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Equity - Summary of Capital Surplus (Detail) $ in Thousands, $ in Thousands | Dec. 31, 2021 TWD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 TWD ($)
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Disclosure of classes of share capital [abstract] |  |  |
Issuance of ordinary shares | $ 16,049,286 | $ 578,561 | $ 13,548,426
Merger by share exchange | 117,693,658 | 4,242,742 | 117,693,658
Difference between consideration and the carrying amount of the subsidiaries' net assets during actual disposal or acquisition | 3,240,987 | 116,835 | 3,240,987
Exercised employee share options | 2,362,951 | 85,182 | 1,617,254
Treasury share transactions | 816,186 | 29,422 | 510,449
Expired share options (Note 28) | 645,903 | 23,284 | 645,903
Capital surplus deficit distributed as cash dividends | 140,808,971 | 5,076,026 | 137,256,677
Changes in percentage of ownership interest in subsidiaries | 1,451 | 52 | 1,451
Share of changes in capital surplus of associates | 10,706 | 386 | 41,239
Dividends that the claim period has elapsed and unclaimed by shareholders | 5,183 | 187 | 3,550
Capital surplus offset deficit | 17,340 | 625 | 46,240
Employee share options | 1,442,132 | 51,988 | 1,894,952
Employee restricted stock awards | 1,193,782 | 43,034 | 0
Others | 230,943 | 8,326 | 569,681
Capital surplus for other purpose | 2,866,857 | 103,348 | 2,464,633
Capital surplus | $ 143,693,168 | $ 5,179,999 | $ 139,767,550

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