Goodwill and Intangible Assets - Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended	12 Months Ended
Sep. 30, 2013	Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross	$ 124,887	$ 121,693
Accumulated Amortization	(112,253)	(110,716)
Foreign Currency Translation	682	584
Intangible assets, net	13,316	11,561
Completed Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross	84,680	82,084
Accumulated Amortization	(77,823)	(77,243)
Foreign Currency Translation	369	254
Intangible assets, net	7,226	5,095
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross	14,571	14,571
Accumulated Amortization	(9,590)	(8,886)
Foreign Currency Translation	281	312
Intangible assets, net	5,262	5,997
Patents, Trademarks, Trade Names and Other [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross	25,636	25,038
Accumulated Amortization	(24,840)	(24,587)
Foreign Currency Translation	32	18
Intangible assets, net	$ 828	$ 469

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

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Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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- Definition

Amount of increase (decrease) to assets, excluding financial assets and goodwill, lacking physical substance with a finite life for foreign currency translation adjustments.

+ References

No definition available.

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