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Accrued Expenses/Accounts Payable - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2012
Sep. 30, 2011
Accrued Liabilities [Line Items]      
Write off of certain payables no longer valid due to the statue of limitations $ 490 $ 490 $ 0