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Financial Risk and Fair Value Disclosures - Assets and Liabilities Measured and Recorded at Fair Value on a Recurring Basis (Detail)
$ in Thousands, $ in Thousands
Dec. 31, 2023
TWD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
TWD ($)
Disclosure of detailed information about financial instruments [line items]      
Financial assets at fair value through profit or loss, current $ 443,601 $ 14,487 $ 705,918
Financial assets at fair value through profit or loss, noncurrent 16,694,860 545,227 17,784,651
Financial assets at fair value through other comprehensive income, current 5,753,379 187,896 3,213,057
Financial assets at fair value through other comprehensive income, noncurrent 11,930,581 389,634 11,976,543
Financial liabilities at fair value through profit or loss, current 1,019,362 $ 33,291 438,397
Level 1 [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets at fair value through profit or loss, current 443,601   669,444
Financial assets at fair value through profit or loss, noncurrent 6,424,475   6,626,088
Financial assets at fair value through other comprehensive income, current 5,753,379   3,213,057
Financial assets at fair value through other comprehensive income, noncurrent 8,693,193   8,366,276
Financial liabilities at fair value through profit or loss, current 0   0
Level 2 [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets at fair value through profit or loss, current 0   0
Financial assets at fair value through profit or loss, noncurrent 19,300   468,164
Financial assets at fair value through other comprehensive income, current 0   0
Financial assets at fair value through other comprehensive income, noncurrent 0   0
Financial liabilities at fair value through profit or loss, current 0   0
Level 3 [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets at fair value through profit or loss, current 0   36,474
Financial assets at fair value through profit or loss, noncurrent 10,251,085   10,690,399
Financial assets at fair value through other comprehensive income, current 0   0
Financial assets at fair value through other comprehensive income, noncurrent 3,237,388   3,610,267
Financial liabilities at fair value through profit or loss, current $ 1,019,362   $ 438,397