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Investment Properties - Additional Information (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2020
TWD ($)
Dec. 31, 2020
USD ($)
Disclosure of detailed information about investment property [line items]    
Adjustment to rent income $ 54,139 $ 1,928
Bottom of range [member]    
Disclosure of detailed information about investment property [line items]    
Operating lease Term 1 year 1 year
Top of range [member]    
Disclosure of detailed information about investment property [line items]    
Operating lease Term 15 years 15 years