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Equity - Summary of Non-controlling Interests (Detail) $ in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 TWD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 TWD ($) | Dec. 31, 2019 TWD ($)
Balance at January 1 | $ 231,737,116 |  | $ 212,802,312 |
Share of profit for the year | 2,099,830 | $ 75,697 | 1,681,320 | $ 1,207,974
Other comprehensive income (loss) for the year |  |  |  |
Exchange difference on translating foreign operations | (4,094,565) | (147,605) | (831,784) | (5,202,145)
Share of other comprehensive income from associates accounted for using the equity method | 29,209 | 1,053 | 131,009 | (85,975)
Balance at December 31 | 268,171,060 | 9,667,306 | 231,737,116 | 212,802,312
Non-controlling interests [member] |  |  |  |
Balance at January 1 | 15,622,009 | 563,158 | 13,374,912 | 17,639,487
Share of profit for the year | 2,099,830 | 75,697 | 1,681,320 | 1,207,974
Other comprehensive income (loss) for the year |  |  |  |
Exchange difference on translating foreign operations | (321,551) | (11,592) | 178,480 | (414,010)
Unrealized gain (loss) on equity instruments at FVTOCI | 50,679 | 1,827 | 1,321 | (10,773)
Gain (Loss) from hedging | 187,502 | 6,759 | (145,559) |
Remeasurement on defined benefit plans | 1,497 | 54 | (9,075) | (7,422)
Share of other comprehensive income from associates accounted for using the equity method | 7,902 | 285 |  |
Non-controlling interests arising from acquisition or disposal of subsidiaries (Note 29) |  |  | 298 | 666,651
Acquisition of non-controlling interests in subsidiaries (Note 31) |  |  | (116,738) | (5,084,785)
Issuance of ordinary shares by subsidiaries (Note 29) |  |  | 1,711,453 | 83,044
Subsidiaries' buy back of their own outstanding ordinary shares (Note 31) | (2,748,521) | (99,081) | (2,299,533) | (2,017,319)
Equity component of convertible bonds issued by subsidiaries | 393,199 | 14,174 |  |
Non-controlling interest relating to outstanding vested employee share options granted by subsidiaries | 314,398 | 11,334 | 1,591,904 | 1,672,310
Cash dividends distributed to non-controlling interests | (1,062,529) | (38,303) | (346,774) | (360,245)
Balance at December 31 | $ 14,544,415 | $ 524,312 | $ 15,622,009 | $ 13,374,912

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