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Pledged assets - Certain Assets Provided as Collateral Mainly for Long-term Bank Loans and Leases (Detail) - TWD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure assets pledged as collateral [Line Items]    
Purpose Lease  
Non-current financial assets at amortized cost $ 43,034 $ 37,411
Assets pledged as collateral for liabilities $ 13,393,118 13,964,988
Land [member]    
Disclosure assets pledged as collateral [Line Items]    
Purpose Bank loan  
Property, plant and equipment, net $ 454,738 454,738
Buildings [member]    
Disclosure assets pledged as collateral [Line Items]    
Purpose Bank loan  
Property, plant and equipment, net $ 5,722,487 5,299,221
Machinery and equipment [member]    
Disclosure assets pledged as collateral [Line Items]    
Purpose Bank loan  
Property, plant and equipment, net $ 7,172,859 $ 8,173,618