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Profit Before Income Tax - Summary of Other Gains and Losses (Detail) $ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2021 TWD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 TWD ($) | Dec. 31, 2019 TWD ($)
Analysis of income and expense [abstract] |  |  |  |
Remeasurement gain on investments accounted for using the equity method due to step acquisition |  |  |  | $ 319,712
Net gain on financial assets mandatorily at FVTPL | $ 1,199,065 | $ 43,225 | $ 3,211,125 | 3,631,763
Net loss arising on financial instruments held for trading | (2,689,070) | (96,938) | (3,282,973) | (1,984,941)
Gain on disposal of subsidiaries (Note 30) | 17,340,418 | 625,105 | 802,753 |
Foreign exchange gain, net | 1,395,054 | 50,290 | 1,005,374 | 1,125,681
Gain recognized in bargain purchase transaction (Note 29) | 33,114 | 1,194 |  | 0
Gain (loss) on disposal of investments accounted for using the equity method | (67,482) | (2,433) | 91,297 |
Impairment loss on financial assets |  |  |  | (400,201)
Others |  |  |  | (8,025)
Other gains and losses | $ 17,211,099 | $ 620,443 | $ 1,827,576 | $ 2,683,989

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- Definition Gains losses on financial assets and liabilities at fair value through profit or loss classified as held for trading. + References No definition available. + Details
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- Definition Adjustments for gain (loss) on disposals investments in subsidiaries, joint ventures and associates to reconcile profit (loss) to net cash flow from (used in) operating activities. [Refer: Associates [member]; Joint ventures [member]; Subsidiaries [member]; Investments in subsidiaries, joint ventures and associates reported in separate financial statements; Profit (loss)] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2021-01-01 -Paragraph 20 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2021-en-r&anchor=para_20&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The amount of exchange differences recognised in profit or loss that arise from foreign currency transactions, excluding those arising on financial instruments measured at fair value through profit or loss in accordance with IFRS 9. [Refer: At fair value [member]; Financial instruments, class [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 21 -IssueDate 2021-01-01 -Paragraph 52 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=21&code=ifrs-tx-2021-en-r&anchor=para_52_a&doctype=Standard -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 35 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_35&doctype=Standard -URIDate 2021-03-24 + Details
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