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Net (Loss) Income Per Share - Additional Information (Detail)
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Earnings Per Share [Abstract]        
Common stock equivalents excluded from the calculation of diluted earnings per share due to decline in market price of stock 624,371 15,954 619,421 26,566