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Common Stock - Common Stock and Treasury Stock Activity (Detail) - shares
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Common shares    
Balance at the beginning of the year 135,064,296 138,660,154
Stock plan shares issued 856,175 1,250,550
Shares surrendered by optionees (316,450) (144,280)
Common stock repurchases (7,563,462) (4,702,128)
Balance at the end of the year 128,040,559 135,064,296
Treasury shares    
Balance at the beginning of the year 50,252,566 45,406,158
Shares surrendered by optionees 316,450 144,280
Common stock repurchases 7,563,462 4,702,128
Balance at the end of the year 58,132,478 50,252,566