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Acquisition of Pharmasset, Inc. Table of Pro Forma of Pharmasset (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Business Combinations [Abstract]    
Business Acquisition, Pro Forma Revenue $ 2,282,449 $ 1,926,094
Business Acquisition, Pro Forma Net Income (Loss) $ 574,375 $ 397,165