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Options Outstanding and Aggregate Intrinsic Value (Detail) (USD $)
In Thousands, 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, 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
Aggregate intrinsic value, Outstanding at beginning of year $ 321,753    
Aggregate intrinsic value, Outstanding as of December 31 196,927 321,753  
Aggregate intrinsic value, Exercisable as of December 31 $ 173,229    
[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.