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Cash Dividends Declared (Detail) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dividend Declared [Line Items]        
Dividend per share $ 0.025 $ 0.025 $ 0.075 $ 0.050
Dividend Payment 1st
       
Dividend Declared [Line Items]        
Dividend per share     $ 0.025  
Date declared     Jan. 11, 2012  
Date of record     Feb. 01, 2012  
Payment date     Feb. 15, 2012  
Dividend Payment 2nd
       
Dividend Declared [Line Items]        
Dividend per share     $ 0.025  
Date declared     Mar. 06, 2012  
Date of record     May 01, 2012  
Payment date     May 15, 2012  
Dividend Payment 3rd
       
Dividend Declared [Line Items]        
Dividend per share     $ 0.025  
Date declared     Jun. 13, 2012  
Date of record     Aug. 01, 2012  
Payment date     Aug. 15, 2012