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Equity - Summary of Capital Surplus (Detail)
$ in Thousands, $ in Thousands
Dec. 31, 2018
USD ($)
Dec. 31, 2018
TWD ($)
Dec. 31, 2017
TWD ($)
Disclosure of classes of share capital [abstract]      
Issuance of ordinary shares $ 421,640 $ 12,906,401 $ 21,553,853
Merger by share exchange 3,844,942 117,693,658  
Conversion of bonds payable     1,930,066
Difference between consideration and the carrying amount of the subsidiaries' net assets during actual disposal or acquisition 197,128 6,034,102 7,176,958
Capital surplus deficit distributed as cash dividends 4,463,710 136,634,161 30,660,877
Changes in percentage of ownership interest in subsidiaries 121,768 3,727,336 6,084,895
Treasury share transactions 5,957 182,354 1,151,345
Exercised employee share options 44,642 1,366,480 1,089,178
Expired share options (Notes 22 and 29) 21,103 645,978 223,454
Share of changes in capital surplus of associates 2,847 87,136 83,733
Dividends that the claim period has elapsed and unclaimed by shareholders 29 872  
Capital surplus offset deficit 196,346 6,010,156 8,632,605
Employee share options 19,064 583,542 960,888
Equity component of convertible bonds     214,022
Others 1,594 48,805 155,936
Capital surplus for other purpose 20,658 632,347 1,330,846
Capital surplus $ 4,680,714 $ 143,276,664 $ 40,624,328