Stock-Based Awards and Other Equity Instruments - Summary of Stock Option Activity (Details) - Stock Options - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Options
Beginning balance (in shares)	17,055	14,435	15,427
Granted (in shares)	5,670	7,572	4,113
Exercised (in shares)	(2,686)	(4,201)	(3,804)
Cancelled (in shares)	(1,198)	(751)	(1,301)
Ending balance (in shares)	18,841	17,055	14,435
Exercisable as of December 31, 2016 (in shares)	5,770
Vested and expected to vest after December 31, 2016 (in shares)	18,841
Weighted Average Exercise Price
Beginning balance (in dollars per share)	$ 71.77	$ 49.33	$ 36.03
Granted (in dollars per share)	105.37	94.13	78.70
Exercised (in dollars per share)	47.57	34.57	25.66
Cancelled (in dollars per share)	91.62	74.06	53.69
Ending balance (in dollars per share)	84.07	$ 71.77	$ 49.33
Exercisable as of December 31, 2016 (in dollars per share)	58.27
Vested and expected to vest after December 31, 2016 (in dollars per share)	$ 84.07
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Remaining Contractual Life (In years), Balance as of December 31, 2016	4 years 8 months 12 days
Remaining Contractual Life (In years), Exercisable as of December 31, 2016	3 years 1 month 6 days
Remaining Contractual Life (In years), Vested and expected to vest after December 31, 2016	4 years 8 months 12 days
Aggregate intrinsic value, Balance as of December 31, 2016	$ 552,445
Aggregate intrinsic value, Exercisable as of December 31, 2016	317,909
Aggregate intrinsic value, Vested and expected to vest after December 31, 2016	$ 552,445