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Cash Dividends Declared (Detail) - $ / shares
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dividends Payable [Line Items]        
Dividend per share $ 0.0375 $ 0.0375 $ 0.0750 $ 0.0750
Payment date Aug. 15, 2015      
Dividend Payment 1st        
Dividends Payable [Line Items]        
Dividend per share     $ 0.03750  
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     $ 0.03750  
Date declared     Jun. 10, 2015  
Date of record     Jul. 31, 2015  
Payment date     Aug. 14, 2015