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Cash Dividends Declared (Detail) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2012
Sep. 30, 2011
Dividend Declared [Line Items]      
Dividend per share $ 0.025 $ 0.100 $ 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  
Dividend Payment 4th
     
Dividend Declared [Line Items]      
Dividend per share   $ 0.025  
Date declared   Jul. 31, 2012  
Date of record   Nov. 01, 2012  
Payment date   Nov. 15, 2012