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Accrued and Other Current Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Accounts Payable And Accrued Liabilities [Line Items]
Employee-related accrued expenses	$ 10,497	$ 12,293
Other accrued expenses	13,463	7,666
Accrued and other current liabilities	$ 23,960	$ 19,959

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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