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Stock-Based Compensation Plans - Restricted Stock and Restricted Stock Units Outstanding (Detail) (USD $)
9 Months Ended
Sep. 30, 2013
Equity Awards
 
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Outstanding, Beginning Balance 349,156
Granted 394,053
Vested (235,580)
Forfeited (45,589)
Outstanding, Ending Balance 462,040
Outstanding, Beginning Balance $ 59.08
Granted $ 71.13
Vested $ 62.30
Forfeited $ 65.32
Outstanding, Ending Balance $ 67.11
Liability Awards
 
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Outstanding, Beginning Balance 423,478
Granted 424,624
Vested (267,621)
Forfeited (21,704)
Outstanding, Ending Balance 558,777
Outstanding, Beginning Balance $ 58.91
Granted $ 75.53
Vested $ 62.07
Forfeited $ 57.31
Outstanding, Ending Balance $ 70.09