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Equity - Summary of Capital Surplus (Detail)
$ in Thousands, $ in Thousands
Dec. 31, 2019
TWD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
TWD ($)
Disclosure of classes of share capital [abstract]      
Issuance of ordinary shares $ 13,070,330 $ 436,989 $ 12,906,401
Merger by share exchange 117,693,658 3,934,927 117,693,658
Difference between consideration and the carrying amount of the subsidiaries' net assets during actual disposal or acquisition 3,254,489 108,809 6,034,102
Capital surplus deficit distributed as cash dividends 134,018,477 4,480,725 136,634,161
Changes in percentage of ownership interest in subsidiaries 891,876 29,819 3,727,336
Treasury share transactions 364,708 12,193 182,354
Exercised employee share options 1,443,995 48,278 1,366,480
Expired share options (Notes 22 and 29) 645,903 21,595 645,978
Share of changes in capital surplus of associates 16,266 544 87,136
Dividends that the claim period has elapsed and unclaimed by shareholders 1,942 65 872
Capital surplus offset deficit 3,364,690 112,494 6,010,156
Employee share options 1,304,250 43,606 583,542
Others 222,946 7,454 48,805
Capital surplus for other purpose 1,527,196 51,060 632,347
Capital surplus $ 138,910,363 $ 4,644,279 $ 143,276,664