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Stock-Based Compensation Plans - Restricted Stock and Restricted Stock Units Outstanding (Detail) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Equity Awards
     
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Outstanding, Beginning Balance 349,156 221,609  
Granted 402,053 364,082 331,209
Vested (315,535) (208,802) (88,854)
Forfeited (50,611) (27,733) (20,746)
Outstanding, Ending Balance 385,063 349,156 221,609
Outstanding, Beginning Balance $ 59.08 $ 49.64  
Weighted average grant date fair value $ 71.26 $ 63.44 $ 49.56
Vested $ 62.43 $ 56.73 $ 49.37
Forfeited $ 65.29 $ 58.65 $ 49.45
Outstanding, Ending Balance $ 68.24 $ 59.08 $ 49.64
Liability Awards
     
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Outstanding, Beginning Balance 423,478 487,244 582,751
Granted 424,809 380,808 352,419
Vested (437,570) (438,283) (418,634)
Forfeited (21,704) (6,291) (29,292)
Outstanding, Ending Balance 389,013 423,478 487,244
Outstanding, Beginning Balance $ 58.91 $ 48.76 $ 44.81
Weighted average grant date fair value $ 75.53 $ 64.06 $ 51.17
Vested $ 64.36 $ 52.17 $ 45.55
Forfeited $ 57.31 $ 54.54 $ 45.04
Outstanding, Ending Balance $ 71.02 $ 58.91 $ 48.76