Stockholders' Equity - Summary of Stock Option Activity (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Number of Shares, Outstanding at December 31, 2012	1,936
Number of Shares, Granted	531
Number of Shares, Exercised	(626)
Number of Shares, Forfeited	(107)
Number of Shares, Outstanding at December 31, 2013	1,734
Number of Shares, Exercisable at December 31, 2013	784
Number of Shares, Vested and expected to vest at December 31, 2013	1,663
Weighted Average Exercise Price Per Share, Outstanding, Beginning balance	$ 29.03
Weighted Average Exercise Price Per Share, Granted	$ 35.34
Weighted Average Exercise Price Per Share, Exercised	$ 25.93
Weighted Average Exercise Price Per Share, Forfeited	$ 32.86
Weighted Average Exercise Price Per Share, Outstanding, Ending balance	$ 31.85
Weighted Average Exercise Price Per Share, Exercisable at December 31, 2013	$ 28.80
Weighted Average Exercise Price Per Share, Vested and expected to vest at December 31, 2013	$ 31.73
Weighted Average Remaining Contractual Term, Outstanding at December 31, 2013	7 years 18 days
Weighted Average Remaining Contractual Term, Exercisable at December 31, 2013	5 years 22 days
Weighted Average Remaining Contractual Term, Vested and expected to vest at December 31, 2013	6 years 11 months 19 days
Aggregate Intrinsic Value, Outstanding at December 31, 2013	$ 11,129
Aggregate Intrinsic Value, Exercisable at December 31, 2013	7,416
Aggregate Intrinsic Value, Vested and expected to vest at December 31, 2013	$ 10,878