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Net Income Per Common Share - Narrative (Detail)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Net Income Per Common Share:    
Options to purchase common stock outstanding that would be considered anti-dilutive 2.3us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 3.2us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount