Stockholders' Equity - Schedule of Share Repurchase Authorized by Board of Directors (Detail)	3 Months Ended
	Mar. 31, 2016 USD ($)
October, 2013 [Member]
Equity, Class of Treasury Stock [Line Items]
Share Repurchase Authorization	$ 100,000,000
Expiration	Dec. 31, 2015
April, 2014 [Member]
Equity, Class of Treasury Stock [Line Items]
Share Repurchase Authorization	$ 200,000,000
Expiration	Dec. 31, 2015
February, 2015 [Member]
Equity, Class of Treasury Stock [Line Items]
Share Repurchase Authorization	$ 150,000,000
Expiration	Dec. 31, 2016
January, 2016 [Member]
Equity, Class of Treasury Stock [Line Items]
Share Repurchase Authorization	$ 200,000,000
Expiration	Dec. 31, 2017