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Investment Properties - Additional Information (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2021
TWD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
TWD ($)
Disclosure of detailed information about investment property [line items]      
Adjustment to rent income $ 3,865 $ 139 $ 54,139
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 20 years 20 years