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Profit Before Income Tax - Summary of Finance Costs (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2019
TWD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
TWD ($)
Dec. 31, 2017
TWD ($)
Analysis of income and expense [abstract]        
Interest on lease liabilities $ 88,742 $ 2,967    
Total interest expense for financial liabilities measured at amortized cost 4,211,541 140,807 $ 3,597,932 $ 2,016,298
Less: Amounts included in the cost of qualifying assets        
Inventories related to real estate business (35,713) (1,194) (11,648) (190,137)
Property, plant and equipment (77,715) (2,598) (50,309) (51,262)
Investment properties     (89) (13)
Interest expense 4,186,855 139,982 3,535,886 1,774,886
Other finance costs 16,540 553 32,355 24,608
Finance costs $ 4,203,395 $ 140,535 $ 3,568,241 $ 1,799,494