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Other equity interest - Summary of Other Equity Interest (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2023
TWD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
TWD ($)
Dec. 31, 2021
TWD ($)
Disclosure of Other Equity Interest [Line Items]        
Beginning balance $ 228,283      
Evaluation adjustment - The Company (217,785) $ (7,113) $ (46,419) $ 122,514
Ending balance 48,360 $ 1,579 228,283  
Financial statements translation differences of foreign operations [member]        
Disclosure of Other Equity Interest [Line Items]        
Beginning balance (17,369)   (86,025) (61,330)
Currency translation differences - The company 16,713   68,656 (24,695)
Ending balance (656)   (17,369) (86,025)
Unrealized gain (loss) on valuation of financial assets at fair value through other comprehensive income [member]        
Disclosure of Other Equity Interest [Line Items]        
Beginning balance 245,652   307,865 194,716
Evaluation adjustment - The Company (217,785)   (46,419) 122,514
Evaluation adjustment - Associates 12,605   (28,353) 21,094
Evaluation adjustment related tax - The Company 51,638   12,559 (30,459)
Ending balance 92,110   245,652 307,865
Equity directly related to non-current assets held for sale [member]        
Disclosure of Other Equity Interest [Line Items]        
Currency translation differences - Non-current assets held for sale (43,094)      
Ending balance (43,094)      
Other equity interest [member]        
Disclosure of Other Equity Interest [Line Items]        
Beginning balance 228,283   221,840 133,386
Currency translation differences - The company 16,713   68,656 (24,695)
Currency translation differences - Non-current assets held for sale (43,094)      
Evaluation adjustment - The Company (217,785)   (46,419) 122,514
Evaluation adjustment - Associates 12,605   (28,353) 21,094
Evaluation adjustment related tax - The Company 51,638   12,559 (30,459)
Ending balance $ 48,360   $ 228,283 $ 221,840