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Cash Dividends Declared (Detail) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dividend Declared [Line Items]        
Dividend per share $ 0.03750 $ 0.03125 $ 0.11250 $ 0.09375
Payment date Nov. 14, 2014      
Dividend Payment 1st
       
Dividend Declared [Line Items]        
Dividend per share     $ 0.03750 $ 0.03125
Date declared     Mar. 11, 2014 Mar. 12, 2013
Date of record     May 01, 2014 May 01, 2013
Payment date     May 15, 2014 May 15, 2013
Dividend Payment 2nd
       
Dividend Declared [Line Items]        
Dividend per share     $ 0.03750 $ 0.03125
Date declared     Jun. 19, 2014 Jun. 13, 2013
Date of record     Aug. 01, 2014 Aug. 01, 2013
Payment date     Aug. 15, 2014 Aug. 15, 2013
Dividend Payment 3rd
       
Dividend Declared [Line Items]        
Dividend per share     $ 0.03750 $ 0.03125
Date declared     Jul. 29, 2014 Aug. 02, 2013
Date of record     Oct. 31, 2014 Nov. 01, 2013
Payment date     Nov. 14, 2014 Nov. 15, 2013