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Net Income Attributable to Company Per Share - Additional Information (Detail)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Earnings Per Share [Abstract]    
Anti-dilutive stock options outstanding 14us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 10us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount