XML 90 R76.htm IDEA: XBRL DOCUMENT v3.10.0.1
Capital Stock - Common Stock and Treasury Stock Activity (Detail) - shares
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Common shares    
Balance at the beginning of the year 151,906,797 153,412,050
Stock plan shares issued 822,878 2,068,746
Shares surrendered by optionees (230,550) (180,537)
Common stock repurchases (12,000,144) (3,393,462)
Balance at the end of the year 140,498,981 151,906,797
Treasury shares    
Balance at the beginning of the year 27,879,929 24,305,930
Stock plan shares issued
Shares surrendered by optionees 230,550 180,537
Common stock repurchases 12,000,144 3,393,462
Balance at the end of the year 40,110,623 27,879,929