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Issued Capital and Preference Shares - Summary of Issued Capital and Preference Shares (Parenthetical) (Detail)
Dec. 31, 2018
$ / shares
Dec. 31, 2018
¥ / shares
Dec. 31, 2017
$ / shares
Dec. 31, 2017
¥ / shares
Ordinary shares [member]        
Disclosure of classes of share capital [line items]        
Par value | (per share) $ 0.10 ¥ 0.10 $ 0.10 ¥ 0.10