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Cash Dividends Declared (Detail) - $ / shares
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Dividends Payable [Line Items]    
Dividend per share $ 0.085 $ 0.085
Dividend Payment 1st    
Dividends Payable [Line Items]    
Dividend per share $ 0.0425  
Date declared Mar. 12, 2019  
Date of record May 01, 2019  
Payment date May 15, 2019  
Dividend Payment 2nd    
Dividends Payable [Line Items]    
Dividend per share $ 0.0425  
Date declared Jun. 27, 2019  
Date of record Aug. 01, 2019  
Payment date Aug. 15, 2019