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Assets Pledged as Collateral or for Security - Summary of Assets Pledged as Collateral or for Security (Detail) $ in Thousands, $ in Thousands	Dec. 31, 2020 TWD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 TWD ($)
Assets Pledged As Collateral or For Security [abstract]
Inventories related to real estate business	$ 10,564,873	$ 376,242	$ 6,063,303
Property, plant and equipment	124,124	4,420	138,831
Investment properties	11,847,145	421,907	12,167,772
Other financial assets (including current and non-current)	460,890	16,414	637,775
Total	$ 22,997,032	$ 818,983	$ 19,007,681

X

- Definition

Assets pledged as collateral or for security.

+ References

No definition available.

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- Definition

Investment properties pledged as security.

+ References

No definition available.

+ Details

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- Definition

The fair value of collateral held that is permitted to be sold or repledged in the absence of default by the owner of the collateral. [Refer: At fair value [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2020-01-01
-Paragraph 15
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_15_a&doctype=Standard
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X

- Definition

The amount of inventories pledged as security for liabilities. [Refer: Inventories]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 2
-IssueDate 2020-01-01
-Paragraph 36
-Subparagraph h
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- Definition

The amount of non-cash collateral assets (such as debt or equity instruments) provided to a transferee, for which the transferee has the right by contract or custom to sell or repledge the collateral.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 9
-IssueDate 2020-01-01
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-URIDate 2020-01-01

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Note Expiry date 2021-01-01
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-Number 39
-IssueDate 2020-01-01
-Paragraph 37
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- Definition

The amount of property, plant and equipment pledged as security for liabilities. [Refer: Property, plant and equipment]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Number 16
-IssueDate 2020-01-01
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