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Unvested Restricted Stock Units Actvity (Detail) (Restricted Stock Units (RSUs), USD $)
12 Months Ended
Dec. 31, 2011
Restricted Stock Units (RSUs)
 
Unvested restricted stock units - number of shares  
Unvested at December 31, 2010 6,671,971
Granted 5,260,421
Vested (2,691,549)
Forfeited/canceled (418,195)
Unvested at December 31, 2011 8,822,648
Expected to vest after December 31, 2011 7,903,328 [1]
Unvested restricted stock units - weighted-average grant-date fair value  
Unvested at December 31, 2010 $ 509.04
Granted $ 531.20
Vested $ 516.22
Forfeited/canceled $ 538.01
Unvested at December 31, 2011 $ 520.27
Expected to vest after December 31, 2011 $ 520.27 [1]
[1] RSUs expected to vest reflect an estimated forfeiture rate.