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Employee Benefit - Significant Assumptions Used in Determining Actuarial Present Value of Defined Benefit Obligations (Detail)		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019
Disclosure Of Net Defined Benefit Liability Asset [Line Items]
Actuarial assumption of discount rates			1.50%
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		1.20%
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		1.40%
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 2020-01-01
-Paragraph 144
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-URIDate 2020-01-01

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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
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-Number 19
-IssueDate 2020-01-01
-Paragraph 144
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-URIDate 2020-01-01

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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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