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Defined benefit plans - Summary of Principal Actuarial Assumptions (Detail)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Greece [member] | Defined Benefit Pension Plans [member]
Disclosure of defined benefit plans [line items]
Discount rate - beginning of year	1.70%	1.60%
Discount rate - end of year	1.70%	1.70%
Rate of salary escalation	2.80%	2.80%
Turkey [member] | Defined Benefit Pension Plans [member]
Disclosure of defined benefit plans [line items]
Discount rate - beginning of year	11.00%	10.50%
Discount rate - end of year	15.00%	11.00%
Rate of salary escalation	9.00%	6.50%
Canada [member] | Defined Benefit Pension Plans [member]
Disclosure of defined benefit plans [line items]
Expected return on plan assets	3.40%	3.90%
Discount rate - beginning of year	3.40%	3.90%
Discount rate - end of year	3.90%	3.40%
Rate of salary escalation	2.00%	2.00%
Average remaining service period of active employees expected to receive benefits	1 year 7 months 6 days	8 years 2 months 12 days
Canada [member] | Supplemental pension plan [member]
Disclosure of defined benefit plans [line items]
Expected return on plan assets	3.40%	3.90%
Discount rate - beginning of year	3.40%	3.90%
Discount rate - end of year	3.90%	3.40%
Rate of salary escalation	2.00%	2.00%
Average remaining service period of active employees expected to receive benefits	1 year 7 months 6 days	8 years 2 months 12 days

X

- Definition

Actuarial assumption of expected return on plan assets.

+ References

No definition available.

+ Details

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X

- Definition

Weighted Average Duration of Defined Benefit Obligations

+ References

No definition available.

+ Details

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X

- Definition

The discount rate used as the significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit obligation, at present value; Actuarial assumptions [member]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 19
-IssueDate 2018-01-01
-Paragraph 144
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_144&doctype=Standard
-URIDate 2018-03-16

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X

- Definition

The expected rate of salary increases used as a significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit plans [member]; Defined benefit obligation, at present value; Actuarial assumptions [member]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 19
-IssueDate 2018-01-01
-Paragraph 144
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_144&doctype=Standard
-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.

+ Details

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