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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, 2023
Dec. 31, 2022
Disclosure assets pledged as collateral [Line Items]    
Purpose Lease and bank loan  
Non-current financial assets at amortized cost $ 37,411 $ 37,362
Assets pledged as collateral for liabilities $ 13,964,988 14,080,591
Land [member]    
Disclosure assets pledged as collateral [Line Items]    
Purpose Bank loan  
Property, plant and equipment, net $ 454,738 452,738
Buildings [member]    
Disclosure assets pledged as collateral [Line Items]    
Purpose Bank loan  
Property, plant and equipment, net $ 5,299,221 5,385,508
Machinery and equipment [member]    
Disclosure assets pledged as collateral [Line Items]    
Purpose Bank loan  
Property, plant and equipment, net $ 8,173,618 $ 8,204,983