Stockholders' Equity - Schedule of Share Repurchase Authorized by Board of Directors (Detail) (USD $) In Thousands, unless otherwise specified	1 Months Ended					3 Months Ended
	Oct. 31, 2013	Oct. 31, 2012	Apr. 30, 2012	Oct. 31, 2011	Feb. 28, 2011	Mar. 31, 2014
Stockholders Equity Note [Abstract]
Share Repurchase Authorization	$ 100,000	$ 200,000	$ 125,000	$ 125,000	$ 250,000
Expiration	December 31, 2015	December 31, 2014	December 31, 2013	December 31, 2013	December 31, 2012	December 31, 2015