v3.26.1
Goodwill - Summary of Goodwill (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2025
TWD ($)
Dec. 31, 2025
USD ($)
Dec. 31, 2024
TWD ($)
Dec. 31, 2023
TWD ($)
Disclosure of reconciliation of changes in goodwill [line items]        
Beginning balance $ 52,525,342 $ 1,674,381 $ 52,419,427 $ 52,313,399
Impairment losses recognized 132,778 4,233    
Acquisitions through business combinations       21,001
Effect of foreign currency exchange differences 149,341 4,761 105,915 85,027
Ending balance 52,541,905 1,674,909 52,525,342 52,419,427
Cost [member]        
Disclosure of reconciliation of changes in goodwill [line items]        
Beginning balance 54,939,455 1,751,337 54,833,540 54,727,512
Acquisitions through business combinations       21,001
Effect of foreign currency exchange differences 149,341 4,761 105,915 85,027
Ending balance 55,088,796 1,756,098 54,939,455 54,833,540
Accumulated impairment [Member]        
Disclosure of reconciliation of changes in goodwill [line items]        
Beginning balance 2,414,113 76,956 2,414,113 2,414,113
Impairment losses recognized 132,778 4,233    
Effect of foreign currency exchange differences 0 0    
Ending balance $ 2,546,891 $ 81,189 $ 2,414,113 $ 2,414,113