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Defined Benefit Plans - Summary of Principal Actuarial Assumptions (Detail) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Supplemental pension plan [member] |  |
Disclosure of defined benefit plans [line items] |  |
Expected return on plan assets |  | 3.90%
Discount rate - beginning of year | 3.90% | 4.00%
Discount rate - end of year |  | 3.90%
Rate of salary escalation |  | 2.00%
Average remaining service period of active employees expected to receive benefits |  | 7 years 1 month 6 days
Greece [member] | Defined Benefit Pension Plans [member] |  |
Disclosure of defined benefit plans [line items] |  |
Discount rate - beginning of year | 1.60% | 2.00%
Discount rate - end of year | 1.70% | 1.60%
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 | 10.50% | 10.50%
Discount rate - end of year | 11.00% | 10.50%
Rate of salary escalation | 6.50% | 6.00%
Canada [member] | Defined Benefit Pension Plans [member] |  |
Disclosure of defined benefit plans [line items] |  |
Expected return on plan assets | 3.90% | 3.90%
Discount rate - beginning of year | 3.90% | 4.00%
Discount rate - end of year | 3.40% | 3.90%
Rate of salary escalation | 2.00% | 2.00%
Average remaining service period of active employees expected to receive benefits | 8 years 2 months 12 days | 7 years 1 month 6 days
Canada [member] | Supplemental pension plan [member] |  |
Disclosure of defined benefit plans [line items] |  |
Expected return on plan assets | 3.90% |
Discount rate - beginning of year | 3.90% |
Discount rate - end of year | 3.40% | 3.90%
Rate of salary escalation | 2.00% |
Average remaining service period of active employees expected to receive benefits | 8 years 2 months 12 days |

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- Definition Actuarial assumption of expected return on plan assets. + References No definition available. + Details
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- Definition Weighted Average Duration of Defined Benefit Obligations + References No definition available. + Details
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- 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 2017-01-01 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_144&doctype=Standard -URIDate 2017-03-09 + Details
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- 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 2017-01-01 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_144&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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- Details
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- Details
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