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Dividends Declared Per Share (Detail) - $ / shares
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dividends Payable [Line Items]    
Dividend Amount $ 0.355 $ 0.350
Group One    
Dividends Payable [Line Items]    
Declaration Date Apr. 20, 2016  
Date Paid (Payable) May 27, 2016  
Shareholder of Record Date May 13, 2016  
Dividend Amount $ 0.355  
Group Two    
Dividends Payable [Line Items]    
Declaration Date Jan. 27, 2016  
Date Paid (Payable) Feb. 26, 2016  
Shareholder of Record Date Feb. 12, 2016  
Dividend Amount $ 0.355  
Group Three    
Dividends Payable [Line Items]    
Declaration Date Oct. 21, 2015  
Date Paid (Payable) Nov. 27, 2015  
Shareholder of Record Date Nov. 13, 2015  
Dividend Amount $ 0.350  
Group Four    
Dividends Payable [Line Items]    
Declaration Date Jul. 22, 2015  
Date Paid (Payable) Aug. 28, 2015  
Shareholder of Record Date Aug. 14, 2015  
Dividend Amount $ 0.350  
Group Five    
Dividends Payable [Line Items]    
Declaration Date Apr. 22, 2015  
Date Paid (Payable) May 28, 2015  
Shareholder of Record Date May 14, 2015  
Dividend Amount $ 0.350  
Group Six    
Dividends Payable [Line Items]    
Declaration Date Jan. 26, 2015  
Date Paid (Payable) Feb. 27, 2015  
Shareholder of Record Date Feb. 13, 2015  
Dividend Amount $ 0.350