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Cash Dividends Declared (Detail)
9 Months Ended
Sep. 30, 2018
$ / shares
Dividend Payment 1st  
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 2nd  
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 3rd  
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