Trade and Other Receivables - Movement in the Loss Allowances on Trade Receivables (Detail) - Trade receivables [Member] - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Disclosure of financial assets [Line Items]
Beginning balance	$ 3,472	$ 3,342
Charge for the year		610
Write-off		(429)
Unused amounts reversed		(308)
Currency translation adjustment		260
Reclassification		(3)
Ending balance		3,472
Increase (decrease) due to changes in accounting policy required by IFRSs [member]
Disclosure of financial assets [Line Items]
Beginning balance	(16)
Ending balance		(16)
IFRS 9 [Member]
Disclosure of financial assets [Line Items]
Beginning balance	3,456
Charge for the year	726
Write-off	(2,292)
Unused amounts reversed	(156)
Currency translation adjustment	(74)
Reclassification	(3)
Ending balance	1,657	3,456
Individually impaired [Member]
Disclosure of financial assets [Line Items]
Beginning balance	2,985	2,981
Charge for the year		438
Write-off		(385)
Unused amounts reversed		(269)
Currency translation adjustment		223
Reclassification		(3)
Ending balance		2,985
Collectively impaired [Member]
Disclosure of financial assets [Line Items]
Beginning balance	$ 487	361
Charge for the year		172
Write-off		(44)
Unused amounts reversed		(39)
Currency translation adjustment		37
Ending balance		$ 487

The amount of additional allowance for credit losses of financial assets recognised in profit or loss. [Refer: Allowance account for credit losses of financial assets]

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Note Expiry date 2021-01-01
-Name IFRS
-Number 7
-IssueDate 2018-01-01
-Paragraph 16
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-02&anchor=para_16&doctype=Standard&book=b
-URIDate 2018-03-16

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- Definition

The amount of an allowance account used to record impairments to financial assets due to credit losses. [Refer: Financial assets]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Expiry date 2021-01-01
-Name IFRS
-Number 7
-IssueDate 2018-01-01
-Paragraph 16
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-02&anchor=para_16&doctype=Standard&book=b
-URIDate 2018-03-16

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

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- Definition

The increase (decrease) in an allowance account for credit losses of financial assets resulting from the net exchange differences arising when the financial statements are translated from the functional currency into a different presentation currency, including the translation of a foreign operation into the presentation currency of the reporting entity. [Refer: Allowance account for credit losses of financial assets]

+ References

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- Definition

The increase (decrease) in allowance account for credit losses of financial assets resulting from changes that the entity does not separately disclose in the same statement or note. [Refer: Allowance account for credit losses of financial assets]

+ References

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- Definition

The decrease in an allowance account for credit losses of financial assets resulting from the reversal of impairment. [Refer: Allowance account for credit losses of financial assets]

+ References

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- Definition

The decrease in an allowance account for credit losses of financial assets resulting from the utilisation of the allowance. [Refer: Allowance account for credit losses of financial assets]

+ References

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