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Net Employee Defined Benefit Liability - Summary of Principal Assumptions Used In Determining Pension Benefit Obligations (Detail) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Disclosure of sensitivity analysis for actuarial assumptions [abstract] |  |
Discount rate | 2.47% | 2.68%
Rate of increase in salaries | 3.51% | 4.50%
Rate of inflation, pre-retirement | 2.40% | 2.45%
Rate of increase in future pensions payment | 3.53% | 3.58%
Life expectancy at age 65 for current pensioners: |  |
Male | 22 years | 22 years
Female | 24 years | 24 years
Life expectancy at age 65 for current members aged 40: |  |
Male | 23 years | 24 years
Female | 26 years | 26 years

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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 increases in pension that is 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 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 Life expectancy at age sixty five for current members aged forty. + References No definition available. + Details
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