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Equity Award Plan Activities - Restricted Stock Unit Awards (Details) - Restricted Stock Units (RSUs) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2016
Dec. 31, 2015
Number of Shares (in shares)    
Unvested beginning balance (in shares) 893  
RSUs granted (in shares) 369  
RSUs vested (in shares) (130)  
RSUs forfeited (in shares) (56)  
Unvested ending balance (in shares) 1,076 893
Vested and expected to vest (in shares) 1,006  
Restricted Stock Awards, Weighted Average Grant Date Fair Value    
Unvested beginning balance (usd per share) $ 70.14  
RSUs granted (usd per share) 61.81  
RSUs vested (usd per share) 69.02  
RSUs forfeited (usd per share) 67.29  
Unvested ending balance (usd per share) 67.57 $ 70.14
Vested and expected to vest (usd per share) $ 67.60  
Weighted- Average Remaining Contractual Term and Aggregate Intrinsic Value of Stock Options Outstanding    
Unvested balance, weighted-average remaining contractual term (in years) 1 year 10 months 24 days 1 year 10 months 24 days
Vested and expected to vest, weighted-average contractual term (in years) 1 year 9 months 18 days  
Unvested balance, aggregate intrinsic value $ 69,302 $ 69,509
Vested and expected to vest, aggregate intrinsic value $ 64,766