XML 163 R156.htm IDEA: XBRL DOCUMENT
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Share-based Payment - Number and Weighted Average Exercise Prices ("WAEP") of, and Movements in Share Options (Detail) | 12 Months Ended
--- | ---
Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Disclosure of terms and conditions of share-based payment arrangement [Abstract] |  |
Beginning balance | 530,000 | 570,000
Exercised during the year | (46,400) |
Cancelled during the year | (13,600) | (40,000)
Ending balance | 470,000 | 530,000
Exercisable at December 31 | 470,000 | 353,333
Beginning balance | $ 21.11 | $ 21.11
Exercised during the year | 21.11 |
Cancelled during the year | 21.11 | 21.11
Ending balance | 21.11 | 21.11
Exercisable at December 31 | $ 21.11 | $ 21.11

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