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Investments Accounted for Using the Equity Method - Summary of Aggregate Information of Associates that are Not Individually Material (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2020
TWD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
TWD ($)
Dec. 31, 2018
TWD ($)
Disclosure of associates and joint ventures [line items]        
Net profit $ 28,651,900 $ 1,020,366 $ 18,268,565 $ 27,424,309
Other comprehensive income (loss) 495,313 17,640 (4,370,611) (852,632)
Total comprehensive income (loss) 29,147,213 1,038,006 13,897,954 26,571,677
Associates that are not individually material [member]        
Disclosure of associates and joint ventures [line items]        
Net profit 545,833 19,438 321,413 147,535
Other comprehensive income (loss) 2,784,094 99,149 1,401,453 (613,471)
Total comprehensive income (loss) $ 3,329,927 $ 118,587 $ 1,722,866 $ (465,936)