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Cash Dividends Declared (Detail) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dividend Declared [Line Items]        
Dividend per share $ 0.03125 $ 0.02500 $ 0.09375 $ 0.10000
Dividend Payment 1st
       
Dividend Declared [Line Items]        
Dividend per share     $ 0.03125 $ 0.025
Date declared     Mar. 12, 2013 Jan. 11, 2012
Date of record     May 01, 2013 Feb. 01, 2012
Payment date     May 15, 2013 Feb. 15, 2012
Dividend Payment 2nd
       
Dividend Declared [Line Items]        
Dividend per share     $ 0.03125 $ 0.025
Date declared     Jun. 13, 2013 Mar. 06, 2012
Date of record     Aug. 01, 2013 May 01, 2012
Payment date     Aug. 15, 2013 May 15, 2012
Dividend Payment 3rd
       
Dividend Declared [Line Items]        
Dividend per share     $ 0.03125 $ 0.025
Date declared     Aug. 02, 2013 Jun. 13, 2012
Date of record     Nov. 01, 2013 Aug. 01, 2012
Payment date     Nov. 15, 2013 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