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Trade Receivables, Net - Summary of Movements of Loss Allowance of Trade Receivables (Detail) - Trade receivables [member] $ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021 TWD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 TWD ($)	Dec. 31, 2019 TWD ($)
Disclosure of financial assets [Line Items]
Beginning balance	$ 97,358	$ 3,510	$ 136,497	$ 155,389
Net remeasurement of loss allowance	17,078	616	(55,742)	(38,277)
Reclassification	0	0	(6,970)	(5,877)
Acquisition through business combinations	0	0	32,460	25,553
Amounts written off	(399)	(14)	(3,944)	0
Disposal of subsidiaries	(4,637)	(167)
Effects of foreign currency exchange differences	(6,047)	(219)	(4,943)	(291)
Ending balance	$ 103,353	$ 3,726	$ 97,358	$ 136,497

X

- Definition

Disposal of subsidiaries of allowance on trade receivable.

+ References

No definition available.

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- Definition

Increase (decrease) through acquisition through business combinations, allowance account for credit losses of financial assets.

+ References

No definition available.

+ Details

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X

- Definition

Increase (decrease) through Net remeasurement of loss allowance, allowance account for credit losses of financial assets.

+ References

No definition available.

+ Details

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- Definition

Reclassification to loss allowance of other receivables.

+ References

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- Definition

The amount of an allowance account used to record impairments to financial assets due to credit losses. [Refer: Financial assets]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Expiry date 2023-01-01
-Name IFRS
-Number 7
-IssueDate 2021-01-01
-Paragraph 16
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_16&doctype=Standard&book=b
-URIDate 2021-03-24

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

+ References

No definition available.

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- Definition

The increase (decrease) in an allowance account for credit losses of financial assets resulting from the net exchange differences arising when the financial statements are translated from the functional currency into a different presentation currency, including the translation of a foreign operation into the presentation currency of the reporting entity. [Refer: Allowance account for credit losses of financial assets]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Note Expiry date 2023-01-01
-Name IFRS
-Number 7
-IssueDate 2021-01-01
-Paragraph 16
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_16&doctype=Standard&book=b
-URIDate 2021-03-24

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- Definition

The decrease in an allowance account for credit losses of financial assets resulting from the utilisation of the allowance. [Refer: Allowance account for credit losses of financial assets]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Note Expiry date 2023-01-01
-Name IFRS
-Number 7
-IssueDate 2021-01-01
-Paragraph 16
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_16&doctype=Standard&book=b
-URIDate 2021-03-24

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