Stockholders' Equity - Summary of Stock Option Activity (Details) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($) $ / shares shares
Stock Options, Number Outstanding [Roll Forward]
Number of shares outstanding, beginning of period | shares	3,027,717
Number of shares, assumed options from acquisition | shares	178,763
Number of shares, granted | shares	280,261
Number of shares, exercised | shares	(871,712)
Number of shares, canceled or expired | shares	(32,512)
Number of shares outstanding, end of period | shares	2,582,517
Number of shares, options vested and expected to vest | shares	2,495,311
Number of shares, options vested and exercisable (in shares) | shares	1,776,779
Stock Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Weighted average exercise price, beginning of period (in dollars per share) | $ / shares	$ 69.53
Weighted average exercise price, assumed options from acquisition (in dollars per share) | $ / shares	29.92
Weighted average exercise price, granted (in dollars per share) | $ / shares	259.47
Weighted average exercise price, exercised (in dollars per share) | $ / shares	24.88
Weighted average exercise price, canceled or expired (in dollars per share) | $ / shares	56.42
Weighted average exercise price, end of period (in dollars per share) | $ / shares	102.64
Weighted average exercise price, options vested and expected to vest (in dollars per share) | $ / shares	99.16
Weighted average exercise price, options vested and exercisable (in dollars per share) | $ / shares	$ 61.55
Weighted average remaining contractual term, outstanding (in years)	5 years 11 months 20 days
Weighted average remaining contractual term, options vested and expected to vest (in years)	5 years 10 months 22 days
Weighted average remaining contractual, options vested and exercisable (in years)	4 years 11 months 20 days
Aggregate intrinsic value, outstanding | $	$ 326,696
Aggregate intrinsic value, options vested and expected to vest | $	323,542
Aggregate intrinsic value, options vested and exercisable | $	$ 292,504