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Subsequent Events - Additional Information (Detail) (Subsequent Event [Member])
 9 Months Ended
Sep. 30, 2013
Subsequent Event [Member]
  
Subsequent Event [Line Items]  
Date of Plan Approval for delisting of Common Stock Nov. 04, 2013
Effective duration from filing date for delisting of common stock 10 days
Effective duration of termination of registration of commons stock 90 days