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Defined benefit plans - Additional Information (Detail) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) Pension_Plan | Dec. 31, 2016 USD ($)
Disclosure of defined benefit plans [line items] |  |  |
Number of defined benefit pension plans | Pension_Plan |  | 2 |
Refundable tax of percentage of gain on defined benefit pension plans |  | 50.00% |
Actual return on plan assets |  | $ 1,416 | $ 3,801
Plan assets [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Contributions by employer |  | 1,415 | 1,728
Benefit payments |  | (1,542) | (471)
Defined Benefit Pension Plans [member] | Plan assets [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Contributions by employer |  | 219 |
Benefit payments |  | (57) | (26)
Supplemental pension plan [member] | Plan assets [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Contributions by employer |  | 1,196 | 1,728
Benefit payments |  | $ (1,485) | $ (445)
Canadian Pension Plan [member] | Defined Benefit Pension Plans [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Contributions by employer | $ 67 |  |
Canadian Pension Plan [member] | Supplemental pension plan [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Contributions by employer | $ 510 |  |

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- Definition Number of defined benefit plans. + References No definition available. + Details
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- Definition Refundable tax of percentage of gain on defined benefit pension plans. + References No definition available. + Details
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- Definition The decrease (increase) in net defined benefit liability (asset) resulting from contributions to a defined benefit plan by the employer. [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 2017-01-01 -Paragraph 141 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_141_f&doctype=Standard -URIDate 2017-03-09 + 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 payments from the plan in respect of settlements. [Refer: Gains (losses) arising from settlements, net defined benefit liability (asset); Net defined benefit liability (asset); Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 141 -Subparagraph g -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_141_g&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The decrease (increase) in the net defined benefit liability (asset) resulting from the return on plan assets. 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]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 141 -Subparagraph c -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_141_c_i&doctype=Standard -URIDate 2017-03-09 + Details
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- Details
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