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Common Stock and Treasury Stock Activity (Detail)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Common shares    
Balance at the beginning of the year 163,855,647 156,008,132
Stock plan shares issued 4,516,507 8,544,260
Shares surrendered by optionees (296,100) (342,498)
Common stock repurchases (1,408,118) (354,247)
Balance at the end of the year 166,667,936 163,855,647
Treasury shares    
Balance at the beginning of the year 700,102 3,357
Stock plan shares issued      
Shares surrendered by optionees 296,100 342,498
Common stock repurchases 1,408,118 354,247
Balance at the end of the year 2,404,320 700,102