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Leasing arrangements - leasee - summary of carrying amount of right-of-use assets and the depreciation expenses (Detail) $ in Thousands, $ in Thousands | 12 Months Ended |
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Dec. 31, 2020 TWD ($) | Dec. 31, 2019 TWD ($) | Dec. 31, 2020 USD ($)
Disclosure of quantitative information about right-of-use assets [line items] |  |  |
Carrying amount | $ 859,069 | $ 687,068 | $ 30,594
Depreciation expenses | 76,526 | 36,099 |
Land [member] |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |
Carrying amount | 636,261 | 669,967 |
Depreciation expenses | 20,938 | 22,657 |
Buildings [member] |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |
Carrying amount | 19,044 | 15,043 |
Depreciation expenses | 7,819 | 7,113 |
Machinery and equipment [member] |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |
Carrying amount | 203,249 |  |
Depreciation expenses | 46,225 | 4,520 |
Others [member] |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |
Carrying amount | 515 | 2,058 |
Depreciation expenses | $ 1,544 | $ 1,809 |

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- Definition The amount of depreciation of right-of-use assets. [Refer: Depreciation and amortisation expense; Right-of-use assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2020-01-01 -Paragraph 53 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2020-en-r&anchor=para_53_a&doctype=Standard -URIDate 2020-01-01 + Details
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Period Type: | duration

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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. + Details
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- Definition The amount of assets that represent a lessee's right to use an underlying asset for the lease term. Underlying asset is an asset that is the subject of a lease, for which the right to use that asset has been provided by a lessor to a lessee. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2020-01-01 -Paragraph 53 -Subparagraph j -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2020-en-r&anchor=para_53_j&doctype=Standard -URIDate 2020-01-01 + Details
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- Details
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- Details
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- Details
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- Details
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