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Leasing arrangements - leasee - Additional Information (Detail) - TWD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Leasing arrangements lessee [line items]      
Additions to right of use asset $ 292,117 $ 419,625  
Payments of lease liabilities $ 443,345 $ 351,063 $ 333,133
Machinery and equipment [member]      
Leasing arrangements lessee [line items]      
Lease term 3 years    
Top of range [member]      
Leasing arrangements lessee [line items]      
Lease term 30 years    
Top of range [member] | Land [member]      
Leasing arrangements lessee [line items]      
Lease term 30 years    
Bottom of range [member]      
Leasing arrangements lessee [line items]      
Lease term 2 years    
Bottom of range [member] | Land [member]      
Leasing arrangements lessee [line items]      
Lease term 20 years