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Non-Current Provisions - Schedule of Retirement Commitments (Detail) | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
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Disclosure of sensitivity analysis for actuarial assumptions [abstract] |  |  |
% social security contributions | 50.00% | 50.00% | 50.00%
Salary increases | 2.00% | 2.00% | 2.00%
Discount rate | 1.30% | 1.31% | 2.08%

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- Definition Actuarial assumption of social security contributions. + 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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- References No definition available. + Details
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