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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, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure Of Directors And Key Management Remuneration [Abstract]
Short-term employee benefits and costs	$ 21,685	$ 22,075	$ 23,978
Post-employment benefits	369	477	629
Employment termination benefits	2,789	310	69
Share-based payments	34,954	17,632	14,916
Total	$ 59,797	$ 40,494	$ 39,592

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 2020-01-01
-Paragraph 17
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-URIDate 2020-01-01

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- 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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-Name IAS
-Number 24
-IssueDate 2020-01-01
-Paragraph 17
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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
-IssueDate 2020-01-01
-Paragraph 17
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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

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-Name IAS
-Number 24
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-Paragraph 17
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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
-Name IAS
-Number 24
-IssueDate 2020-01-01
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- Definition

Disclosure of directors and key management remuneration.

+ References

No definition available.

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