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Cash Dividends Declared (Detail)
12 Months Ended
Dec. 31, 2017
$ / shares
Dividend Payment 1st  
Dividends Payable [Line Items]  
Dividend per share $ 0.0425
Date declared Mar. 03, 2016
Date of record May 02, 2016
Payment date May 16, 2016
Dividend Payment 2nd  
Dividends Payable [Line Items]  
Dividend per share $ 0.0425
Date declared Jun. 09, 2016
Date of record Aug. 01, 2016
Payment date Aug. 15, 2016
Dividend Payment 3rd  
Dividends Payable [Line Items]  
Dividend per share $ 0.0425
Date declared Aug. 04, 2016
Date of record Nov. 01, 2016
Payment date Nov. 15, 2016
Dividend Payment 4th  
Dividends Payable [Line Items]  
Dividend per share $ 0.0425
Date declared Nov. 03, 2016
Date of record Feb. 01, 2017
Payment date Feb. 15, 2017
Dividend Payment 5th  
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 6th  
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 7th  
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 8th  
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