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Net Income Attributable to Company Per Share - Additional Information (Detail) - shares
shares in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Earnings Per Share [Abstract]        
Anti-dilutive stock options outstanding 14 9 14 9