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Financial Risk Management and Fair Values of Financial Instruments - Additional Information (Detail) - TWD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of detailed information about financial instruments [Line Items]      
Realized and unrealized gain and loss arising from significant foreign exchange variation $ 78,170 $ 448,097 $ (89,152)
Adjustments to interest rate 1.00% 1.00% 1.00%
General increase or decrease of 100 basis points (1%) in interest rates [member]      
Disclosure of detailed information about financial instruments [Line Items]      
Estimated decrease or increase in the Group's profit and equity based on an increase or decrease in the interest rates $ 149,723 $ 140,561 $ 102,489
Equity price risk [member]      
Disclosure of detailed information about financial instruments [Line Items]      
Estimated decrease or increase in the Group's profit and equity based on an increase or decrease in the interest rates $ 427 $ 1,282 $ 3,600
Percentage of increase or decrease in price of equity securities 1.00% 1.00% 1.00%