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Stock Option Activity and Related Information (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]      
Options, Outstanding at beginning of year 13,337 [1] 14,192 16,601
Options, Granted 2,955 2,125 2,139
Options, Exercised (1,944) (2,324) (4,062)
Options, Expired   (602) (470)
Options, Forfeited (900) (54) (16)
Options, Outstanding at December 31 13,448 13,337 [1] 14,192
Options, Exercisable at December 31 8,530 8,429 8,695
Weighted average exercise price, Outstanding at beginning of year $ 28.50 $ 23.85 $ 23.12
Weighted average exercise price, Granted $ 54.24 $ 52.92 $ 30.69
Weighted average exercise price, Exercised $ 21.80 $ 22.83 $ 24.15
Weighted average exercise price, Expired   $ 26.97 $ 26.57
Weighted average exercise price, Forfeited $ 26.69 $ 27.89 $ 21.95
Weighted average exercise price, Outstanding at December 31 $ 35.24 $ 28.50 $ 23.85
Weighted average exercise price, Exercisable at December 31 $ 28.20 $ 24.21 $ 22.09
[1] As of December 31, 2012 , approximately 13.2 million options are vested and expected to vest. Options expected to vest reflect an estimated forfeiture rate for purposes of determining related compensation expense.