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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, 2021 TWD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 TWD ($) | Dec. 31, 2019 TWD ($)
Financial assets at fair value through other comprehensive income [line items] |  |  |  |
Balance at January 1 | $ 1,741,134 |  |  |
Ending balance | 2,019,812 | $ 72,812 | $ 1,741,134 |
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 | 2,027,902 | 73,104 | (203,098) | $ (1,015,107)
Debt instruments | 63,722 | 2,297 | (2,136) | (2,052)
Equity instruments | (8,671) | (313) | (405,020) | (283,472)
Share from associates and joint venture accounted for using the equity method | 3,599,703 | 129,766 | 2,655,570 | 1,501,689
Disposal of associates and joint venture accounted for using the equity method |  |  | 1,094 |
Cumulative unrealized loss of equity instruments transferred to retained earnings due to disposal | 33,258 | 1,199 | 16,383 |
Cumulative unrealized loss transferred to retained earnings due to disposal of equity instruments in relation to associates and joint venture accounted for using the equity method | (1,525,553) | (54,995) | (34,891) | (404,156)
Ending balance | $ 4,190,361 | $ 151,058 | $ 2,027,902 | $ (203,098)

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