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Subsequent Event - Additional Information (Detail) (USD $)
9 Months Ended 272 Months Ended 1 Months Ended
Sep. 30, 2013
Sep. 30, 2013
Sep. 30, 2013
Principal stockholder
Amended Agreement
Oct. 31, 2013
Subsequent Event
Principal stockholder
Oct. 31, 2013
Subsequent Event
Principal stockholder
Amended Agreement
Subsequent Event [Line Items]          
Proceeds from exercise warrants $ 49,170,000 $ 49,170,000   $ 45,000,000  
Cancelled principal indebtedness         78,000,000
Extended maturity date of loan         Jan. 05, 2020
Loan agreement with related party     350,000,000   370,000,000
Accrued interest that became due and payable upon cancellation of the of principal indebtedness, to be capitalized         $ 7,900,000