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Lease Arrangements - Additional Information (Detail)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
TWD ($)
Disclosure of detailed information about property, plant and equipment [line items]  
Minimum Lease Payments $ 785,295
Land [member] | Bottom of range [member]  
Disclosure of detailed information about property, plant and equipment [line items]  
Lease Term 1 year
Land [member] | Top of range [member]  
Disclosure of detailed information about property, plant and equipment [line items]  
Lease Term 69 years
Buildings [member] | Bottom of range [member]  
Disclosure of detailed information about property, plant and equipment [line items]  
Lease Term 1 year
Buildings [member] | Top of range [member]  
Disclosure of detailed information about property, plant and equipment [line items]  
Lease Term 31 years