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Investments Accounted for Using the Equity Method - Summary of Aggregate Information of the Joint Venture that is Not Individually Material (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2021
TWD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
TWD ($)
Dec. 31, 2019
TWD ($)
Disclosure of joint ventures [line items]        
Net income (loss) $ 62,249,997 $ 2,244,050 $ 28,651,900 $ 18,268,565
Other comprehensive income (loss) 406,016 14,637 495,313 (4,370,611)
Total comprehensive income (loss) 62,656,013 2,258,687 29,147,213 13,897,954
Joint venture that is not individually material [member]        
Disclosure of joint ventures [line items]        
Net income (loss) 27,003 973 1,780 (139,137)
Other comprehensive income (loss)     3,881 (3,169)
Total comprehensive income (loss) $ 27,003 $ 973 $ 5,661 $ (142,306)