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Earnings Per Common Share - Options to Purchase Shares of Common Stock (Detail)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Earnings Per Share [Abstract]        
Number of antidilutive options and awards 1.7 2.8 1.7 3.3