Defined benefit plans - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Disclosure of defined benefit plans [line items]
Refundable tax of percentage of gain on defined benefit pension plans	50.00%
Actual return on plan assets	$ 685	$ 1,416
Plan assets [member]
Disclosure of defined benefit plans [line items]
Contributions by employer	0	1,415
Benefit payments	4,182	1,542
Defined Benefit Pension Plans [member] \| Plan assets [member]
Disclosure of defined benefit plans [line items]
Contributions by employer	0	219
Supplemental pension plan [member] \| Plan assets [member]
Disclosure of defined benefit plans [line items]
Contributions by employer	0	$ 1,196
Canadian Pension Plan [member] \| Defined Benefit Pension Plans [member]
Disclosure of defined benefit plans [line items]
Contributions by employer	$ 31

Payments Made To Beneficiaries, Net Defined Benefit Liability (Asset)

No definition available.

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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 2018-01-01
-Paragraph 141
-Subparagraph f
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_141_f&doctype=Standard
-URIDate 2018-03-16

+ 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 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 2018-01-01
-Paragraph 141
-Subparagraph c
-Clause i
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_141_c_i&doctype=Standard
-URIDate 2018-03-16

+ Details

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- Details

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- Details

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- Details

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- Details

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