Share Based Payments - Summary of Stock Option Activity under all Equity Plans (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]
Beginning balance, Number of Shares	2,710
Options granted, Number of Shares	100
Options exercised, Number of Shares	(202)
Options canceled or expired, Number of Shares	(34)
Ending balance, Number of Shares	2,574
Beginning balance, Weighted Average Exercise Price	$ 34.05
Options granted, Weighted Average Exercise Price	$ 97.93
Options exercised, Weighted Average Exercise Price	$ 14.71
Options canceled or expired, Weighted Average Exercise Price	$ 46.61
Ending balance, Weighted Average Exercise Price	$ 37.88