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Equity - Summary of Capital Surplus (Detail)
$ in Thousands, $ in Thousands
Dec. 31, 2020
TWD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
TWD ($)
Disclosure of classes of share capital [abstract]      
Issuance of ordinary shares $ 13,548,426 $ 482,494 $ 13,070,330
Merger by share exchange 117,693,658 4,191,369 117,693,658
Difference between consideration and the carrying amount of the subsidiaries' net assets during actual disposal or acquisition 3,240,987 115,420 3,254,489
Capital surplus deficit distributed as cash dividends 134,483,071 4,789,283 134,018,477
Changes in percentage of ownership interest in subsidiaries 1,451 52 891,876
Treasury share transactions 510,449 18,178 364,708
Exercised employee share options 1,617,254 57,595 1,443,995
Expired share options (Notes 22 and 29) 645,903 23,002 645,903
Share of changes in capital surplus of associates 41,239 1,469 16,266
Dividends that the claim period has elapsed and unclaimed by shareholders 3,550 126 1,942
Capital surplus offset deficit 2,819,846 100,422 3,364,690
Employee share options 1,894,952 67,484 1,304,250
Others 569,681 20,288 222,946
Capital surplus for other purpose 2,464,633 87,772 1,527,196
Capital surplus $ 139,767,550 $ 4,977,477 $ 138,910,363