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Equity Compensation Plans - Summary of Stock Options Outstanding (Details) - USD ($)
$ / shares in Units, $ in Thousands
9 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Number of Options    
Outstanding, beginning balance (in shares) 9,205,690  
Granted (in shares) 1,878,647  
Exercised (in shares) (1,201,112)  
Cancelled or expired (in shares) (80,638)  
Outstanding, ending balance (in shares) 9,802,587  
Options exercisable (in shares) 7,068,093 7,159,895
Weighted Average Exercise Price    
Outstanding, beginning balance (in dollars per share) $ 31.11  
Granted (in dollars per share) 72.21  
Exercised (in dollars per share) 26.06  
Cancelled or expired (in dollars per share) 62.27  
Outstanding, ending balance (in dollars per share) 39.35  
Options exercisable (in dollars per share) $ 28.89 $ 24.00
Aggregate Intrinsic Value    
Outstanding, beginning balance $ 303,267  
Exercised 55,971  
Outstanding, ending balance 338,821  
Aggregate intrinsic value, options exercisable $ 318,170 $ 286,728