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Prepaid Expenses and Other Current Assets - (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Prepaid Expense and Other Assets, Current [Abstract]
Founder's receivable	$ 0	$ 5,267
Other receivables	6,317	305
Other	7,279	4,311
Total prepaid expenses and other current assets	$ 13,596	$ 9,883

The total of the amounts paid in advance for capitalized costs that will be expensed with the passage of time or the occurrence of a triggering event, and will be charged against earnings within one year or the normal operating cycle, if longer, and the aggregate carrying amount of current assets, as of the balance sheet date, not separately presented elsewhere in the balance sheet. Current assets are expected to be realized or consumed within one year (or the normal operating cycle, if longer).

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