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Dividends Declared and Paid - Summary of Dividends Declared and Paid (Parenthetical) (Detail) - $ / shares
12 Months Ended
Jul. 13, 2017
Jun. 29, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of dividends declared and paid on ordinary capital [Abstract]          
Dividends paid per ordinary share $ 0.90 $ 0.85 $ 0.90 $ 0.85 $ 1.10