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Taxes - Additional Information (Detail) (USD $)	3 Months Ended
Taxes - Additional Information (Detail) (USD $)	Mar. 31, 2013	Mar. 31, 2012
Operating Loss Carryforwards [Line Items]
Tax windfall benefit from settlement of employee stock based awards	$ 8,200,000
Effective income tax rate	58.10%	48.90%
(Benefit from) provision for income taxes	(3,115,000)	1,629,000
Research and experimentation tax credit carryforwards	3,700,000
Deferred tax liability for undistributed earnings	2,900,000
United States [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	88,200,000
Foreign [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	$ 19,400,000

Amount of deferred tax liability attributable to taxable temporary differences from undistributed earnings of subsidiaries and other recognized entities not within the country of domicile of the entity.

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- Definition

A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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- Definition

The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations.

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