names and other [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets, Gross | 25,636 | 25,038
Accumulated Amortization | (24,634) | (24,587)
Foreign Currency Translation | 13 | 18
Intangible assets, net | $ 1,015 | $ 469

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