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Stock-Based Compensation Plans - Restricted Stock and Restricted Stock Units Outstanding (Detail) (USD $)
6 Months Ended
Jun. 30, 2014
Equity Awards
 
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Outstanding, Beginning Balance 385,063
Granted 355,094
Vested (196,227)
Forfeited (16,005)
Outstanding, Ending Balance 527,925
Outstanding, Beginning Balance $ 68.24
Grant date fair value per unit $ 84.96
Vested $ 72.11
Forfeited $ 75.16
Outstanding, Ending Balance $ 77.84
Liability Awards
 
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Outstanding, Beginning Balance 389,013
Granted 268,385
Vested (203,227)
Forfeited (90)
Outstanding, Ending Balance 454,081
Outstanding, Beginning Balance $ 71.02
Grant date fair value per unit $ 87.54
Vested $ 75.81
Forfeited $ 71.03
Outstanding, Ending Balance $ 78.64