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Stockholders' Equity - Additional Information (Detail)
9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Stockholders' Equity    
Shares of common stock, authorized (shares) 600,000,000  
Shares of common stock, issued and sold (shares) 147,433,125  
Common Stock [Member]
   
Stockholders' Equity    
Stock Issued During Period, Shares, New Issues 7,078,520 12,369,068