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Stock-Based Compensation Plans - SARs Activity (Detail) (USD $)
9 Months Ended
Sep. 30, 2013
Schedule Of Stock Option Activity [Line Items]  
Beginning Balance, Shares 3,433,362
Granted, Shares 470,617
Exercised, Shares (1,205,186)
Expired/forfeited, Shares (50,974)
Ending Balance, Shares 2,647,819
Beginning Balance, Weighted Average Exercise Price $ 52.52
Granted, Weighted Average Exercise Price $ 75.82
Exercised, Weighted Average Exercise Price $ 53.78
Expired/forfeited, Weighted Average Exercise Price $ 53.69
Ending Balance, Weighted Average Exercise Price $ 56.00