Intangible Assets - Summary of Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Less: accumulated amortization	$ (53,628)	$ (53,860)
Intangible assets, net	2,422	2,451
Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross	19,580	19,683
Customer relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross	28,120	28,269
Intellectual property assets [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross	$ 8,350	$ 8,359

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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- Definition

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

+ References

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- Definition

Carrying amount of finite-lived intangible assets, indefinite-lived intangible assets and goodwill. Goodwill is an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. Intangible assets are assets, not including financial assets, lacking physical substance.

+ References

No definition available.

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