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Dividends - Additional Information (Detail) - Subsequent Event [Member]
Nov. 08, 2017
$ / shares
Dividends Payable [Line Items]  
Quarterly dividend payment per share $ 0.25
Cash dividend anticipated payable date 2018-04
First Installment [Member]  
Dividends Payable [Line Items]  
Dividends payable date declared Nov. 08, 2017
Quarterly dividend payment per share $ 0.22
Record Date Dec. 29, 2017
Cash dividend payable date Jan. 19, 2018