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Finance Costs - Summary of Finance Costs (Detail) $ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020 TWD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 TWD ($)	Dec. 31, 2018 TWD ($)
Analysis of Finance Costs [abstract]
Bank loans	$ 158,720		$ 171,840	$ 170,476
Lease liabilities	13,442		14,349
Lease obligations payable				482
Less: Amounts capitalized in qualifying assets	(9,762)		(15,114)	(18,542)
Interest expense	162,400		171,075	152,416
Finance expense	9,082		9,187	37,832
Finance costs	$ 171,482	$ 6,107	$ 180,262	$ 190,248

X

- Definition

The amount of costs associated with financing activities of the entity.

+ References

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- Definition

The amount of interest costs that an entity incurs in connection with the borrowing of funds that are directly attributable to the acquisition, construction or production of a qualifying asset and which form part of the cost of that asset.

+ References

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- Definition

The amount of expense arising from interest.

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- Definition

The amount of interest expense on bank loans and overdrafts. [Refer: Interest expense; Bank overdrafts]

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The amount of interest expense on lease liabilities. [Refer: Lease liabilities]

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- Definition

The amount of finance costs that the entity does not separately disclose in the same statement or note. [Refer: Finance costs]

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Analysis of Finance Costs [abstract]

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Interest expense on lease liabilities other than lease obligations.

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