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Goodwill - Summary of Goodwill (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2022
TWD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
TWD ($)
Dec. 31, 2020
TWD ($)
Disclosure of reconciliation of changes in goodwill [line items]        
Beginning balance $ 52,072,413 $ 1,694,514 $ 52,709,053 $ 50,198,436
Acquisition through business combinations       2,567,842
Disposal of subsidiaries     (310,711)  
Effect of foreign currency exchange differences 240,986 7,842 (325,929) (57,225)
Ending balance 52,313,399 1,702,356 52,072,413 52,709,053
Cost [member]        
Disclosure of reconciliation of changes in goodwill [line items]        
Beginning balance 54,486,526 1,773,073 55,123,166 52,612,549
Acquisition through business combinations       2,567,842
Disposal of subsidiaries     (310,711)  
Effect of foreign currency exchange differences 240,986 7,842 (325,929) (57,225)
Ending balance 54,727,512 1,780,915 54,486,526 55,123,166
Accumulated impairment [Member]        
Disclosure of reconciliation of changes in goodwill [line items]        
Beginning balance 2,414,113 78,559 2,414,113 2,414,113
Ending balance $ 2,414,113 $ 78,559 $ 2,414,113 $ 2,414,113