XML 148 R82.htm IDEA: XBRL DOCUMENT v3.19.3.a.u2
Capital Stock - Common Stock and Treasury Stock Activity (Detail) - shares
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Common shares    
Balance at the beginning of the year 140,498,981 151,906,797
Stock plan shares issued 1,281,198 822,878
Shares surrendered by optionees (185,141) (230,550)
Common stock repurchases (2,039,551) (12,000,144)
Balance at the end of the year 139,555,487 140,498,981
Treasury shares    
Balance at the beginning of the year 40,110,623 27,879,929
Shares surrendered by optionees 185,141 230,550
Common stock repurchases 2,039,551 12,000,144
Balance at the end of the year 42,335,315 40,110,623