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Disposal of Subsidiaries - Summary of Gain on Disposal of Subsidiaries (Detail) $ in Thousands, $ in Thousands | 1 Months Ended | 12 Months Ended
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Sep. 30, 2020 TWD ($) | Dec. 31, 2021 TWD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 TWD ($)
Disclosure of gain from disposals of subsidiaries [line items] |  |  |  |
Total consideration | $ 966,000 |  |  |
SPIL Cayman Holdings Limited [member] |  |  |  |
Disclosure of gain from disposals of subsidiaries [line items] |  |  |  |
Total consideration | $ 4,078,844 | $ 36,939,133 | $ 1,331,620 | $ 4,078,844
Net assets disposed of |  | (20,167,999) | (727,037) | (3,113,151)
Reclassification of accumulated exchange difference from equity to profit or loss due to the loss of control |  | 569,284 | 20,522 | (162,940)
Gain on disposal of |  | $ 17,340,418 | $ 625,105 | $ 802,753

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- Definition Gain on disposal of subsidiaries. + References No definition available. + Details
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- Definition Reclassification of Subsidiaries Net Assets From Equity to Accumulated Difference of Profit Due to The Loss Of Control Subsidiaries. + References No definition available. + Details
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- Definition The amount of assets, other than cash or cash equivalents, in subsidiaries or other businesses over which control is obtained or lost. [Refer: Subsidiaries [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2021-01-01 -Paragraph 40 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2021-en-r&anchor=para_40_d&doctype=Standard -URIDate 2021-03-24 + Details
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