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Employees' Leaving Entitlement - Summary of Assumptions Used in Determining Present Value of Defined Benefit Obligation Related to Employee Benefit Obligation (Detail) |  | 12 Months Ended
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Jan. 01, 2017 | Dec. 31, 2018 | Dec. 31, 2017
Actuarial assumption of discount rates [member] |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |  |
Annual rate | 1.31% | 1.57% | 1.30%
Actuarial assumption of expected rates of salary increases [member] |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |  |
Annual rate | 0.00% | 0.00% | 0.00%
Actuarial assumption of expected rates of inflation [member] |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |  |
Annual rate | 1.50% | 1.50% | 1.50%
Actuarial assumption of expected rates of pension increases [member] |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |  |
Annual rate | 2.625% | 2.625% | 2.625%
Actuarial assumption of mortality rates [member] |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |  |
Actuarial Assumption | RG48 mortality tables published by the General State Accounting | RG48 mortality tables published by the General State Accounting | RG48 mortality tables published by the General State Accounting
Actuarial assumption of inability rates [member] |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |  |
Actuarial Assumption | National Institute for Social Security tables, by age and sex | National Institute for Social Security tables, by age and sex | National Institute for Social Security tables, by age and sex
Actuarial assumption of retirement age [member] |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |  |
Actuarial Assumption | 100% upon achievement of AGO requisites | 100% upon achievement of AGO requisites | 100% upon achievement of AGO requisites
Actuarial assumption frequency of turnover [member] |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |  |
Annual rate | 4.00% | 4.00% | 4.00%
Actuarial assumption frequency of defined benefit obligation [member] |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |  |
Annual rate | 2.00% | 2.00% | 2.00%

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- Definition The description of the methods and assumptions used when preparing a sensitivity analysis for significant actuarial assumptions. [Refer: Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2018-01-01 -Paragraph 145 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_145_b&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The reasonably possible percentage of the increase in the actuarial assumption used to determine the present value of defined benefit obligation. [Refer: Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2018-01-01 -Paragraph 145 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_145_a&doctype=Standard -URIDate 2018-03-16 + Details
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