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Post-Retirement Obligation- Summary of Actuarial Assumptions (Detail) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of fair value of plan assets [abstract] |  |  |
Annual discount rate for present value of the actuarial obligation | 9.48% | 10.50% | 13.20%
Annual expected return on plan assets | 9.48% | 10.50% | 13.20%
Long-term annual inflation rate | 4.00% | 4.50% | 5.50%
Estimated future annual salary increases | 6.08% | 6.59% | 7.61%
General mortality table | AT-2000 D10 | AT-2000 | AT-2000
Disability table | Not adopted | Álvaro Vindas | Álvaro vindas
Disabled mortality table | AT 49 | AT 49 | AT 49

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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 inflation 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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- References No definition available. + Details
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- Definition Actuarial assumption annual expected return on plan assets. + References No definition available. + Details
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- Definition Actuarial assumption disability rate. + References No definition available. + Details
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- Definition Actuarial assumption disabled mortality rate. + References No definition available. + Details
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- Definition Actuarial assumption mortality rate. + References No definition available. + Details
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