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Restructuring - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015 People	Mar. 31, 2014
Reorganizations [Abstract]
Restructuring charges	$ 788us-gaap_RestructuringCharges	$ 747us-gaap_RestructuringCharges
Approximate number of workforce reduction from the company's headcount	120us-gaap_RestructuringAndRelatedCostNumberOfPositionsEliminated

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- Definition

The number of positions eliminated during the period as a result of restructuring activities.

+ References

No definition available.

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- Definition

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

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-Name Accounting Standards Codification

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Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 5

-Section P

-Subsection 3, 4

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