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Investments Accounted for Using the Equity Method - Summary of Investments Accounted for Using the Equity Method (Detail)
$ in Thousands, $ in Thousands
Dec. 31, 2020
TWD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
TWD ($)
Dec. 31, 2018
TWD ($)
Investments in subsidiaries, joint ventures and associates [abstract]        
Investments in associates $ 12,335,239 $ 439,289 $ 11,805,505  
Investments in joint ventures 471,434 16,789 279,702  
Investments accounted for using the equity method $ 12,806,673 $ 456,078 $ 12,085,207 $ 9,312,308