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Earnings Per Share - Additional Information (Detail) - shares
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Oct. 31, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Common stock shares included in the calculation of EPS 185,000,000 182,471,195 184,000,000 182,471,195  
Common stock shares issued         0
Common stock shares outstanding         0
Employee Stock Options and Stock Awards [Member]          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Number of options outstanding 5,000,000   5,000,000    
Number of anti-dilutive securities 2,000,000   3,000,000