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Other Current and Non-Current Liabilities - Components of Other Current Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Other Liabilities Disclosure [Abstract]
Deferred revenue	$ 25,235	$ 23,271
VAT and sales tax payable	6,174	3,418
Other	17,225	13,701
Total other current liabilities	$ 48,634	$ 40,390

Aggregate carrying amount of current liabilities (due within one year or within the normal operating cycle if longer) not separately disclosed in the balance sheet. Includes costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered and of liabilities not separately disclosed.

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