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Equity - Summary of Exchange Differences on Translating Foreign Operations (Detail) $ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2021 TWD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 TWD ($) | Dec. 31, 2019 TWD ($)
Balance at January 1 | $ 231,737,116 |  | $ 212,802,312 |
Exchange differences arising on translating foreign operations | (4,094,565) | $ (147,605) | (831,784) | $ (5,202,145)
Share from associates and joint venture 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
Exchange differences on translating foreign operations [member] |  |  |  |
Balance at January 1 | (11,641,939) | (419,681) | (10,762,684) | (5,888,574)
Exchange differences arising on translating foreign operations | (3,203,730) | (115,491) | (1,173,204) | (4,788,135)
Share from associates and joint venture accounted for using the equity method | 21,307 | 768 | 101,038 | (85,975)
Disposal of associates and joint venture accounted for using the equity method |  |  | 29,971 |
Disposal of foreign operations | (569,284) | (20,522) | 162,940 |
Balance at December 31 | $ (15,393,646) | $ (554,926) | $ (11,641,939) | $ (10,762,684)

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