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Computation of Weighted Average Shares Outstanding (Parenthetical) (Detail)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Earnings Per Share Disclosure [Line Items]  
Potentially dilutive share-based awards 8.3us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount