Fair Value Measurements - Additional Information (Detail) (USD $)	3 Months Ended				9 Months Ended			12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012		Jun. 30, 2012	Sep. 30, 2013	Sep. 30, 2012		Dec. 31, 2012
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Re-measurement of contingent consideration						$ (5,657,000)	[1]
Impairment of long-lived assets	325,000	870,000	[1]	23,900,000	325,000	24,785,000	[1]	24,785,000
Percentage of discount rate								50.00%
Minimum
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Percentage of discount rate								16.00%
Maximum
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Percentage of discount rate								20.00%
idOnDemand, Inc.
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Contingent consideration related to the acquisition	10,000,000				10,000,000
Re-measurement of contingent consideration						(5,463,000)
polyright SA
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Contingent consideration related to the acquisition								300,000
Re-measurement of contingent consideration						$ (194,000)

[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.