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Goodwill - Summary of Goodwill (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2024
TWD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
TWD ($)
Dec. 31, 2022
TWD ($)
Disclosure of reconciliation of changes in goodwill [line items]        
Beginning balance $ 52,419,427 $ 1,598,641 $ 52,313,399 $ 52,072,413
Acquisitions through business combinations     21,001  
Effect of foreign currency exchange differences 105,915 3,230 85,027 240,986
Ending balance 52,525,342 1,601,871 52,419,427 52,313,399
Cost [member]        
Disclosure of reconciliation of changes in goodwill [line items]        
Beginning balance 54,833,540 1,672,264 54,727,512 54,486,526
Acquisitions through business combinations     21,001  
Effect of foreign currency exchange differences 105,915 3,230 85,027 240,986
Ending balance 54,939,455 1,675,494 54,833,540 54,727,512
Accumulated impairment [Member]        
Disclosure of reconciliation of changes in goodwill [line items]        
Beginning balance 2,414,113 73,623 2,414,113 2,414,113
Ending balance $ 2,414,113 $ 73,623 $ 2,414,113 $ 2,414,113