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Stockholders' Equity - Additional Information (Detail) (USD $)
 3 Months Ended 6 Months Ended 1 Months Ended 6 Months Ended 1 Months Ended
Jun. 30, 2012
Mar. 31, 2012
Jun. 30, 2011
Mar. 31, 2011
Jun. 30, 2012
Aug. 01, 2007
Maximum
Jun. 30, 2012
Employees
Jun. 30, 2012
Stock Repurchase Plan
Jul. 25, 2012
Dividend Declared
Jul. 25, 2012
Subsequent Event
Maximum
Stockholders Equity Note [Line Items]                    
Dividend declaration date                 Jul. 25, 2012  
Dividend per share, declared                 $ 0.05  
Dividend payment date Jun. 29, 2012 Mar. 30, 2012 Jun. 30, 2011 Mar. 30, 2011         Sep. 28, 2012  
Dividend record date                 Sep. 14, 2012  
Amount approved for repurchases under stock buyback program           $ 250,000,000       $ 150,000,000
Treasury stock shares acquired, Shares               4,700,000    
Treasury stock shares acquired, Value               70,100,000    
Amount authorized to purchase the Company's outstanding common stock under the program 42,800,000       42,800,000          
Treasury stock shares acquired             83,229      
Purchase price for treasury stock acquired         $ 71,337,000   $ 1,200,000