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Accrued Expenses - Components of Accrued Expenses (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Payables And Accruals [Abstract]
Payroll and payroll related	$ 5,768	$ 3,800
Licensed software and maintenance	1,197	1,627
Marketing programs	3,709	1,197
Other accrued expenses	5,489	4,179
Accrued expenses, total	$ 16,163	$ 10,803

Carrying value as of the balance sheet date of obligations incurred through that date and payable arising from transactions not otherwise specified in the taxonomy. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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