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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, 2019
TWD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
TWD ($)
Dec. 31, 2017
TWD ($)
Investments in subsidiaries, joint ventures and associates [abstract]        
Investments in associates $ 11,805,505 $ 394,701 $ 9,131,814  
Investments in joint ventures 279,702 9,351 180,494  
Investments accounted for using the equity method $ 12,085,207 $ 404,052 $ 9,312,308 $ 48,753,751