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Employee Benefit - Significant Assumptions Used in Determining Actuarial Present Value of Defined Benefit Obligations (Detail) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Disclosure Of Net Defined Benefit Liability Asset [Line Items] |  |  |
Actuarial assumption of discount rates |  |  | 2.70%
Pre-retirement mortality | [1] | Thailand TMO17 Tables* | Thailand TMO17 Tables*
Bottom of range [Member] |  |  |
Disclosure Of Net Defined Benefit Liability Asset [Line Items] |  |  |
Actuarial assumption of discount rates |  | 2.60% |
Actuarial assumption of expected rates of salary increases |  | 5.00% | 5.00%
Top of range [Member] |  |  |
Disclosure Of Net Defined Benefit Liability Asset [Line Items] |  |  |
Actuarial assumption of discount rates |  | 2.70% |
Actuarial assumption of expected rates of salary increases |  | 6.00% | 6.00%
[1] | TMO represented as Thailand Mortality Ordinary Tables

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- Definition Pre-retirement mortality. + 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 2018-01-01 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_144&doctype=Standard -URIDate 2018-03-16 + 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 2018-01-01 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_144&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Details
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- Details
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