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Net Income (Loss) Per Share - Additional Information (Detail)
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Stock Option Activity And Changes [Line Items]    
Antidilutive securities excluded from computation of earnings per share, amount   71,961,723
Options
   
Stock Option Activity And Changes [Line Items]    
Antidilutive securities excluded from computation of earnings per share, amount 6,197,500 2,258,955