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Earnings Per Share - Additional Information (Detail) (Stock Option and Restricted Stock)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Stock Option and Restricted Stock
       
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive stock equivalents excluded from computation of earnings per share (in shares) 0.8 6.2 0.9 6.2