Stock Plans - Summary of Option Activity Under Plans and Related Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2014	Dec. 31, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Number of Stock Options Outstanding, - Beginning Balance	1,675,506
Options Outstanding, Number of Shares, Granted	579,705
Options Outstanding, Number of Shares, Exercised or released	(168,247)
Options Outstanding, Number of Shares, Cancelled or forfeited	(45,576)
Options Outstanding, Number of Shares, Options assumed in acquisitions	72,607
Number of Stock Options Outstanding, - Ending Balance	2,113,995	1,675,506
Options Outstanding, Number of Shares, Exercisable	556,089
Options Outstanding, weighted Average Exercise Price - Beginning Balance	$ 23.78
Options Outstanding, weighted Average Exercise Price, Granted	$ 55.79
Options Outstanding, weighted Average Exercise Price, Exercised	$ 14.69
Options Outstanding, weighted Average Exercise Price, Cancelled or forfeited	$ 29.18
Options Outstanding, weighted Average Exercise Price, Options assumed in acquisitions	$ 14.14
Options Outstanding, weighted Average Exercise Price - Ending Balance	$ 32.83	$ 23.78
Options Outstanding, weighted Average Exercise Price, Exercisable	$ 15.66
Remaining Contractual Life (in years)	8 years 5 months 1 day	8 years 4 days
Remaining Contractual Term (in years), Exercisable	6 years 11 months 27 days
Aggregate Intrinsic Value - Beginning Balance	$ 40,813
Aggregate Intrinsic Value - Ending Balance	48,984	40,813
Aggregate Intrinsic Value, Exercisable	$ 22,265