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Summary of Activity Related to Share-Based Payment Awards (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Equity Grants
 
Number of shares  
Unvested Balance at January 1, 2012, Number of Shares 8,351
Granted, Number of Shares 3,312
Modified, Number of Shares   
Forfeited, Number of Shares (393)
Vested, Number of Shares (3,298)
Unvested Balance at December 31, 2012, Number of Shares 7,972
Grant Date Weighted Average Fair Value  
Unvested Balance at January 1, 2012, Grant Date Weighted Average Fair Value $ 188,051
Granted, Grant Date Weighted Average Fair Value $ 94,059
Modified, Grant Date Weighted Average Fair Value   
Forfeited, Grant Date Weighted Average Fair Value $ (8,939)
Vested, Grant Date Weighted Average Fair Value $ (76,303)
Unvested Balance at December 31, 2012, Grant Date Weighted Average Fair Value $ 196,868
Acquisition-Related
 
Number of shares  
Unvested Balance at January 1, 2012, Number of Shares 1,911
Granted, Number of Shares 54
Modified, Number of Shares   
Vested, Number of Shares (246)
Unvested Balance at December 31, 2012, Number of Shares 1,719
Grant Date Weighted Average Fair Value  
Unvested Balance at January 1, 2012, Grant Date Weighted Average Fair Value $ 43,537
Granted, Grant Date Weighted Average Fair Value $ 1,421
Modified, Grant Date Weighted Average Fair Value   
Vested, Grant Date Weighted Average Fair Value $ (5,620)
Unvested Balance at December 31, 2012, Grant Date Weighted Average Fair Value $ 39,338