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Stock-Based Compensation Plans - Restricted Stock and Restricted Stock Units Outstanding (Detail) (USD $)
3 Months Ended
Mar. 31, 2014
Equity Awards
 
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Outstanding, Beginning Balance 385,063
Shares granted to employees and directors 350,594
Vested (93,241)
Forfeited (1,418)
Outstanding, Ending Balance 640,998
Outstanding, Beginning Balance $ 68.24
Grant date fair value per unit $ 84.89
Vested $ 69.86
Forfeited $ 79.41
Outstanding, Ending Balance $ 77.09
Liability Awards
 
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Outstanding, Beginning Balance 389,013
Shares granted to employees and directors 77,435
Vested (77,142)
Forfeited (90)
Outstanding, Ending Balance 389,216
Outstanding, Beginning Balance $ 71.02
Grant date fair value per unit $ 84.98
Vested $ 69.55
Forfeited $ 71.03
Outstanding, Ending Balance $ 74.09