Stockholders' Equity - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	May 01, 2013
Equity [Abstract]
Maximum shares authorized for repurchase	35,000,000
Additional shares authorized for purchase	4,300,000		5,000,000
Stock repurchased, shares	4,800,000
Shares repurchased, average price per share	$ 21.89
Number of Options, exercised	123,000
Exercise price of stock options, lower range limit	$ 15.29
Exercise price of stock options, upper range limit	$ 26.06
Proceeds from stock option exercise	$ 2,332	$ 4,932