Goodwill by Segment and Changes in Carrying Amount of Goodwill (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended			9 Months Ended				12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012		Dec. 31, 2012
Goodwill [Line Items]
Beginning Balance				$ 45,270	[1]	$ 59,044		$ 59,044
Goodwill acquired during the period								12,958
Goodwill measurement period adjustment								297
Goodwill impairment during the period	(22,622)	(4,979)	[2]	(22,622)		(26,429)	[2]	(27,084)
Currency translation adjustment				75				55
Ending Balance	22,723			22,723				45,270	[1]
Identity Management
Goodwill [Line Items]
Beginning Balance				44,037		49,478		49,478
Goodwill acquired during the period								12,958
Goodwill measurement period adjustment								297
Goodwill impairment during the period				(22,622)				(18,712)
Currency translation adjustment				61				16
Ending Balance	21,476			21,476				44,037
ID Products
Goodwill [Line Items]
Beginning Balance				1,233		9,566		9,566
Goodwill impairment during the period								(8,372)
Currency translation adjustment				14				39
Ending Balance	$ 1,247			$ 1,247				$ 1,233

[1] The condensed consolidated balance sheet has been derived from the audited consolidated financial statements at December 31, 2012 but does not include all the information and footnotes required by U.S. generally accepted accounting principles for complete financial statements.

[2] 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.