Stock-Based Awards - Summary of Stock Options Outstanding (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Exercisable Shares-March 31, 2014	1,983
Options vested and expected to vest, Shares-March 31, 2014	2,841
Exercisable Weighted-Average Exercise Price-March 31, 2014	$ 5.56
Options vested and expected to vest, Weighted-Average Exercise Price-March 31, 2014	$ 13.71
Exercisable, Weighted-Average Remaining Contractual Life (in Years)-March 31, 2014	6 years 1 month 28 days
Options vested and expected to vest, Weighted-Average Remaining Contractual Life (in Years)-March 31, 2014	6 years 9 months 26 days
Exercisable, Aggregate Intrinsic Value-March 31, 2014	$ 116,010
Options vested and expected to vest, Aggregate Intrinsic Value-March 31, 2014	$ 143,550