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Profit Before Income Tax - Summary of Finance Costs (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2018
TWD ($)
Dec. 31, 2017
TWD ($)
Dec. 31, 2016
TWD ($)
Analysis of income and expense [abstract]        
Total interest expense for financial liabilities measured at amortized cost $ 117,541 $ 3,597,932 $ 2,016,298 $ 2,510,197
Less: Amounts included in the cost of qualifying assets        
Inventories related to real estate business (381) (11,648) (190,137) (238,469)
Property, plant and equipment (1,643) (50,309) (51,262) (54,191)
Investment properties (3) (89) (13)  
Interest expense 115,514 3,535,886 1,774,886 2,217,537
Other finance costs 1,057 32,355 24,608 43,538
Finance costs $ 116,571 $ 3,568,241 $ 1,799,494 $ 2,261,075