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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, 2024
TWD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
TWD ($)
Disclosure of detailed information about financial instruments [line items]      
Financial assets at fair value through profit or loss, current $ 606,018 $ 18,482 $ 443,601
Financial assets at fair value through profit or loss, noncurrent 17,850,914 544,401 16,694,860
Financial assets at fair value through other comprehensive income, current 5,893,377 179,731 5,753,379
Financial assets at fair value through other comprehensive income, noncurrent 11,315,951 345,104 11,930,581
Financial liabilities at fair value through profit or loss, current 901,000 $ 27,478 1,019,362
Level 1 [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial assets at fair value through profit or loss, current 606,016   443,601
Financial assets at fair value through profit or loss, noncurrent 5,703,325   6,424,475
Financial assets at fair value through other comprehensive income, current 5,893,377   5,753,379
Financial assets at fair value through other comprehensive income, noncurrent 7,879,553   8,693,193
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 2   0
Financial assets at fair value through profit or loss, noncurrent 18,800   19,300
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 1,039   0
Level 3 [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 12,128,789   10,251,085
Financial assets at fair value through other comprehensive income, current 0   0
Financial assets at fair value through other comprehensive income, noncurrent 3,436,398   3,237,388
Financial liabilities at fair value through profit or loss, current $ 899,961   $ 1,019,362