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Directors' and key management remuneration - Summary of aggregate compensation representing the expense recognised under IFRS (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure Of Directors And Key Management Remuneration [Abstract]
Short-term employee benefits and costs	$ 23,095	$ 22,269	$ 25,616
Post-employment benefits	415	3,461	1,049
Employment termination benefits		2,682
Share-based payments	8,033	15,806	17,566
Aggregate compensation	$ 31,543	$ 44,218	$ 44,231

X

- Definition

The amount of compensation to key management personnel. [Refer: Key management personnel of entity or parent [member]]

+ References

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-Number 24
-IssueDate 2016-01-13
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-URIDate 2016-03-31

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X

- Definition

The amount of compensation to key management personnel in the form of post-employment benefits. [Refer: Key management personnel of entity or parent [member]]

+ References

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- Definition

The amount of compensation to key management personnel in the form of share-based payments. [Refer: Key management personnel of entity or parent [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 24
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- Definition

The amount of compensation to key management personnel in the form of short-term employee benefits. [Refer: Key management personnel of entity or parent [member]]

+ References

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

The amount of compensation to key management personnel in the form of termination benefits. [Refer: Termination benefits expense; Key management personnel of entity or parent [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Number 24
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Disclosure of directors and key management remuneration.

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No definition available.

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