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Capital Stock - Common Stock and Treasury Stock Activity (Detail) - shares
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Common shares    
Balance at the beginning of the year 158,140,128 166,667,936
Stock plan shares issued 3,249,892 2,877,761
Shares surrendered by optionees (392,921) (288,797)
Common stock repurchases (1,091,067) (11,116,772)
Balance at the end of the year 159,906,032 158,140,128
Treasury shares    
Balance at the beginning of the year 13,809,889 2,404,320
Stock plan shares issued 0 0
Shares surrendered by optionees 392,921 288,797
Common stock repurchases 1,091,067 11,116,772
Balance at the end of the year 15,293,877 13,809,889