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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, 2019 TWD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 TWD ($)
Assets Pledged As Collateral or For Security [abstract]
Inventories related to real estate business	$ 6,063,303	$ 202,718	$ 4,796,126
Property, plant and equipment	138,831	4,642
Investment properties	12,167,772	406,813	6,680,017
Long-term prepayments for lease			6,515,576
Other financial assets (including current and non-current)	637,775	21,323	496,902
Total	$ 19,007,681	$ 635,496	$ 18,488,621

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- 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.

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- Definition

Non Current Land Use Rights

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No definition available.

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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 2019-01-01
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- 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 2019-01-01
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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
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-IssueDate 2019-01-01
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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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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