Fair Value Measurements - Additional Information (Detail) (USD $)	Jun. 30, 2012	Dec. 31, 2011		Jul. 18, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration for earn-out liability recognized	$ 100,000	$ 5,800,000
Long-term earn-out liability	899,000	629,000	[1]
polyright SA
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration for earn-out liability recognized	100,000			300,000
Contingent consideration included in other accrued expenses and liabilities	100,000	100,000
idOnDemand, Inc.
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term earn-out liability		$ 5,500,000

[1] The condensed consolidated balance sheet has been derived from the audited consolidated financial statements at December 31, 2011 but does not include all the information and footnotes required by U.S. generally accepted accounting principles for complete financial statements.