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Earnings Per Common Share - Options to Purchase Shares of Common Stock (Detail)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Earnings Per Share [Abstract]    
Number of antidilutive options and awards 1.7us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 1.7us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount