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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 ($)
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