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Earnings Per Share - Additional Information (Detail) - shares
shares in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Earnings Per Share [Abstract]      
Nonqualified stock options and non-participating RSUs excluded from the calculation of diluted net income per common share (in shares) 9.6 2.8 0.6