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Common Stock - Common Stock and Treasury Stock Activity (Detail) - shares
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Common shares    
Balance at the beginning of the year 138,660,154 139,555,487
Stock plan shares issued 1,250,550 2,175,510
Shares surrendered by optionees (144,280) (159,089)
Common stock repurchases (4,702,128) (2,911,754)
Balance at the end of the year 135,064,296 138,660,154
Treasury shares    
Balance at the beginning of the year 45,406,158 42,335,315
Shares surrendered by optionees 144,280 159,089
Common stock repurchases 4,702,128 2,911,754
Balance at the end of the year 50,252,566 45,406,158