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Equity - Summary of Unrealized Gain (Loss) on Financial Assets at FVTOCI (Detail) $ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2022 TWD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 TWD ($) | Dec. 31, 2020 TWD ($)
Financial assets at fair value through other comprehensive income [line items] |  |  |  |
Balance at January 1 | $ 2,019,812 |  |  |
Other comprehensive income for the year, net of income tax | 8,632,472 | $ 280,913 | $ 406,016 | $ 495,313
Ending balance | 1,542,271 | 50,188 | 2,019,812 |
Unrealized gain (loss) on financial assets at fair value through other comprehensive income [member] |  |  |  |
Financial assets at fair value through other comprehensive income [line items] |  |  |  |
Balance at January 1 | 4,190,361 | 136,361 | 2,027,902 | (203,098)
Unrealized gain (loss) recognized during the year Debt instruments | (16,746) | (545) | 63,722 | (2,136)
Equity instruments | (8,360) | (272) | (8,671) | (405,020)
Share from associates and joint ventures accounted for using the equity method | (2,928,173) | (95,287) | 3,599,703 | 2,655,570
Other comprehensive income for the year, net of income tax | (2,953,279) | (96,104) | 3,654,754 | 2,248,414
Disposal of associates and joint ventures accounted for using the equity method |  |  |  | 1,094
Cumulative unrealized loss of equity instruments transferred to retained earnings due to disposal | 190,500 | 6,199 | 33,258 | 16,383
Cumulative unrealized gain transferred to retained earnings due to disposal of equity instruments in relation to associates and joint venture accounted for using the equity method | (152,077) | (4,949) | (1,525,553) | (34,891)
Ending balance | $ 1,275,505 | $ 41,507 | $ 4,190,361 | $ 2,027,902

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