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Accounts Payable And Accrued Expenses - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012
Accounts Payable and Accrued Expenses [Line Items]
Sales tax liability	$ 3.3

Carrying value as of the balance sheet date of liabilities incurred through that date and payable for statutory sales and use taxes, including value added tax. 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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