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Cash Dividends Declared (Detail) - $ / shares
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dividends Payable [Line Items]        
Dividend per share $ 0.0425 $ 0.0375 $ 0.1175 $ 0.1125
Payment date Nov. 13, 2015      
Dividend Payment 1st        
Dividends Payable [Line Items]        
Dividend per share     $ 0.0375  
Date declared     Mar. 04, 2015  
Date of record     May 01, 2015  
Payment date     May 15, 2015  
Dividend Payment 2nd        
Dividends Payable [Line Items]        
Dividend per share     $ 0.0375  
Date declared     Jun. 10, 2015  
Date of record     Jul. 31, 2015  
Payment date     Aug. 14, 2015  
Dividend Payment 3rd        
Dividends Payable [Line Items]        
Dividend per share     $ 0.0425  
Date declared     Aug. 04, 2015  
Date of record     Oct. 30, 2015  
Payment date     Nov. 13, 2015