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Net employee defined benefit - Summary of Reconciliation of Net Employee Defined Benefit Liabilities (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of net defined benefit asset (liability) [line items] |  |  |
Beginning balance | $ 249 | $ 5,091 | $ 3,185
Current service cost | (2,393) | (2,192) | (2,105)
Interest (cost) income | 25 | 92 | 24
Return on plan assets | 374 |  | 483
Experience (loss) gain | (4,001) | (1,681) | (1,943)
Investment return |  | 138 | 67
Actuarial changes arising from changes in financial assumptions | (1,028) | (1,874) | 877
Employer contributions | 1,709 | 1,903 | 4,780
Benefits paid | 456 | (79) | (209)
Adjustments | (7) | (1,149) | (68)
Ending balance | (14,332) | 249 | 5,091
Past service cost | (457) |  |
Curtailment / Settlement | 2,026 |  |
Actuarial changes arising from changes in demographic assumptions | (11,285) |  |
Defined benefit obligation [member] |  |  |
Disclosure of net defined benefit asset (liability) [line items] |  |  |
Beginning balance | (28,195) | (22,568) | (19,997)
Current service cost | (2,393) | (2,192) | (2,105)
Interest (cost) income | (706) | (887) | (642)
Return on plan assets | 0 |  | 0
Experience (loss) gain | (4,001) | (1,681) | (1,943)
Investment return |  |  | 0
Actuarial changes arising from changes in financial assumptions | (1,028) | (1,874) | 877
Employer contributions | 0 | 0 | 0
Benefits paid | 6,573 | 1,007 | 1,242
Adjustments | 0 | 0 | 0
Ending balance | (39,466) | (28,195) | (22,568)
Past service cost | (457) |  |
Curtailment / Settlement | 2,026 |  |
Actuarial changes arising from changes in demographic assumptions | (11,285) |  |
Fair value of assets [member] |  |  |
Disclosure of net defined benefit asset (liability) [line items] |  |  |
Beginning balance | 29,086 | 28,339 | 23,794
Current service cost | 0 | 0 | 0
Interest (cost) income | 731 | 979 | 666
Return on plan assets | 374 |  | 483
Experience (loss) gain | 0 | 0 | 0
Investment return |  | 138 | 67
Actuarial changes arising from changes in financial assumptions | 0 | 0 | 0
Employer contributions | 1,709 | 1,903 | 4,780
Benefits paid | (6,117) | (1,086) | (1,451)
Adjustments | 0 | (1,187) | 0
Ending balance | 25,783 | 29,086 | 28,339
Past service cost | 0 |  |
Curtailment / Settlement | 0 |  |
Actuarial changes arising from changes in demographic assumptions | 0 |  |
Other employee benefits liability [member] |  |  |
Disclosure of net defined benefit asset (liability) [line items] |  |  |
Beginning balance | (642) | (680) | (612)
Current service cost | 0 | 0 | 0
Interest (cost) income | 0 | 0 | 0
Return on plan assets | 0 |  | 0
Experience (loss) gain | 0 | 0 | 0
Investment return |  | 0 | 0
Actuarial changes arising from changes in financial assumptions | 0 | 0 |
Employer contributions | 0 | 0 | 0
Benefits paid | 0 | 0 | 0
Adjustments | (7) | 38 | (68)
Ending balance | (649) | $ (642) | $ (680)
Past service cost | 0 |  |
Curtailment / Settlement | 0 |  |
Actuarial changes arising from changes in demographic assumptions | $ 0 |  |

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- Definition Benefits paid, net defined benefit liability (asset). + References No definition available. + Details
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- Definition Experience gain (loss), net defined benefit liability (asset). + References No definition available. + Details
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- Definition Investment return, net defined benefit liability (asset). + References No definition available. + Details
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- Definition Withdrawals from plan by employer net defined benefit liability asset. + References No definition available. + Details
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- Definition The decrease (increase) in a net defined benefit liability (asset) resulting from actuarial gains (losses) arising from changes in demographic assumptions that result in remeasurements of the net defined benefit liability (asset). Demographic assumptions deal with matters such as: (a) mortality; (b) rates of employee turnover, disability and early retirement; (c) the proportion of plan members with dependants who will be eligible for benefits; (d) the proportion of plan members who will select each form of payment option available under the plan terms; and (e) claim rates under medical plans. [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 141 -Subparagraph c -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_141_c_ii&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The increase (decrease) in the net defined benefit liability (asset) resulting from employee service in the current period. [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 141 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_141_a&doctype=Standard -URIDate 2020-01-01 + Details
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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. + Details
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- Definition The decrease (increase) in the net defined benefit liability (asset) resulting from settlements. Settlements are transactions that eliminate all further legal or constructive obligations for part or all of the benefits provided under a defined benefit plan, other than a payment of benefits to, or on behalf of, employees that is set out in the terms of the plan and included in the actuarial assumptions. [Refer: Net defined benefit liability (asset); Defined benefit plans [member]; Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 141 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_141_d&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The increase (decrease) in the net defined benefit liability (asset) resulting from changes that the entity does not separately disclose in the same statement or note. [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 141 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_141&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The increase (decrease) in the net defined benefit liability (asset) resulting from the passage of time. [Refer: Interest expense; Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 141 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_141_b&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of deficit or surplus in a defined benefit plan, adjusted for any effect of limiting a net defined benefit asset to the asset ceiling. [Refer: Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 140 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_140_a&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The increase (decrease) in the net defined benefit liability (asset) resulting from past service cost. Past service cost is the change in the present value of the defined benefit obligation for employee service in prior periods, resulting from a plan amendment (the introduction or withdrawal of, or changes to, a defined benefit plan) or a curtailment (a significant reduction by the entity in the number of employees covered by a plan). [Refer: Net defined benefit liability (asset); Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 141 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_141_d&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The decrease (increase) in the net defined benefit liability (asset) resulting from the return on plan assets, excluding amounts included in interest income or expense. The return on plans assets is interest, dividends and other revenue derived from the plan assets, together with realised and unrealised gains or losses on the plan assets, less any costs of managing plan assets and less any tax payable by the plan itself, other than tax included in the actuarial assumptions used to measure the present value of the defined benefit obligation. [Refer: Plan assets [member]; Net defined benefit liability (asset); Actuarial assumptions [member]; Interest expense (income), net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 141 -Subparagraph c -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_141_c_i&doctype=Standard -URIDate 2020-01-01 + Details
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