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Earnings Per Share - Summary of Number of Shares Attributable to Equity Holders (Detail) - shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Weighted average ordinary shares and adjusted weighted average ordinary shares [abstract]
Weighted average number of ordinary shares used to calculate basic earnings per share	110,164,320	105,500,327	105,097,442
Effect of other dilutive potential ordinary shares	0	0	0
Weighted average number of ordinary shares used to calculate diluted earnings per share	110,164,320	105,500,327	105,097,442

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- Definition

The weighted average number of ordinary shares outstanding plus the weighted average number of ordinary shares that would be issued on the conversion of all the dilutive potential ordinary shares into ordinary shares. [Refer: Ordinary shares [member]; Weighted average [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

The number of dilutive potential ordinary shares that relate to the assumed exercise of the entity's share options.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 33
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- Definition

The number of ordinary shares outstanding at the beginning of the period, adjusted by the number of ordinary shares bought back or issued during the period multiplied by a time-weighting factor.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Number 33
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