Stockholders' Equity - Additional Information (Detail) (USD $)	6 Months Ended			1 Months Ended
	Jun. 30, 2013	Jun. 30, 2013 Employees	Jun. 30, 2013 Stock Repurchase Plan	Jul. 25, 2012 Stock Repurchase Plan Maximum	Jul. 24, 2013 Dividend Declared Subsequent Event
Stockholders Equity Note [Line Items]
Dividend declaration date					Jul. 24, 2013
Dividend per share, declared					$ 0.05
Dividend payment date					Sep. 30, 2013
Dividend record date					Sep. 16, 2013
Amount approved for repurchases under stock buyback program			$ 50,900,000	$ 150,000,000
Treasury stock acquired, Values	$ 22,358,000	$ 22,100,000	$ 227,000
Treasury stock acquired, Shares		947,926	10,762