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Dividends - Summary of Quarterly Dividend Calendar (Detail)
 6 Months Ended
Jun. 30, 2018
Quarterly dividend for Q2 2018 [member]  
Disclosure of Dividends [Line Items]  
Announcement Date Jul. 19, 2018
Ex-Dividend Date Aug. 02, 2018
Record Date Aug. 03, 2018
Payment Date Sep. 05, 2018
Quarterly dividend for Q3 2018 [member]  
Disclosure of Dividends [Line Items]  
Announcement Date Oct. 18, 2018
Ex-Dividend Date Nov. 01, 2018
Record Date Nov. 02, 2018
Payment Date Dec. 05, 2018