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Profit Before Income Tax - Summary of Finance Costs (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2020
TWD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
TWD ($)
Dec. 31, 2018
TWD ($)
Analysis of income and expense [abstract]        
Interest on lease liabilities $ 88,026 $ 3,135 $ 88,742  
Interest on borrowings and bonds payable 3,498,999 124,608 4,211,541 $ 3,597,932
Total interest expense for financial liabilities measured at amortized cost 3,587,025 127,743 4,300,283 3,597,932
Less: Amounts included in the cost of qualifying assets        
Inventories related to real estate business (95,589) (3,404) (35,713) (11,648)
Property, plant and equipment (54,208) (1,930) (77,715) (50,309)
Investment properties       (89)
Interest expense 3,437,228 122,409 4,186,855 3,535,886
Other finance costs 22,283 793 16,540 32,355
Finance costs $ 3,459,511 $ 123,202 $ 4,203,395 $ 3,568,241