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Employee Benefit - Significant Assumptions Used in Determining Actuarial Present Value of Defined Benefit Obligations (Detail)		12 Months Ended
		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

X

- Definition

Pre-retirement mortality.

+ References

No definition available.

+ Details

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X

- 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
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-URIDate 2018-03-16

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X

- 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

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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.

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