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Net Income (Loss) Per Share - Additional Information (Detail) (Stock Options [Member])
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Stock Options [Member]
       
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Weighted average diluted securities included in calculation of diluted net income per share 4.7      
Weighted average diluted securities excluded from diluted net loss per share   9.7 10.1 13.0