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Share Based Compensation (Summary of Changes in Number of Shares of Common Stock Under Option) (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 Arrangement by Share-based Payment Award [Line Items]      
Shares, Outstanding, Beginning Balance 8,341 10,229 8,062
Shares, Granted 1,223 526 3,724
Shares, Exercised (2,925) (2,008) (143)
Shares, Forfeited (74) (406) (729)
Shares, Tendered     (685)
Shares, Outstanding, Ending Balance 6,565 8,341 10,229
Weighted Average Exercise Price, Outstanding, Beginning balance $ 15.51 $ 12.79 $ 7.45
Shares, Vested and expected to vest 6,565    
Weighted Average Exercise Price, Granted $ 36.94 $ 30.56 $ 22.56
Weighted Average Exercise Price, Exercised $ 9.38 $ 4.51 $ 5.04
Weighted Average Exercise Price, Forfeited $ 20.43 $ 20.96 $ 11.95
Weighted Average Exercise Price, Tendered     $ 5.63
Weighted Average Exercise Price, Outstanding, Ending balance $ 22.17 $ 15.51 $ 12.79
Options Exercisable at End of Period, Outstanding, Beginning Balance 4,394 5,168 5,523
Weighted Average Exercise Price, Expected to vest $ 22.17    
Options Exercisable at End of Period, Outstanding, Ending Balance 2,666 4,394 5,168
Weighted Average Exercise Price of Exercisable Options, Outstanding, Beginning Balance $ 10.13 $ 6.06 $ 5.15
Weighted Average Exercise Price of Exercisable Options, Outstanding, Ending Balance $ 14.71 $ 10.13 $ 6.06
Aggregate Intrinsic Value, Outstanding, Beginning Balance $ 119,802 $ 128,472 $ 70,958
Weighted Average Fair Value of Options Granted During the Period, Granted $ 10.82 $ 9.72 $ 9.19
Aggregate Intrinsic Value, Exercised 129,488 50,921 3,697
Aggregate Intrinsic Value, Outstanding, Ending Balance $ 206,636 $ 119,802 $ 128,472