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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
3 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Number of Shares (in shares)    
Unvested beginning balance (in shares) 1,375  
RSUs granted (in shares) 283  
RSUs vested (in shares) (119)  
RSUs forfeited (in shares) (20)  
Unvested ending balance (in shares) 1,519 1,375
Vested and expected to vest (in shares) 1,519  
Restricted Stock Awards, Weighted Average Grant Date Fair Value    
Unvested beginning balance (usd per share) $ 74.23  
RSUs granted (usd per share) 109.51  
RSUs vested (usd per share) 72.85  
RSUs forfeited (usd per share) 69.30  
Unvested ending balance (usd per share) 80.97 $ 74.23
Vested and expected to vest (usd per share) $ 80.97  
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 1 year 10 months
Vested and expected to vest, weighted-average contractual term (in years) 1 year 10 months  
Unvested balance, aggregate intrinsic value $ 200,947 $ 133,081
Vested and expected to vest, aggregate intrinsic value $ 200,947