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Basis of Presentation of Financial Statements and Principal Accounting Policies - Additional Information (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2019
TWD ($)
Dec. 31, 2019
USD ($)
Jan. 01, 2019
TWD ($)
Disclosure of detailed information about basis of presentation of financial statements and principal accounting policies [line items]      
Right-of-use asset $ 687,068 $ 22,971  
Lease liability 692,951    
Rent Expense $ 28,126    
Bottom of range [member]      
Disclosure of detailed information about basis of presentation of financial statements and principal accounting policies [line items]      
Incremental borrowing interest rate     1.7895%
Top of range [member]      
Disclosure of detailed information about basis of presentation of financial statements and principal accounting policies [line items]      
Incremental borrowing interest rate     3.9474%
Effects of adopting new standards [member]      
Disclosure of detailed information about basis of presentation of financial statements and principal accounting policies [line items]      
Right-of-use asset     $ 898,387
Lease liability     884,275
Lease assets     31,904
Lease obligations payable     $ 17,792