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Leasing arrangements - leasee - Additional Information (Detail) - TWD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Statement [line items]      
Additions to right of use asset $ 433,768 $ 261,798  
Payments of lease liabilities $ 448,290 $ 274,727 $ 273,709
Top of range [member]      
Statement [line items]      
Lease term 30 years    
Bottom of range [member]      
Statement [line items]      
Lease term 1 year