Summary of Contingent Consideration by Acquisition (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2012
Business Acquisition Contingent Consideration [Line Items]
Amount paid	$ (108)	$ (108)
Re-measurement of contingent consideration		(5,657)	[1]
idOnDemand, Inc.
Business Acquisition Contingent Consideration [Line Items]
Amount paid
Re-measurement of contingent consideration		(5,463)
polyright SA
Business Acquisition Contingent Consideration [Line Items]
Amount paid	(108)	(108)
Re-measurement of contingent consideration		$ (194)

[1] Certain amounts shown in the table above have changed as compared to amounts reported in prior periods as noted in Item 1, Financial Statements, Note 1 of Notes to Condensed Consolidated Financial Statements, Reclassifications and Restatements.