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v3.19.1

Stated Capital - Additional Information (Detail) - $ / shares | May 22, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | May 25, 2017 | May 24, 2017
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Disclosure of classes of share capital [line items] |  |  |  |  |
Shares authorised |  |  |  |  | 1,000,000,000
Par value per share |  |  |  |  | $ 0.5
Top of range [member] |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |
Buy back of ordinary shares during any financial year as percentage of issued share capital | 20.00% |  |  |  |
Top of Range Issued Share Capital [member] |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |
Percentage of authorised but unissued stated capital as percentage of issued stated capital | 5.00% |  |  |  |
Ordinary Shares [member] |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |
Shares authorised |  | 2,000,000,000 | 2,000,000,000 | 2,000,000,000 | 1,000,000,000
No par value per share |  |  |  | $ 0 | $ 0

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