Quarterly report pursuant to Section 13 or 15(d)

Net Income (Loss) Per Share - Additional Information (Detail)

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Net Income (Loss) Per Share - Additional Information (Detail)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
class
Sep. 30, 2013
Earnings Per Share [Abstract]        
Total number of class of stock outstanding     2  
Common stock equivalents (shares) 3.1 3.5 3.2 3.1