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Earnings 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
Sep. 30, 2013
Earnings Per Share [Abstract]        
Shares of common stock excluded from the calculation of diluted net income per share because of antidilutive effect 6.3 4.6 6.2 4.4