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Employee Benefit - Maturity Profile of Defined Benefit Obligation (Detail) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 USD ($) yr | Dec. 31, 2016 USD ($) yr
Disclosure of defined benefit plans [Line Items] |  |
Expected payments | $ 21,068 | $ 18,062
Weight average duration of defined benefit obligation | yr | 11 |
Bottom of range [Member] |  |
Disclosure of defined benefit plans [Line Items] |  |
Weight average duration of defined benefit obligation | yr |  | 11
Top of range [Member] |  |
Disclosure of defined benefit plans [Line Items] |  |
Weight average duration of defined benefit obligation | yr |  | 12
Within one year [Member] |  |
Disclosure of defined benefit plans [Line Items] |  |
Expected payments | $ 877 | $ 594
Between 2 and 5 years [Member] |  |
Disclosure of defined benefit plans [Line Items] |  |
Expected payments | 1,616 | 1,496
Between 5 and 10 years [Member] |  |
Disclosure of defined benefit plans [Line Items] |  |
Expected payments | 3,183 | 2,431
Beyond 10 years [Member] |  |
Disclosure of defined benefit plans [Line Items] |  |
Expected payments | $ 15,392 | $ 13,541

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- Definition The estimate of the expected contributions to be made to a defined benefit plan for the next annual reporting period. [Refer: Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 147 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_147_b&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 148 -Subparagraph d -Clause iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_148_d_iii&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The weighted average duration of a defined benefit obligation. [Refer: Weighted average [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 147 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_147_c&doctype=Standard -URIDate 2017-03-09 + Details
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