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Cash Dividends Declared (Detail) - $ / shares
12 Months Ended
Mar. 12, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dividends Payable [Line Items]        
Dividend per share   $ 0.17 $ 0.17 $ 0.17
Date declared May 15, 2019      
Dividend Payment 1st        
Dividends Payable [Line Items]        
Dividend per share   $ 0.0425    
Date declared   Mar. 08, 2017    
Date of record   May 01, 2017    
Payment date   May 15, 2017    
Dividend Payment 2nd        
Dividends Payable [Line Items]        
Dividend per share   $ 0.0425    
Date declared   Jun. 22, 2017    
Date of record   Aug. 01, 2017    
Payment date   Aug. 15, 2017    
Dividend Payment 3rd        
Dividends Payable [Line Items]        
Dividend per share   $ 0.0425    
Date declared   Aug. 04, 2017    
Date of record   Nov. 01, 2017    
Payment date   Nov. 15, 2017    
Dividend Payment 4th        
Dividends Payable [Line Items]        
Dividend per share   $ 0.0425    
Date declared   Nov. 07, 2017    
Date of record   Feb. 01, 2018    
Payment date   Feb. 15, 2018    
Dividend Payment 5th        
Dividends Payable [Line Items]        
Dividend per share   $ 0.0425    
Date declared   Mar. 08, 2018    
Date of record   May 01, 2018    
Payment date   May 15, 2018    
Dividend Payment 6th        
Dividends Payable [Line Items]        
Dividend per share   $ 0.0425    
Date declared   Jun. 28, 2018    
Date of record   Aug. 01, 2018    
Payment date   Aug. 15, 2018    
Dividend Payment 7th        
Dividends Payable [Line Items]        
Dividend per share   $ 0.0425    
Date declared   Jul. 31, 2018    
Date of record   Nov. 01, 2018    
Payment date   Nov. 15, 2018    
Dividend Payment 8th        
Dividends Payable [Line Items]        
Dividend per share   $ 0.0425    
Date declared   Nov. 07, 2018    
Date of record   Feb. 01, 2019    
Payment date   Feb. 15, 2019