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Non-Current Provisions - Additional Information (Detail) - yr | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
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Disclosure Of Noncurrent Provisions [Abstract] |  |  |
Retirement age of employee | 65 | 65 | 65

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- Definition Disclosure Of Noncurrent Provisions [Abstract] + References No definition available. + Details
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- Definition The retirement age used as a 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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