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Net Income Attributable to Company Per Share - Additional Information (Detail) - shares
shares in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Earnings Per Share [Abstract]        
Anti-dilutive stock options outstanding 14 15 14 14