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Preferred Stock (Additional Information) (Detail) (USD $)
 1 Months Ended 3 Months Ended
Sep. 30, 2012
Aug. 31, 2012
Jul. 31, 2011
Sep. 30, 2012
Sep. 30, 2011
Class of Stock [Line Items]          
Purchases of Series A convertible preferred stock 992,014 2,179,900   3,171,914  
Purchases price of Series A convertible preferred stock, per share $ 8.97     $ 8.97  
Total consideration for purchases of Series A convertible preferred stock $ 108,000,000   $ 108,000,000 $ 108,000,000  
Consideration for purchases of Series A convertible preferred stock in cash         40,000,000
Issuance of convertible subordinated promissory notes in the aggregate principal amount     68,000,000    
Series A Preferred Stock [Member]
          
Class of Stock [Line Items]          
Purchases of Series A convertible preferred stock       12,041,700  
Consideration for purchases of Series A convertible preferred stock in cash       40,000,000  
Issuance of convertible subordinated promissory notes in the aggregate principal amount       $ 68,000,000