Goodwill and Intangible Assets - Additional Information (Detail) (USD $)	3 Months Ended						9 Months Ended			12 Months Ended
	Sep. 30, 2013 Segment	Dec. 31, 2012		Sep. 30, 2012		Jun. 30, 2012	Sep. 30, 2013	Sep. 30, 2012		Dec. 31, 2012		Dec. 31, 2011
Goodwill And Intangible Assets Disclosure [Line Items]
Gross amount of goodwill	$ 72,400,000	$ 72,400,000					$ 72,400,000			$ 72,400,000
Accumulated goodwill impairment	49,700,000	27,100,000					49,700,000			27,100,000
Adjusted goodwill in connection with its acquisition										300,000
Goodwill	22,723,000	45,270,000	[1]				22,723,000			45,270,000	[1]	59,044,000
Impairment of goodwill	22,622,000			4,979,000	[2]		22,622,000	26,429,000	[2]	27,084,000
Goodwill Impaired Accumulated Impairment Loss During Year		700,000		5,000,000		21,400,000				27,100,000
Percentage of discount rate		50.00%								50.00%
Impairment of long-lived assets	325,000			870,000	[2]	23,900,000	325,000	24,785,000	[2]	24,785,000
Number of operating units	6
Identity Management
Goodwill And Intangible Assets Disclosure [Line Items]
Goodwill	21,476,000	44,037,000					21,476,000			44,037,000		49,478,000
Impairment of goodwill							22,622,000			18,712,000
Number of operating units	4
ID Products
Goodwill And Intangible Assets Disclosure [Line Items]
Goodwill	1,247,000	1,233,000					1,247,000			1,233,000		9,566,000
Impairment of goodwill										8,372,000
Number of operating units	2
Minimum
Goodwill And Intangible Assets Disclosure [Line Items]
Percentage of discount rate		16.00%								16.00%
Maximum
Goodwill And Intangible Assets Disclosure [Line Items]
Percentage of discount rate		20.00%								20.00%
Acquired
Goodwill And Intangible Assets Disclosure [Line Items]
Goodwill		13,000,000								13,000,000
Order Backlog
Goodwill And Intangible Assets Disclosure [Line Items]
Impairment of long-lived assets	100,000						100,000
Indefinite lived intangible assets, impairment							$ 10,600,000

[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.