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Financial Assets at Fair Value Through Other Comprehensive Income - Additional Information (Detail) - TWD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Financial assets at fair value through other comprehensive income [abstract] |  |  |
Proceeds from sale of shares | $ 561,600 | $ 628,700 | $ 10
Unrealized gain (loss) on investments in equity instruments at fair value through other comprehensive income | 303,200 | 186,000 | $ (109,000)
Cumulative loss allowance for expected credit loss | $ 37,800 | $ 33,200 |

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- Definition The cash inflow from issuing shares. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 7 -IssueDate 2022-03-24 -Paragraph 17 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2022-en-r&anchor=para_17_a&doctype=Standard -URIDate 2022-03-24 + Details
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- Definition Unrealized gains/losses on equity securities at fair value through other comprehensive income + References No definition available. + Details
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