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Earnings Per Share - Additional Information (Detail)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Nonqualified stock options and non-participating RSUs excluded from the calculation of diluted net income per common share 3.8 0.1