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Earnings Per Common Share - Additional Information (Detail) - shares
shares in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Earnings Per Share [Abstract]        
Antidilutive securities excluded from computation of earnings per share 1.5 1.7 1.9 2.1