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Aggregate dividends declared during the period for each share of common stock outstanding.

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Stockholders' Equity - Additional Information (Detail) (USD $)	3 Months Ended				1 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013 Employees	Mar. 31, 2013 Stock Repurchase Plan	Jul. 25, 2012 Stock Repurchase Plan Maximum	Apr. 24, 2013 Dividend Declared Subsequent Event
Stockholders Equity Note [Line Items]
Dividend declaration date						Apr. 24, 2013
Dividend per share, declared						$ 0.05
Dividend payment date	Mar. 29, 2013	Mar. 30, 2012				Jun. 28, 2013
Dividend record date						Jun. 14, 2013
Amount approved for repurchases under stock buyback program				$ 51,100,000	$ 150,000,000
Treasury stock shares acquired			637,624	0
Purchase price for treasury stock acquired	$ 15,201,000		$ 15,200,000